bluuebunny/crossref_metadata_2025 huggingface dataset:
Significant Analysis of Soft Rock Tunnel Disaster-Causing Factors Based on Orthogonal Test
Authors: Chen Jian Ping , Xu Ying , Zuo Chang Qun , Yi Yi
Published: November 2012

The impacting effect of lithological features, tectonic stress, the mechanical parameters, structure surface contrasts were comparative analysis, to explore the effect from mentioned factors to surrounding rock-lining in schist tunnel. In order to make sure the dependence relationship of large deformation with these factors, the significant and interaction on large deformation in rock-mess and lining mechanical mechanism were studied according to the experiment data and statistics theory. The result shows that elastic modulus E, side pressure coefficient λ, and joint spacing S have obvious influence on the mechanical properties of surrounding rock-lining, and there is interaction among them. Furthermore, the influence of the interaction between S and λ to rock-lining is found to be significant, and there is an obviously dependent relationship between anchor failure and joints spacing. Therefore, when discussing the reduction measures to avoid the large deformation, the most appropriate method is to study it in overall factors and with the interaction.
Several Related Factors on Highway Nondestructive Testing
Authors: He Shui Ming
Published: November 2012

Highway engineering quality is the lifeline of highway. Ground-penetrating radar is a new nondestructive testing technology of the road quality detection. This thesis takes advantage of ground-penetrating radar to analyze and discuss several related factors on highway nondestructive testing, for instance, the water content and compact degree of the base course, identification of cavity beneath the rigid pavement, and the differential settlement of the base course beneath the flexible pavement. Results of this research provide an excellent detection method for engineers and technicians.
Dynamic Response of Airport Concrete Pavement to Impact Loading
Authors: Cai Jing , Wong Louis Ngai Yuen , Yan Hua Wei
Published: November 2012

The pavement-subgrade interaction is an important issue in the concrete pavement design.The present study focuses on the analysis of the dynamic deflection and the velocity response of airport concrete pavements to impact loading. The pavement-subgrade interaction is simplified as a linear viscoelastic model, in which the subgrade is composed of two layers (a base layer and a soil layer). The subgrade’s synthetical modulus and damping coefficient are obtained by the method of weighed mean. Through the Fourier and the Laplace transform the solution of the equilibrium equation of the pavement-subgrade system is deduced and the dynamic deflection solution of the pavement-subgrade system is obtained. In this study, an impact aircraft landing load increasing proportional to the aircraft vertical landing acceleration is considered. A Matlab program is compiled based on the solution to assess the influence of various system parameters (slab thickness h, slab size, subgrade reaction modulus Ks and subgrade damping factor C0) on the dynamic deflections of the pavement slab. The influence of h and Ks on the dynamic velocity response of the slab is also discussed. The results show that changing the damping factor and the subgrade reaction modulus has only a small influence on the deflection of the slab and the deflection, while the amplitude of velocity response and the frequency of velocity responses all decrease with the increase of the slab thickness. If the pavement slab size is decreased, the deflection at the center of the slab will decrease. A nonlinear relationship can be established between h and the maximum deflection, while linear relationships exist between C0 and the maximum deflection, as well as Ks and the maximum deflection.
The Study on Road Performance and Pavement Structure Analysis for the Base Layer Material Stabilized by SRX
Authors: Zhang Yue , Zhao Yun Long , Yu Bao Yang
Published: November 2012

In order to overcome the weakness of semi-rigidity base layer，the road performance of the SRX(Solution Road RomixSoilfix) stabilized base material and the mechanics response of asphalt pavement with the base layer stabilized by SRX have been studied in this paper. The CBR value and resilient modulus of SRX stabilized base material were given by indoor test. Based on the multiple layer elastic theory, both the mechanical responses of asphalt pavement structure with the SRX stabilized base and semi-rigid base were given, and according to the calculation results, the two kinds of pavement structure fatigue life were analyzed. The results have shown that the CBR value of SRX flexible material is greater than that of graded crushed stone; the SRX stable material can be used as pavement base layer, but the fatigue performance of SRX flexible base materials should be paid much attention.
High-Grade Highway Safety Evaluation Method Based on Grey Clustering
Authors: Hu Sheng Neng
Published: November 2012

Evaluation for traffic safety is very important to improve traffic safety. First analyzes high grade highway security characteristic, then according to grey characteristics of traffic safety system, proposed high grade highway grey clustering evaluation model, and carries on the model to Henan province high grade highway's safe condition status evaluation, thus confirms this method the validity. The research showed that this model is a effective way which measure high grade highway transportation degree of security.
Adaptability Analysis of Preventive Maintenance Measures for Asphalt Pavement
Authors: Wang Qing Zhou , Liu Shu Yan , Liu Jing Li , Liang Yong Guang
Published: November 2012

