bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Measuring Velocity Based on Double-Signal System
Authors: Song Yao , Ma Yan Heng , Shi Lin , Yin Yuan Wei , Fan Zhen Qin
Published: August 2013

The step-frequency wave is widely applied in high-resolution radars, while serious range-velocity coupling exists in the process. During measuring velocity, present methods’ shortages become more and more sharp. This paper focus on a kind system of measuring velocity different from those, which is based on step-frequency waves and pulse with constant carrier frequency. The advantages of single systems have been extracted in this system, so that the high precision of measuring velocity is get while the range of measuring velocity guaranteed, and well noise immunity is tested by simulations, which offers profitable reference.
A New Rotor Fault Diagnosis Method Based on EEMD Sample Entropy and Grey Relation Degree
Authors: Zhang Wen Bin , Zhou Yan Jie , Zhu Jia Xing , Pu Ya Song
Published: August 2013

In this paper, a new rotor fault diagnosis method was proposed based on rank-order morphological filter, ensemble empirical mode decomposition (EEMD), sample entropy and grey relation degree. Firstly, the sampled data was de-noised by rank-order morphological filter. Secondly, the de-noised signal was decomposed into a finite number of stationary intrinsic mode functions (IMFs). Thirdly, some IMFs containing the most dominant fault information were calculated the sample entropy for four rotor conditions. Finally, the grey relation degree between the symptom set and standard fault set was calculated as the identification evidence for fault diagnosis. The practical results show that this method is quite effective in rotor fault diagnosis. Its suitable for on-line monitoring and diagnosis of rotating machinery.
Research on Access Control Method of Automatic Test System Based on Access View
Authors: Yao Yun Zhi , Meng Chen , Wang Cheng , Tian Zai Ke , Feng De Long
Published: August 2013

This paper studies on access control method for automatic test system (ATS) based on access view. The access view of access object is proposed according to the division of test stage, subset and manipulation to units under test (UUTs). Matrix is used to describe the access view and version control is applied for access view. This method provides access control in finer grit.
Design of Vehicle Diagnostic Communication Module Based on AUTOSAR Software Architecture
Authors: Cheng An Yu , Shen Shuai , Zhao Tian
Published: August 2013

In order to solve the problem that vehicle diagnostic system is of bad uniformity and versatility, which due to the different vehicle diagnostic system communication protocols developed by the different vehicle OEMs according to their own needs, this paper proposes a design method of vehicle CAN bus diagnostic communication module based on AUTOSAR standard. This module follow the AUTOSAR standard and it can be implemented in accordance with the international standard ISO 15765. The results of the test show that when this module is applied to some car dashboard, it can satisfy the needs of the vehicle diagnostic communication system, and it is of good standardization, versatility and portability.
Time-Varying LQG Control for Vibration of Coupled Vehicle-Bridge System
Authors: Song Gang
Published: August 2013

Time-varying linear quadratic Gaussian (LQG) control for vibration of coupled vehicle-bridge system is studied. The vehicle is modeled as a moving mass model with three degrees of freedom, which consists of vehicle body, bogie and wheel. Active suspensions are adopted for the primary and secondary ones, and the control forces are produced by two actuators placed between the bogie and wheel, and between the vehicle body and the bogie, respectively. Vehicle-bridge coupling systems are time-dependent, which lead to the time-varying Riccati differential equation and the time-varying Kalman-Bucy filter equation in the LQG controller design. However, both of them are solved precisely via precise integration method and symplectic conservative perturbation method. In the example, the time history responses of the bridge and the vehicle were calculated respectively for the vehicle with passive suspensions or with active suspensions. Numerical results show that with active suspensions adopted, ride comfort can be improved when the vehicles passing through the bridge.
Research on Modeling and Simulation of Expert_PID Controlled Servo System Based on MATLAB/S-Function
Authors: Kang Fei , Liang Yan Bing
Published: August 2013

The paper elaborates Expert_PID controller applied in servo system. Illustrates an S-function construction method on complex control law. Designs an Expert_PID controller based on MATLAB/S-function and writes partial core code of Expert_PID controller. Establishes the simulink model of servo system based on Expert_PID control law, gets the simulation result. Compared with the traditional discrete PID control law, the result demonstrates that Expert_PID controller can obtain excellent control qulity.
Research on Intelligent Borehole-Surface Electrical Method Multi-Parameters Detection System
Authors: Jia Zheng Sen , Lin Jun , Li Xue Tao , Shao Lei
Published: August 2013

Accurate detection of the direction of hydraulic fracturing cracks in the oil field is one of the crucial factors in rational exploitation of the remaining oil and enhanced oil recovery. In this paper, using the potential and the potential gradient test methods and virtual instrument technology, we design and develop an intelligent borehole-surface electrical method multi-parameters detection system (BEMDS), which can achieve multi-channel, multi-parameter and high-precision borehole-surface electrical method data acquisition. Joint programming technology of Labview and Matlab gains the simultaneously measurement of the parameters of resistivity and induced polarization. As a result, the drawbacks of the original instrument that measuring single parameters and cannot mutually authenticate has been overcome.
Design and Implementation of Intelligent Vehicle Control System Based on Camera Sensor
Authors: Deb Das Shubra , Yang Jue , Chowdhury Muktadir Rahman , Ah Kioon Mary Cindy
Published: August 2013