Choose appropriate preventive maintenance measures is the key link to the pavement preventive maintenance successfully and effectively. According to the characteristics of highway asphalt pavement preventive maintenance technology, it summarizes the applicable and inapplicable occasions and application note of existing preventive maintenance measures, puts forward the preventive maintenance technology characteristics and adaptability, sets up the frame of decision-making for the preventive maintenance measures to provide guarantee for successful implementation of effective preventive maintenance.
The Application of Carbon Fiber Concrete in the Intelligent Bridge Reinforcement
Authors: Lu Rong , He Xiao Ming
Published: November 2012

The carbon fiber is applied to the bridge reinforcement as the intelligent material because of the electrocaloric effect, which can improve the bearing capacity and the deformation capacity of the bridge. This paper investigated the application of the carbon fiber concrete in the maintenance of Guan Yin Dang bridge. With the combination of the analytical and experimental methods, we can obtain the calibration coefficient for the structure. The maximum calibration coefficient of the stress at the mid-span is less than 1, and meets the requirement of the criterion. The results demonstrate that applying the carbon fiber concrete in the bridge reinforcement is an effective method, which may provide a basis for the bridge intelligence of reinforcement and health inspection.
Fine Analysis for Bursting Damage of Bottom Plates in Closure Section of Continuous Rigid Frame Bridge
Authors: Zuo Xin Dai , Ge Bin , Song Jian Yong
Published: November 2012

The author took Chuanlingdong Bridge in Fujian Province for example. Applying general FEM software ANSYS and sub modeling technique, 3D model of the whole bridge was built firstly, and then closure section and nearby sections in mid-span were built to sub model. In the sub model, initial mesh was refined, weaken effects of corrugated pipes were considered and plain bars also were built. Based on the fine sub model, original design and construction tolerances are analyzed respectively. At last spatial stresses of closure section were cleared and key influencing factors were concluded. This research showed construction tolerances had a great influence on bursting damage when the design was at a disadvantage.
Static and Dynamic Response Contrast Simulation of Long-Span Beam Bridge Subjected to Flowing Ice
Authors: Bai Zhi Ping , Zhang Xie Dong , Han Cheng Lin
Published: November 2012

According to pile-soil function and damper boundary condition influence by Finite Element Method, taking Bao-Shu yellow river extra long-span bridge as the project object, the deformation effect of the bridge subjected to flowing and melting ice in spring was analyzed considering static and dynamical action mode. The results revealed that the deformation from this kind of action is tittly small and the bridge structure is reliable and stable. Also the deformation effect of the pier from dynamic ice action is larger than static action. While for two or more piers, the results are reverse.Then the calculation and analysis have been put into design and construction stage.
Pre-Evaluation of Durability for Concrete Bridge
Authors: Zheng Xue Zhong , Lin Jian Fan
Published: November 2012

Assessment system of durability for concrete bridge was built in this paper, and the time variable was introduced in the system. Durability factors in different time were calculated and assessed, then the components and parts of concrete bridge were assessed. Assessment vectors of bridge construction in different time were calculated by combining prediction and assessment of durability. According to the assessment vectors and the asymmetric approach degree method, durability grade of concrete bridge in different time is pre-evaluated.
Status of Seismic Isolation Research on Underground Structures
Authors: Wei Qing Hai , Sun Hai Feng
Published: November 2012

It is the same to structures on the ground, there’s many ways to reduce the damage which is caused by earthquake too. Mainly, there are two measures to absorb the shock on underground structures. The method of changing performance of underground structure will make construction cost enhance greatly, and the effect of shock absorption is not obvious also. The method of setting shock absorption layer can reduce the deformation and energy of surrounding soil transmits to the underground structure. It can solve the problem which earthquake creates danger to the underground structure essentially.
The Effect of Site Condition on Ground Motion in Gansu Province during the Wenchun Ms8.0 Earthquake
Authors: Wu Zhi Jian , Wang Lan Min , Wang Ping , Shi Hang , Chen Tuo
Published: November 2012