In this paper we propose a intelligent vehicle system design with MK60N512VMD100 as the micro-controller unit and CMOS image sensor to obtain image information of the track. Our proposed comparator circuit instead of an A/D conversion to obtain the binary image enables us to achieve a bigger field of view and a higher processing speed. A unique algorithm to extract track information and to successfully extract the black guide line is devised. We also design a PID closed-loop control to adjust the rotate speed of driving electromotor and direction of steering electromotor. The results indicate that our design proposal is feasible. The intelligent vehicle could successfully achieve a high speed, while maintaining an excellent stability.
A Probabilistic Based Redundancy Control Algorithm for Wireless Sensor Network
Authors: Wang Hai Tao , Li Jian Zhou , Li Yan , Zhang Xue Ping , Chen Hui
Published: August 2013

Existing redundancy control algorithms in WSN often have some evident shortcomings such as hypothesis is too much, application backgrounds are not clear, the precision of redundancy control is low and computing complexity is high. In this paper a probabilistic based redundancy control algorithm (PBRCA) is proposed. Aiming at specific application scenarios, PBRCA introduces the probabilistic estimation theory, taking uncertainty in reasonable range as cost to determine redundant nodes in network and allow as many redundant nodes as possible to sleep. This algorithm requires fewer assumed conditions and less computational complexity as well as high flexibility. In addition, it can adapt to various redundancy control requirements of WSN with different network scales and node densities. Simulation results show that, PBRCA can control network topology node redundancy effectively with little cost and improve network efficiency.
A Displacement Measurement System Based on Artificial Compound-Eye Imaging for 2½D Space
Authors: Xie Zhan Gong , Tang Guan Rong , Jin Jian , Di Si
Published: August 2013

Comparing to the single aperture imaging system, Artificial Compound-Eye (ACE) imaging system has some nice features, such as small size and stereo vision. Based on the pictures captured by ACE, the displacement of an object can be easily deduced. This paper introduces our multiple-focus ACE imaging system. The system mainly consists of (a) a micro-lens array fabricated by Micro-Electro-Mechanical-System (MEMS) technology, (b) a CMOS chip, (c) a 3D mechanical moving stage, and (d) a software module. It can measure the displacements of an object in 212D space without calibration. The experiment validation is included.
Greenhouse Monitoring and Control System Based on Zigbee
Authors: Zhou Jian Jun , Wang Xiao Fang , Wang Xiu , Zou Wei , Cai Ji Chen
Published: August 2013

A greenhouse monitoring and control system based on Zigbee networks was developed. This system consists of greenhouse data acquisition controller and greenhouse remote monitoring and control software. The system could monitor temperature and humidity, soil water content and concentration of carbon dioxide in greenhouse and could save these greenhouse data to database. Greenhouse acquisition controller had two kinds of control modes, including local manual control mode and remote wireless control mode in monitoring center. Greenhouse remote monitoring and control software can collect, display and record the collected data, also can control greenhouse environment. According to the current indoor temperature, the target temperature and the offset temperature, PID control method is used for temperature control in greenhouse. The system is implemented using low power wireless components, and easy to be installed. A good wireless solution is provided by this system for centralized management of the greenhouse group.
Optimal Energy-Effective Gait for Biped Robot
Authors: Yuan Li Peng , Yuan Li Ming , Lu Hong Ying
Published: August 2013

Although peoples legs are capable of a broad range of muscle-use and gait patterns, they generally prefer just two, walking and running. A popular hypothesis regarding legged locomotion is that humans and other large animals walk and run in a manner that minimizes the metabolic energy expenditure for locomotion. Here, a mathematical model for a simple two-dimensional planar kneed walker with point feet and two bended knees is discussed. An energy-effective gait is designed by using piecewise torque method. Then, the robot model can exhibit a natural and reasonable walk on a level ground. The results can prove that the proposed optimal energy-effective gait is suitable for this kneed biped walking robot. And we also discover some walking rules maybe true through the results of optimization.
Design of Exhaust Temperature Test System of a Certain Type Aeroengine
Authors: Li Xiao Ming , Feng Zhi Shu , Zhang Kuo , Cai Zhong Chun , Xie Bin
Published: August 2013

An exhaust temperature test system is developed for resolving the problem that the exhaust temperature of a certain type aeroengine can not be real time monitored. The exhaust temperature test and temperature compensation circuit are designed and data collecting, processing and displaying program are written in this system which utilizes PC104 built-in industry computer as its core controller. The exhaust temperature of aeroengine can be real time monitored during test-drive by ground guarantee staff, which can help them to judge the condition of the aeroengine.
Local Mean Decomposition Combined with SVD and Application in Telemetry Vibration Signal Processing
Authors: Li Zhen Xing , Dai Wei Xiao
Published: August 2013

To suppress the noise effect on the performance of local mean decomposition (LMD) in signal processing, a new method combined with singular value decomposition (SVD) denosing was proposed in this work. SVD is applied to denoise the observed signal, and then the signal decompose to series product functions (PF) by LMD, meanwhile, SVD is applied to denoise the PF and sum the PF to LMD again. This method can suppress the noise effect to attain high precision PF for time-frequency analysis. Simulation signal and telemetry vibration signal processing results show the effectiveness of the method.
The Design of Sound and Light Controlled Corridor LED Lamp Based on Double Integration Detection
Authors: Cui Xiu Lei , Jin Yong Gao
Published: August 2013

The design of a high-sensitivity LED lamp with low standby consumption, sound and light controlled type based on the micro-power consumption characteristic of MK6A12P is presented in this paper. The standby power consumption is less than 0.07W. And the problem of the light sense unit influenced by the change of the supply voltage is solved by the design of double integration detection circuit, thereby, the detection accuracy of brightness is improved. The service life of LED lamp is greatly prolonged with constant current drive. It is proved by the experiment that the LED lamp has the advantages of simple circuit structure, high operation stability and high cost performance.
Parameter Estimation of Wideband Cyclostationary Sources Based on Uni-Vector-Sensor
Authors: Li Jun , Song Nuan , Xu Shuang , Xu Xiang Nan
Published: August 2013

Based on uni-vector-sensor, a new algorithm was proposed for two-dimension (2-D) direction of arrival (DOA) and polarization of the wideband cyclostationary sources embedded in colored noise. By sufficiently utilizing the cyclostationarity of the signals, the proposed method not only performed signal selective DOA, but also suppressed additive colored noise and wideband interference. The signal detection capability is significantly improved. Simulations illustrate the efficacy of the algorithm.
The Application of Fault Injection Using Circuit Simulation in Testability Verification
Authors: Yin Yuan Wei , Shang Chao Xuan , Ma Yan Heng , Li Gang
Published: August 2013

The fault injection technology is an important aspect in testability verification, because the actual fault injection in equipment can damage itself, so using circuit simulation fault injection method to instead. Research on the simulation method that based on PSPICE, using VC++ software to design a simulated fault injection system, its structure and function to achieve workflow introduced. Finally, taking a circuit for example uses the system to fault injection and analysis to prove the availability and correctness of the system.
Study on the Bearing Capacity of Slime Friction Pile Based on the Double-Sheared Theory
Authors: Wang Xiang Qiu , Yang Wen Tao
Published: August 2013

The bearing capacity of slime friction pile based on the Mohr-Coulombs strength criterion couldnt make full use of the potential strengths ability of rock-soil. But the double shear unified strength theory can depict really the bearing characteristics of rock-soil because it can consider the effect of intermediate principal stress comprehensively. On this condition, based on the Mindlins displacement solution and the double shear unified strength theory, a calculated formula of bearing capacity was proposed for the slime friction pile, and then the distribution regularities of lateral friction-resistance force for the slime friction pile were discussed.
Deformation Failure Analysis and Stability Control Technology of Large Section Soft Rock Chamber in Deep Coal Mine
Authors: An Chang Hui , Zhang Gui Bin , Liu Zhi Da , Zhao Kai , Guo Wei , Liu Hai Lin
Published: August 2013

The chambers of certain coal mine in Shandong such as central substation situate in soft rock which consists of mudstone and fine sandstone, etc. Obvious ground pressure behaviors, large deformation and failure of surrounding rock have serious effect on mine safety production, with the impact of various complicated deep large ground pressure. This paper presents a rational scheme to control the surrounding rock steadily, based on analysis of deformation and failure on large section soft rock chamber, combined with the concept of the" combined supporting technology of long and short anchors" and "the combined supporting technology of three anchors".
North China Lower Coal Surrounding Rock Failure Characteristics Study Based on FLAC3D and Fiber Bragg Grating
Authors: Liu Zai Bin
Published: August 2013

In order to study north China type coal field lower coal surrounding rock failure characteristics, a numerical model was built based on the numerical simulation software FLAC3D. Water inrush information was monitored during mining process based on optical fiber Bragg grating sensor technology. Lower coal surrounding failure characteristics were studied according to numerical simulation and monitoring results. This study show that the first weighting distance of the test face is from 35m to 40m and the periodic weighting step distance is from 10m to 20m. Coal floor can be divided to three areas which are increased stress area, decreased stress area and recovery stress area. Coal roof failure scope is like a composition of two saddle-shaped zones along trend and tendency directions. Normal failure depth of the test face floor is from 10m to 12.5m, and it can reach 22.5m near open-off cut and stop line. The research can explain the reason of the test faces water inrush accident and can direct lower coal mine water control work.
Study on the Rockmass Instability of Open-Pit Mine by Block Theory and Numerical Simulation Methods
Authors: Li Hai Gang , Yang Zhi Jun , Han Tong Lin
Published: August 2013