Based on mobile strong motion array observation, borehole exploration and site seismic response analysis, the site effects of mountainous topography in southeastern Gansu and the topography of loess tableland on ground motion were investigated in details. The analysis on acceleration records of aftershocks showed that the peak ground acceleration at top of the mountain is nearly 2 times of that at the foot of it. The seismic response analysis of sites shows that the loess tableland may amplify PGA by 1.44-2.0 times. Therefore, site effects of mountains and loess topography on ground motion should been taken account into seismic design.
Experimental Study on Seismic of High-Strength Spiral Stirrups Prefabricated Column Encased by Steel Plate Hoop and Bolt Reinforcement
Authors: Zheng Xian Chao , Li Qing Ning , Pan Shu Bin , Jiang Wei Shan
Published: November 2012

The assembled monolithic compound spiral reinforced concrete column in this paper is a kind of concrete column reinforced by high-strength compound spiral stirrups and jointed by local steel tubular and bolt reinforcement. Experiments of four specimens under low cyclic loading and different axial compressive loads are carried out, and the result testifies that the anti-seismic property of these measures is not worse than the integral compound spiral hoop columns under the same load.
Study on Critical Shear Wave Velocity of Saturated Loess Foundation Soil Liquefaction under Different Seismic Magnitudes Action
Authors: Wang Ping , Wang Lan Min , Wang Qian , Wang Jun
Published: November 2012

Use of Seed’s simplified liquefaction evaluation method, combined with the dynamic triaxial test results, and the wave velocity of site liquefaction, to evaluate liquefaction potential of the three typical loess sites under the action of different seismic magnitudes, and calculate the boundary depth of the liquefaction site. Moreover, give the corresponding relationship between the typical loess site liquefaction boundary depth and shear wave velocity, and get the critical shear wave velocity of typical loess liquefaction site. The results of the study show that, (1) saturated loess site could be liquefied under the action of a certain intensity earthquake. (2) saturated soil layers which do not produce liquefied under the action of 6.5 degree earthquake，its critical shear wave velocity is about 200 m/s, and under the action of 7 degree earthquake its critical shear wave velocity is about 303 m/s, under the action of 8 degree earthquake its critical shear wave velocity is about 368 m/s. This conclusion enriches and develops the basis of liquefaction potential evaluation in the loess region.
Seismic Analysis and Comparison of Different Base Isolation Systems for a Multi-Storey RC Building with Irregularities in Plan
Authors: Cancellara Donato , de Angelis Fabio
Published: November 2012

In the present paper the dynamic nonlinear analysis for a 3D base isolated structure is illustrated. A base isolated reinforced concrete building is designed and verified according to the European seismic codes such that the superstructure remains almost completely elastic and the nonlinear elements are localized only in the base isolation system. Nonlinear hysteretic models have been adopted to reproduce the cyclic behavior of the isolators. Two different base isolation systems are considered and their performances are compared for evaluating the behaviour of a base isolated building, highly irregular in plan, in presence of a seismic excitation defined with recorded accelerograms which characterize the bi-directional ground motions. The isolation system has been realized with a combination in parallel of elastomeric bearings and sliding devices. In the first analyzed isolation system we have used the High Damping Rubber Bearings (HDRB) and in the second analyzed isolation system we have used the Lead Rubber Bearings (LRB). Finally a comparative analysis between the base isolated structure with hybrid base isolation systems and the conventional fixed base structure is detailed.
Seismic Performance Reliability Analysis of Frame Structure with Special-Shaped Columns
Authors: Liu Yang , Liu Hong Bing
Published: November 2012

The displacement response of special-shaped column frame structure on the elasto-plastic state was obtained with the Pushover method. Using Park-Ang model to calculate the damage level of each floor, and then using the improved mean response spectrum analysis method to compute the mean square response of the maximum elasto-plastic structure interlayer displacement and the probability of different damage levels. The result shows that the seismic performance of special-shaped column structure will be better reflected when the structure is analyzed with the methods mentioned above and these methods have some theoretical significance.
The Study on the Effects of Different Forms of Steel on Seismic Performance of Steel Reinforced High-Strength Concrete L-Shape Short Pier Shear Wall
Authors: Su Yi Sheng , Quan Jin Yun , Zhang Wen , Yang Yi Bin
Published: November 2012

In order to discuss how the different forms of steel impact on seismic behavior of steel reinforced high-strength concrete(SRHC) L-shape short-pier shear wall, four different steel forms SRHC L-shaped section short-pier shear wall members with low reversed cyclic loading were simulated by ABAQUS. The four steel forms were steel bar, solid-web steel, truss-type steel and hole-type steel. The result show that: different steel forms can significantly impact on the seismic performance of SRHC L-shaped section short-pier shear walls and the seismic capacity range from high to low as follow: with solid-web steel, with hole-type steel, with truss-type steel and reinforced.
Characteristic and Stability Analysis for Loess Seismic Landslide in Valley City
Authors: Nai Wang , Wang Lan Min , Yuan Zhong Xia , Qian Wang
Published: November 2012

In the light of heavy seismic landslide disasters in the valley city of loess area, 104 typical loess landslides caused by the 1654 Tianshui(Ms 8.0), 1718 Tongwei(Ms 7.5) and 1920 Haiyuan(Ms 8.5) earthquakes were studied, main landslide type and basic characteristics of seismic landslide in the valley city were analyzed. The landslides in the valley city of loess area are divided into three types: homogeneous loess landslide, loess interface landslide and loess-mudstone cutting layer landslide. Through the investigation and analysis of earthquake risk, the suggestion about the 22 dangerous landslides in Tianshui is given. The study is expected to supply scientific basis for seismic landslide disaster prevention and reduction in valley city of loess area.
New Type of Spur Dike at the Exit of Diversion Channel: Courter-Arc Vertical Ladder Spur Dike
Authors: Yue Shu Bo , Diao Ming Jun
Published: November 2012

Arranging spur dike at the exit of diversion channel significantly influences the safety of the downstream cofferdam and the scour of the downstream bed by changing the water velocity and turbulence. In order to compare the advantages of different arrangement of spur dike, detailed profiles of velocity and scouring are measured in laboratory flume. And water depths, surface velocity and the condition of downstream bed scouring are investigated at the exit of diversion channel at different arrangement. A new type of spur dike is designed, which is named as courter-arc vertical ladder spur dike. Through experiments on physical model, the new type of spur dike alters the direction of the outflow, decreases water speed and reduces downstream bed scouring and ensure high slope safety.
Analysis and Research on Dynamic Characteristics of Bulb Tubular Pumping Station Structure
Authors: Xiao Ye , Ding Xiao Tang
Published: November 2012

This paper was combined with the third Huaian pumping station to study the dynamic characteristics of the bulb tubular pumping station. By using dynamic finite element analysis method to create Huaian pumping station modes. Then using ANSYS Model Analysis and harmonic response analysis, the vibration modes and dynamic response were researched deeply. According to the mode analysis results, the fundamental frequencies of upper pump house were determined for 1.36Hz and the fundamental frequencies of substructure were determined for 20.11Hz. The dynamic response of the bulb tubular pumping station structure under fluctuating pressures is calculated by ANSYS harmonic response analysis, and the results show that dynamic displacement satisfied the maximum allowable of architectural construction permission，so it can satisfy design requirement, which provides references value for other tubular pumping station in anti-vibration design.
Dynamic Stability and Reinforcement Effect Analyses of Dagangshan High Arch Dam Abutment
Authors: Yang Qiong , Zhang Jian Hai , Shao Jing Dong , Li Man Lin
Published: November 2012

The maximum height of Dagangshan arch dam is 210m. Its geological conditions are complex. The basic seismic intensity of the dam is VIII. The crest value of earthquake acceleration that 100 years beyond the probability of 2% is 0.5575g. Using the rigid body-spring element method, this paper simulated Dagangshan arch dam’s abutment dynamic stability under earthquake action. Searching the governing sliding bodies and evaluating the reinforcement effect. The results show that under the action of earthquake, the left and right bank’s key slide blocks are L1 and R2 respectively. Before reinforcement, their minimum instantaneous dynamic safety factors dropped from 5.053 and 3.076 of static values to 1.045 and 0.922 respectively. After the pre-stressed anchor cable reinforcement on the left and right abutment, the minimum instantaneous dynamic safety factors of blocks L1, R2 are raised up to 1.091 and 1.145 respectively, meeting the requirements of designing value, the reinforcement measures are very effective.
Study on Estimating Failure Probability of Earth-Rock Dams
Authors: Sun Rui Rui , Wang Xiao Ling , Ao Xue Fei , Guo Wei Ping
Published: November 2012

Dam safety based on risk analysis methodologies demands risk quantification of the earth-rock dam project, and estimation on the failure probability of earth-rock dams is a major concern in the dam safety management. Due to numerous uncertainties, structures of the reservoir are involved leading to risks that may finally cause dam failure. The risk identification was firstly investigated according to the actual project. Subsequently, method of expertise was presented to estimate odds of the presence of each link in dam failure modes quantitatively. The reservoir composed of several dams in South China was taken as a case. The failure probabilities of each dam were obtained and results showed that risk of No.5 dam was relatively higher in all the dams. The research is of great significance to the dam safety management.
Hydraulic Experimental Study on Nonmetallic Plastic Pipeline
Authors: Liu Bao Jun , Zhang Ling , Guan Chen
Published: November 2012