On the background of rock masses and field engineering geology of a mine, the feature of rock mechanics and rock mass structure of surrounding rock at mining district are analyzed. Based on the finite difference theory and block theory, FLAC3D program (Fast Lagrangian Analysis for Continuum), rock mechanic and rock mass structure results are used to construct the finite difference mechanical model, which reflected the surrounding rock stability when mining. By the numerical simulation, the mechanical effect is studied by the process of mining and its results can be used to produce some theory and actual basis.
The Elasto-Plastic Waves of Solids with Dilatancy Effect
Authors: Guo Shao Hua
Published: August 2013

The elasto-plastic waves of solids with dilatancy effect are studied here based on the theory of standard space under physical presentation for anisotropic solids, in which a new yield function is induced, which consider both isotropic hardening and kinematic hardening. The speed equations of elasto-plastic wave in anisotropic solids are deduced, and several new and important results are obtained.
Analysis of the Results of Pile Trial for the Subsidiary High-Rise Building of the Shandong Provincial Center for Culture and Art
Authors: Wei Qiang , Yang Xiao Dong , Jiang Shi Lin
Published: August 2013

The high-rise towers and podium of the Shandong Provincial Center for Culture and Art adopt post-grouting drilling bored pile (pressure loaded pile) and compaction-under reamed bored pile (uplift pile) respectively. Based on an off-site self-balanced static-load test of the two kinds of piles, the bearing capacity, displacement, technology for pile-forming, construction period, and engineering cost are presented in detail, and the design basis for the two piles obtaining high bearing capacity on soft soil is also preliminarily put forward. The results of this study provides a design reference for the similar projects in the western new district of Jinan City.
Microscopic Features of Mudstone Based on SEM Images
Authors: Pan Liu Sheng , Zhou Ru Cheng
Published: August 2013

Microstructure features have a significant effect on the engineering properties of geomaterials. In the current study, the images of the mudstone samples were obtained using the Scanning Electron Microscopy (SEM) technique. After converted the original images into the grayscale and binary ones, the Canny edge detection technique was utilized to detect the particle edges and compute the characteristic shape parameters of the particles in the SEM images, including the eccentricity, flat circular degree, circular degree, discrete index, radius of inscribe circle. The analysis of correlation between these shape parameters was thereafter performed. All of the above processings was implemented using the MATLAB platform. It shows that some parameters, such as eccentricity and anisotropic rate, had a great correlation; and other parameters, such as perimeter and discrete index, had a good correlation; some parameters, such as anisotropic rate and area, had no correlation. The methods presented herein may be referable in investigating the structural features and deformation/failure mechanism of the mudstones in various scales.
The Microstructure Characteristic of Compacted Laterite with Acid Pollution
Authors: Huang Ying , Bo Tong Zhen , Zhang Zu Lian , Jin Ke Sheng
Published: August 2013

s. The microstructure characteristic of compacted laterite with acid contamination was researched by means of electronic microscope scanning and microstructures image analysis in which the hydrochloric acid was used as pollutant and the acid concentration and curing history of samples were taken into account. It shows that acid pollution significantly influences the microstructure of laterite in which with more acid concentration and longer pollution times, the microstructure images behave lower compaction, blur particle edges, dissolution cement among particles, gluing coatings parceling particles, pores among particles and darker gray color. The corresponding parameters of the microstructure behave different properties in which with longer pollution times of samples, there is a maximum of porosity, girths of particles increase, number of particles decreases, the circularity of particles is not obvious, the directionality and the fractal dimension vary with magnification of the images and with more acid concentration, the girths and porosity increase, the circularity and fractal dimension decrease, the particle number and the directionality vary with the magnification of images. The result shows that the mechanism of the effect of acid contamination on laterites micro structures is that the acid erodes its particles and the cement among particles.
Susceptibility Forecast of Geo-Hazard under the Conditions of Earthquake and Rainfall
Authors: Tian Shu Jun , Kong Ji Ming
Published: August 2013

Large amount of loose deposits and potential geo-hazards were formed by Wenchuan earthquake, which would be transformed into collapses, landslide and debris flows under the condition of rainfall or aftershock. The paper divides influence factors into triggering factors and background factors, and constitutes susceptibility forecast system for geo-hazard based on factors in parallel or series. The background system contains stratum, distance to river, relief, slope and aspect of slope. And the triggering system includes distance to seismic fault and rainfall. The paper applies and verifies the system to forecast the susceptibility of geo-hazard in study area, and the result shows that 52 small watersheds are in extremely high and high states accounting for 37.68% in 138 small watersheds. According to the statistics of 23 geo-hazards from field investigation, 13 geo-hazards are in extremely high risk grade of susceptibility and 10 geo-hazards are in high risk grade of susceptibility, which shows that the result of susceptibility forecast of geo-hazard is reasonable.
Exploration of Determining the Bearing Capacity of Calcareous Concretion Soil with Static Cone Penetration
Authors: Yang Yuan Jie , Wu Dao Xiang , Li Li , Zhang Gong , Hua Ren Bing
Published: August 2013