Corrosion of steel pipeline can form numerous leaks, reduce service life of pipeline, and make large losses. Use of nonmetallic pipeline can solve the problem. Glass fiber reinforced plastic pipeline is nonmetallic pipeline. It can be installed conveniently, would not corrode in electrochemistry environment, and its service life is very long. So, it is widely used in many fields such as petroleum, city water supply, waste water processing, etc. In the paper, hydraulic calculations of pipeline are researched, and frictional resistance losses of water in glass fiber reinforced plastic pipelines with different diameters are measured. Based on experimental data, errors between experimental values and calculation values of formulas for hydraulic calculation are analyzed. The formulae to calculate the frictional resistance in glass fiber reinforced plastic pipeline are recommended.
The Advances in Risk Analysis of Reservoir Operation Research
Authors: Ye Yan , Ma Guang Wen , Zhang Yuan Bo
Published: November 2012

There are many uncertain factors in the process of reservoir’s operation. For the reasons, the "deterministic theory" must turn to" probability theory", and it becomes necessary to strengthen risk analysis. Summarize the connotation of reservoir risk analysis, progress in research of risk analysis for reservoir inflow forecasting, risk analysis for reservoir operation, risk analysis for flood protection and flood discharge , and reservoir multi-objective risk analysis. There are so much influence factors and much of them uncertainly, not enough research on multiple targets and multiple factors, not much apply on new risk analysis theories and methods. Therefore, it should research more on the fields of risk identification, reducing the impact of human factors, new analysis methods and coupling methods.
The Application of Three Dimensional Drainage Flexible and Ecological Reinforced Construction in High-Speed Railway Station Roadbed
Authors: Wang An Hui , He Hong Sheng
Published: November 2012

This paper introduced a new type of retaining structure in roadbed of a high-speed railway Station--Three dimensional Drainage Flexible and Ecological Reinforced Earth Retaining Wall. Both side efforts of this structure have taken into account in lope protection and environmental protection, so it can be promoted in high-speed railway construction. Its main advantages included: ecology, environment protection, simple construction method, the better adaptability to differential settlement, the better stability, and so on. This type of retaining structure mainly composed by geogrid, ecological bags, tying belts, connecting buckle, etc. In the construction should pay attention to the technical requirements of the laying of geogrid, the stacking of the eco-bags and placing of connecting buckle and so on. This paper discussed briefly of the type structure from its advantages, its compositions and its construction key points
Numerical Simulation of Hydraulic Characteristics in a Tangential Vortex Dropshaft
Authors: Jia Ren Yong , Zhang Shan Fa , Hu Long
Published: November 2012

Drop structures are commonly used to convey water from a higher to a lower elevation in different engineering domains, especially the vortex drop structure. Because of complex flow properties and construction technology, the system running security should be verified before it was built. In this paper, numerical simulation method was employed to analyze the hydraulic characteristics in a tangential vortex dropshaft. It is shown that there is a control section in dropshaft, and inhaled water at the control section should be avoided during the running and designing process. The numerical model is able to provide an insight into the hydraulic behavior at different flow size, and can be extended for other design verification in engineering.
Tests on High-Pressure Water Rotational Jetting Ventilation Cooling Characteristic
Authors: Ma Zhong Fei , Chen Li , Wang Fu Qin
Published: November 2012

In order to improve the cooling effect and practical applicability of falling temperature technique on high-temperature workplaces, the aeration and cooling principle of the high pressure water rotational jetting ventilation were analysed, and the experimental study was carried out. The results show that water pressure and cooling rate are an approximation of parabolic growth relationship, different structure of jet tube and temperature difference on water and gas also have an obvious effect on the cooling amplitude and air quantity. the guide vanes installed may improve effect of ventilation and cooling the capacity on high pressure water rotational jetting.
Research on the Simulation of Auxiliary Boiler System on Ships
Authors: Song Xin Gang , Zhang Ning , Ma Qiang
Published: November 2012