Cohesive soil containing calcareous nodule in Huaibei plain is a kind of regional special soil, which has a unique material composition and structure. The paper discusses the types and distribution of calcareous concretion in soil, and the influence on the strength of soil and the engineering property. Through a lot of the load test and the corresponding static cone penetration test, analyzing the correlation between them.Then linear regression equation between and is established. Finally, it is show that linear regression effect is remarkable, and the equation can be reference for the local practical engineering
Discussion about Gold Ores Mineralization of Collision-Type Orogeny in the East of Shandong
Authors: Li Hong Kui , Li Yi Fan , Li Lu Yi , Zhuo Chuan Yuan , Geng Ke , Liang Tai Tao
Published: August 2013

The mineralization of collision orogeny is an important part of continental dynamics. For the process of continental dynamics of Shandong, adoption of tectonic facies mapping is main carrier and specific expression form to these researches such as divergence of continental mass, convergence, collision and orogeny. Shandong tectonic facies mapping of 1:500000 scale worked out by author shows that there are two very important events of collision orogeny in Mesozoic this areaIndochina and Yanshan collision orogeny. The Indochina orogeny is mainly characterized as subduction from Yangtze to North China Plates, based on which Sulu high-ultra high pressure zone of metamorphism, syn-orogenic granite and post-orogenic high alkali sinaite are formed. Continental dynamics environment of the Yanshan orogeny derives from transformation from Central Asia-Tethys tectonic domain to marginal-Pacific tectonic domain and subduction of Pacific plates, and it appears as three orogenys and three stretching in the east of Shandong. Magmatic rocks of orogeny related with gold ores can be divided into four combinations as follows: Linglong gneissic granite of the early orogenic period (J3), Guojialing granodiorite-granite of the middle orogenic period (K1), Weideshan diorite-granodiorite-granite of the late orogenic period (K1) and A-type Laoshan geode parlkaline alkali granitesyenogranite of the post orogenic period. For combination of Guojialing granodiorite-granite of the middle orogenic period, SHRIMP U-Pb ages concentrate in 130~126Ma, which are closely related with emplacement of gold ores, and formed ages of gold ores this area concentrate in 115~120Ma, which basically stand for the age of main mineralization period. Polymetallic ores are related with combination of Weideshan diorite-granodiorite-granite of the late orogenic period, and it was also the superimposed mineralization period in the east of Shandong. Tectonics-magma activities and gold ores mineralization are controlled by interaction of three tectonic domains that are tethys, Paleo-Asian Ocean and Pacific. Dynamics background of gold ores this area is transition of tectonic system and lithospheric thinning in Mesozoic, which is related with collision of North China and Yangtze Plates and subduction of Pacific Plates.
Analysis of Initial Stress-Strain State’s Influence on the Collapse of Tunnels
Authors: Chu Cheng , Zhao Yue Tang , Li Zhen Hui
Published: August 2013

Numerical simulations of rock-buried tunnel collapse under plane pulse loads propagated from ground were performed using the nonlinear FEM software of LS-DYNA, the difference of structure collapse between the cases with initial stress-strain conditions being concerned and not concerned was observed. The calculations indicate that, provided other conditions are equal, when initial state is taken into account the collapse is more serious than that regardless of initial conditions. Initial stress-strain state has much influence on the underground structure’s dynamic response, hence the initial conditions should not be ignored when doing dynamic analysis of underground structures.
The Crushing Mode and the Optimal Penetration of Two Disc Cutters Cutting Marble under Different Confining Stress
Authors: Shen Bin , Xia Yi Min , Gu Jian Jian , Tian Yan Chao
Published: August 2013

According to the actual working condition of the full face hard rock tunnel boring machine (TBM), a 2-D discrete element model for breaking marble by two TBM disc cutters is established, it simulates the whole progress of cracks production and propagation under different confining stress and penetration; based on CSM prediction model, forces of two cutters and specific energy consumptions are calculated to determine the best penetration. The simulating result shows that there are three kinds of breaking modes of marble under different confining stress and penetration; As well as the trend that specific energy consumption decrease first and then increase with the penetration increases, and there is optimal penetration to make specific energy consumption the lowest each confining stress. The optimal penetration and the lowest specific energy consumption are determined when confining stress range from 0 to 40MPa according to the simulation results.
Experimental Study on Kilometer-Deep Shaft Working Face Advancing Step and Mining-Induced Stress Distribution Law
Authors: Ma Chang Qing , Dai Bao Qing , Qin Guang Peng
Published: August 2013

Based on the engineering background of Tangkou in Shandong province, this thesis carries out mining-induced stress distribution law comparative study and analysis of 2313 working face which is lying below-1100 miles, using methods of theoretical analysis, numerical simulation and field measurement, and obtains the limited synergistic effect of mining-induced stress variation and working face advancing steps under the condition of kilometer-deep shaft. That is, with the increase of working face advancing steps, there will be a corresponding increase in the advanced abutment pressure peak, sphere of influence, and the distance from the peak position to the coal wall, within its limit value. The conclusion of this study have some guidance for the safe production and support design of working face in kilometer-deep shaft.
Shaking Table Test to Underground Structures in Layered Foundation
Authors: Sun Wei Feng , Jing Li Ping , Zou Yan , Yang Ning Bo , Li Yong Qiang
Published: August 2013

A three-story underground structure shaking table test had been carried on to study the earthquake damage mechanism of underground structure in layered foundation. The test model was similar to typical subway station according to a certain similarity ratio, and the soils were disturbed sandy soil and silty clay dug from the site of Harbin subway. Shaking table tests to this typical model in silty clay and alternating layers of clay and sand were performed to reveal the effect of different layered soils. Results show that the sandy soil layer can reduce the damage of the soil and underground structure, the damage of underground structure is mainly controlled by displacement of the surrounding soil, and the response of shallow buried underground structure is larger than deep buried.
Deformation Characteristics Research on Gravel Bed for Deep Buried Immerse Tunnel
Authors: Wang Yong , Sun Cai Hong
Published: August 2013

Taking some deep buried immerse tunnel as background, deformation characteristics of foundation gravel bed is discussed by physical model test. The results show that small particle size gradation is not suitable for the foundation gravel bed, and compared with the non-groove gravel, compression modulus is greatly reduced in case of gravel with groove, and in case of pile foundation, gravel crushing phenomenon is obvious at the end of loading, and the ultimate bearing capacity of gravel bed is about 480kPa. If pile and gravel bed are used as the immerse tunnel foundation plan, it needs to take measure to control the stress level under the ultimate bearing capacity of gravel bed.
Gross Error Elimination and Index Determination of Shearing Strength Parameters in Triaxial Test
Authors: Wei Fang
Published: August 2013

In order to determine shearing strength parameters of triaxial tests(cohesion and friction angle), nonlinear programming solution was suggested based on “minimum square sum of distance”. After proving that the vertical distances between Mohr circles and the regressed strength line are distributed normally, data with gross error would be excluded; moreover, the only strength line, as well as cohesion and friction angle, could be determined. Combining with Matlab, the solution process became rapid, precise and intuitive. Some examples verified the applicability of suggested method finally.
Application of Carbon Fiber Cloth in Reinforcement of Metro Tunnel Disease
Authors: Li Yu Jie , Xu Hui Jie , Zhang Yuan , Yao Juan Juan
Published: August 2013

It is study about crack diseases on tunnel lining of BEI JING metro, which is build by mining method. To begin with, the design information, the neighboring environment and the base characteristic of the tunnel is investigated. Meanwhile, the nondestructive test is working on the tunnel lining. On the basis of understanding all the disease forms, the reinforcing measure on tunnel lining is specifically formulated. This article mainly introduce the advantages and technical indicators of carbon fiber cloth, and the detailed construction technology of carbon fiber cloth in reinforcement of metro tunnel disease, that caused by local lining structure strength is not sufficient. This introduced reinforcement measures, which uses carbon fiber cloth in metro diseases could guide in the same engineering.
Prediction on Ground Surface Settlement Caused by Subway Shield Construction in Xi'an
Authors: Liu Rong Di , Zheng Jian Guo , Zhang Kai , Li Zhi Yuan
Published: August 2013

In order to study the ground surface settlement induced by shield tunneling, on the background of Xi'an metro line 2, this paper made use of the measured ground surface settlement to conduct characteristic parameters fitting of the settlement trough by Peck formula and the modified stiffness approach, proposed the initial suggestive value of the relevant calculation parameters, predicted the ground surface settlement by the formula with the determined parameters and compared the settlement with the actual settlement observation. The results show that the determination of the parameters is basicly right, the revised formula can be used to forecast ground surface settlement of Xi'an subway construction and finally a modified prediction formula is given.
Study on Excavation Procedure of Dawangou Shallow Tunnel under Unsymmetrical Pressure
Authors: Xu Su Chao , Liu T. Y. , Jin C.Y.
Published: August 2013

The performance of a tunnel is influenced by such factors as the size and shape of the opening, the in-situ stress and the deformation field and also properties of the rock mass. Different excavation procedures have great important influence on the stability of the surrounding rock, especially for tunnels under unsymmetrical pressure. In this paper, flac3D is used in the simulation of different excavation sequence for Dawanggou tunnel in order to analyze the variation of plastic zones and deformation of the surrounding rock. The numerical results indicate that the mechanical index is different due to variant excavation plans and an optimized plan is determined based on the comprehensive analysis of the index gained from the simulation results.
Study on Fluid-Structure Interaction Based on Hard Rock Deterioration Theory
Authors: Jin Chang Yu , Liu Dong , Xiang Chun Fu , Wang Yu Dong , Zhang Jian , Ren Jin Lai
Published: August 2013

Based on the fluid-structure interaction theory, FLAC3D was adopted to conduct a numerical simulation on the excavation of hong shigou hard rock tunnel. The basic mechanical properties for rock mass changed significantly during the process of secondary stress adjustments, and the rock deterioration constitutive model (RDM) can accurately reflect both the abruptness of the rock yield failure and the changes of mechanical parameters after yield. On the basis of RDM, the permeability coefficient with equivalent plastic strain function was introduced which can update the permeability coefficient. The results showed that both the surrounding rock displacement and the volume of plastic zone increased significantly because of the seepage action. Therefore, the seepage of fissure water on the hard rock should be fully considered during excavating and supporting in order to prevent accidents such as water inrush and sudden collapse.
Application and Study of C80 High Performance Concrete in Freezing Shaft Sinking Techniques
Authors: Wang Qian , Lu Tong Wei , Guo Lei
Published: August 2013

A study on C80 high performance concrete used in deep freezing mine shaft liner is made. Test results are listed as follows: (1) Concretes compressive strength at 1 day is 53.0 MPa, while the compressive strength at 28 days is 93.5 MPa. (2) The diffusion coefficient of chloride ion at 28 days is 9.8×10-14m2/s, and freezing-thawing cycle is over 1000 times. The evidence above proves that this concrete can satisfy the requirements of C80 high performance concrete used in freezing shaft sinking techniques.
Influence of Soft Rock Factor and Time Dependence in Deep Tunnel
Authors: Chen Yan , Zhang Xiao Chun , Wang Hua Rong , Zhang Nan Tong
Published: August 2013

With the development of highway tunnel engineering, the stability of the tunnel become the chief problem in designing and constructing. Tunnel surrounding rock under high stress based on the actual engineering background, model test process of excavation in soft rock tunnels under the distribution factors was finished in triaxial test mechine. Through sensor test, the whole process of tunnel became instable was reflected, and the different conditions of the change rule of surrounding rock stress was budgeted and analysed. the numerical simulation method was used to study dependency of deep tunnel with soft rock in it and the lining deformation time. in which nonlinear Drucker-Prager plastic coupling and creep constitutive model were used to describe the nonlinear viscous-elastic-plastic properties of high stress soft rock. The characteristies of tunnel lining deformation and internal force variation were studied with the above model. Soft rock thickness, soft rock tunnel location effect on inner force and deformation of the structure were discussed. The results have reference value in evaluation of long-term stability of deep tunnel.
Study and Application of Slope Displacement Back Analysis Based on SVM-CTS
Authors: Xu Fei , Huang Bo Qin , Wang Ke
Published: August 2013

A new method of displacement back analysis, named SVM-CTS, was proposed based on support vector machine (SVM) and continuous tabu search (CTS). On the one hand, SVM-CTS used SVM to build the nonlinear mapping relationship between the measuring point displacements and rock and soil mechanics parameters of positive analysis based on the study samples. On the other hand, SVM-CTS used the global optimization performance of CTS to catch the optimal rock and soil mechanics parameters in the global space. The nonlinear mapping relationship built by SVM can fit and forecast the measuring point displacements under different parameters with high accuracy. CTS can prevent object function from trapping in local optimum and improve precision of back analysis. Case study shows that SVM-CTS can be well applied to the displacement back analysis in geotechnical engineering.
Study on Seepage Field of Artificial Water Curtains for Underground Petroleum Storage Caverns in Fractured Rock Mass
Authors: Zhang Yun Peng , Yu Song , Zhu Wei Shen
Published: August 2013

Based on joint statistics from the in-situ survey, using numerical simulation technique of joint network (Monte-Carlo method), the calculation model of fractured rock mass is generated. Underground seepage discharge filed in fractured rock mass surrounding storage caverns is analyzed by using distinct element method. The result of simulation has shown good agreement with surveying data. Two cases have been simulated that is water curtains is installed and is not installed. Water pressure distributions in joints are investigated in these two cases. It is shown that in the case without water curtain the groundwater in joints which locate the upper of underground caverns is drained out and water sealed conditions is completely unrealized. When water curtain pressure is set at 0.3MPa, can underground water seal the storage caverns.
Tunnel Karst Disease Risk Estimation by Advance Geological Forecast
Authors: Liu Zhi Guo , Qiao Dong Hua , Li Yue Wei , Xu Jiang Ye
Published: August 2013

The concept of "tunnel karst disease risk estimation" is put forward for the first time, which is applied in advance geological forecast of Shajinjie tunnel. This method can help us recognizing the main hole advanced prediction work to improve the forecast work pertinence. In the forecast method, it takes the head in integrating the surface high-density electrical method with the georadar method, which improves the forecast accuracy of serious karst disease. The actual excavation results show that the advance geological forecast results meet the actual situation highly.
The Study on Infilled Walls Effect in RC Frame Infilled Wall Structure
Authors: Meng Qing Li , Chu Chun Yu , Chen Jun
Published: August 2013

The seismic damage and even collapse of the infilled walls in RC frame infilled wall structure is the issue that needs thorough study, In this paper, firstly introduces the improved infilled wall model which can consider the interaction of in-plane and out-of-plane, and can judge the damage state of infilled walls, as well as the interaction between RC frame and infilled walls. Then, based on the finite element software OpenSees, under rare earthquake, performed the nonlinear numerical simulation of two finite element models-RC frame without infilled walls and RC frame with infilled walls, comparative analysis differences of both plastic hinge zone’s steel strain, drift and acceleration response, and in-depth study of the infilled walls effect in RC frame infilled wall structure and reason analysis.
Container Crane Seismic Isolation Device Design Method Based on Structural Dynamics
Authors: Zheng Pei
Published: August 2013

Based on container cranes seismic load calculation criteria with structural dynamics and damage modes of container crane under earthquake, the seismic isolation device of this over-span flexible structure and its associated parameters selection were investigated. Taking the first crane equipped with isolating device as an example, through dynamic analysis and simulating to crane flexible system with isolation device under the earthquake, efforts was made to research for suitable isolation device and design method for port crane. The calculation and analysis in the present study could provide a new way for the container cranes isolation device design and assessment of the structural anti-seismic effect
Seismic Response Analysis of Railway Continuous Curved Rigid Frame Bridges
Authors: Suo Wen Jia , Zhu Bing , Zhao Ning , Wang Fan , Dou Sheng Tan
Published: August 2013

To study the effects of seismic waves directions on bridges, the time history analytic method was used. Two bridge types, the railway continuous curved rigid frame bridge and the railway continuous straight rigid frame bridge, have been taken into account. Both the two same span bridges were used for comparative analysis about free vibration and seismic response feature, then some practical application conclusions were obtained. The longitudinal and transversal seismic waves produce the maximum reaction values. Besides, the pier bottom sections and the beam sections at the piers top are the critical sections in the bridges. In addition, this small radius curved bridge can be designed as the straight bridge in seismic design.
Study on Seismic Performance of Unsymmetrical K-Type Friction Energy Dissipation Brace
Authors: Xu Yi Xiang , Pan Wen , Zhu Sheng Lan
Published: August 2013

The multi-storey reinforced concrete frame structure whose frame has been added with a kind of unsymmetrical K-type friction energy dissipation brace is taken as an example in this article. The time history analysis of different angles of unsymmetrical K-type friction energy dissipation brace and symmetrical K-type friction energy dissipation brace under the rare earthquake has been done by using the finite element software SAP2000. The analysis and comparison on the seismic performance shows that symmetrical K-type friction energy dissipation brace under certain conditions. Plan layout could be more flexible by using the result obtained which could become a reference for design in days to come.
Economic Evaluation and Analysis of the Isolated Structure
Authors: Gan Hong , Yang Yi Zhen , Lv Zhi Yong
Published: August 2013

Considerable economic losses caused by the earthquake, while secondary disasters such as fires caused by the earthquake, the city paralyzed, long-term social unrest, especially casualty loss can not be measured by money. Isolation technology to reduce the seismic action of the superstructure of the building, so not easy to destroy buildings in the earthquake, the direct and indirect economic losses greatly reduced after the earthquake. But also can greatly reduce the loss to society.
Study on Similarity of Hysteretic Loops and Characteristic Parameters of Viscoelastic Dampers with Test Verifications
Authors: Zhou Ying , Gong Shun Ming , Lu Xi Lin
Published: August 2013

There are similarity relations in hysteretic loops and parameters of viscoelastic (VE) dampers with same material but various sizes. Similarity coefficients of damper force and deformation of hysteretic loops were derived, and then similarity coefficients of characteristic parameters of VE dampers with various sizes were obtained consequently. Based on the similarity criteria, if the hysteretic loops of one of a series of VE dampers with same material but various sizes are obtained through test, then hysteretic loops of other dampers can be derived easily. Two kinds of VE dampers with different sizes have been tested under various strains to verify the proposed similarity criteria. The similarity criteria can be used in design of related tests and structural seismic design.
Research of Multi-Movement Parameters Iterative Control of Multi-Degrees-of-Freedom Earthquake Simulation
Authors: Tian Pan , Chen Zhang Wei
Published: August 2013

Acceleration iterative control is generally used in multi-degrees-of-freedom earthquake simulation test. To overcome the shortcoming of poor displacement amplitude accuracy in this control, a multi-degrees-of-freedom earthquake simulation control strategy based on multi-movement parameters iterative control is proposed. This control divide the frequency range of earthquake simulation test into displacement control area, the synthetic control area and acceleration control area from the low frequency to the high frequency, and correct the acceleration errors spectrum and displacement error spectrum by iterative control method, and produce shaker driver signal by synthesis method, and realize the displacement replication and acceleration replication at the same time. The experimental results which are got in multi-degrees-of-freedom earthquake simulation facility indicate that this control can achieve high accuracy multi-degrees-of-freedom earthquake simulation test after several times iterative.
Site 2D Velocity Structure Imaged by Microtremors Method
Authors: Shi Li Jing , Tao Xia Xin , Su Xi
Published: August 2013

In this paper, a two-step space prediction approach is developed to image site 2D velocity structures. Firstly the average Vs of each layer are fixed, the interfaces between each two soils layers are predicted by the interpolation method of bi-harmonic Green function as spline in tension, to keep soil interfaces varying smoothly in space. Furthermore, a method to determine tension coefficient is proposed based on microtremor H/V method, which makes most use of H/V information and avoids choosing the tension coefficient at will. Secondly, the variance essence of the Vs structure as a regional variable is deeply excavated by Kriging method and its structural characteristic is taken into account. The spatial successive distribution of the Vs structure between soil interfaces is simulated by high precision space extrapolation and prediction, and finally the detailed 2D model is constructed. The two-step space prediction approach describes the characteristic of Vs structure as a regional variable from the sparsely and non-uniformly distributed microtremors data. Obviously, it also can easily make good use of the other exploration data.