The present thesis employs VC++ program technique and digital simulation to design and develop simulation for auxiliary boiler system on ships based on PC desktop. The thesis aims to help students to grasp the operation of auxiliary boiler system expertly in connection with the restraining factors on safety and economy existing in real teaching and training. The results of analog simulation and application show that: Simulation for auxiliary boiler system on ships is capable of simulating the operation and control process of real one; it is convenient for students to master the characteristics and grasp the common faults of auxiliary boiler system; it helps to elevate students’ level of maintenance and management so that the safety operation of machines on ships can be better secured.
Application of Finite Element Method of Composite Wall Insulation System
Authors: Cheng Tao , Yan Ke Qin
Published: November 2012

In this paper, the thermal stress characteristics of polystyrene plate - thin plaster wall are present. A three-dimensional element is selected to mesh the wall model, which can simulate the coupling effects of thermal stress and structural stress field. Thermal stress and deformation distribution are proposed after comparing and analyzing the two simulation results. Numerical simulation results indicate that: (1) Polystyrene plates thin plaster wall insulation system has very good thermal insulation properties；(2) Different stress fields concentrate significantly around windows and in the middle of wall especially around the windows. (3) The deformation of the polystyrene plate - thin plaster wall insulation system reach the maximum at the edge of the wall while the minimum in central.
Numerical Simulation about the Effect Rules of Particles Concentration on Erosion of the Centrifugal Fan
Authors: Dan Mei
Published: November 2012

If the dust laden gas is cleaned by a dust separator, the rest particles become very small. Then, the fine particulate behavior looks like fluid. Therefore, particle concentration becomes one of the most important affecting factors on the impeller abrasion. It is more reasonable to simulate gas-solid two-phase flow field in the impeller of a centrifugal fan by Reynolds Stress Model and Tabakoff - Grant Erosion Model. The erosion location and rate of working surfaces of blades with different particle diameters and inlet concentration have been predicted. These results show that the erosion location has relationship with different particle diameters, and effect of particles number concentration is more important than particles mass concentration on erosion rates.
Numerical Simulation Method Ascertaining Slope Stabilization Anti-Slippery Pile's Basic Parameters
Authors: Feng Wen Juan , Ju Xiao Dong , Zou Zheng Sheng
Published: November 2012

Although anti-slide pile take a key position in slope-treating measures, the method of designing is far from perfect. The methods used in actual projects are based on the rigid body limit equilibrium methods. There is a tendency to using numerical methods in the progress of pile-designing. The safety factor of landslide is calculated according to shear strength reduction theory in the numerical simulation software. Using the shearing forces on pile and the safety factor can ascertain the position of anti-slide piles, the area and distance of piles. For numerical simulation can well perform the simulation slope moving and the load on piles and can give a more reasonable designing.
Crack Detecting and Localizing Using Distributed Optical Fiber Sensing
Authors: Lu Fei , Chen Zhong Fan , Guan Yong Sheng
Published: November 2012

One Brillouin scattering-based distributed optical fiber sensor system for monitoring cracks of a reinforced concrete column is presented. The column specimen cracked, yielded, and crashed, as the cyclic loading on the column increased, and the entire process was monitored by the sensor system. A fine crack with an initial width of 0.02mm on the column due to the loading was successfully detected, not only its initiation, but also its accurate location. The optical fiber acts as the sensing element effectively and reliably, even when the crack width was increased 10mm. The cracks distributed over the column were successfully detected, and their identified locations agreed with visual inspection results.
The Effects of Fines on Post Liquefaction Strength and Deformation Characteristics of Sand
Authors: Wang Yan Li , Wang Yong
Published: November 2012

This study has been carried out to determine how the fines content affects the post liquefaction strength and deformation characteristics of sand. With the GDS dynamic triaxial system, a series of monotonic undrained compression tests of the sand after liquefaction with variation in fines content from 0 to 40% were conducted, and effects of fines content on the post liquefaction strength and deformation characteristics of sand were analyzed. Results show that with the addition of fines up to a fines content of 30%, the stress-strain curve moves downward and axial strain at low intensive stage is increased, beyond this critical value of fines content the trend is reversed. However, shear strength of post-liquefied sand first decreases with increasing fines content, and beyond the critical value of fines content it increases with increasing fines content at the strength recovery stage when are subjected to monotonic loading. At the same time, the strength recovery rate decreases firstly and then increases with the increasing fines content.
Rock Mesoscopic Structural Plane, Mesoscopic Anisotropy and Mesoscopic Anisotropy Index
Authors: Xu Hui Ning , Xu Jin , Li Zhong Hong
Published: November 2012

In this article, we define rock structural planes caused by mineral orientation and layering distribution of some rock ingredients which is different from both rock mass scale structural planes and micro structural plane at crystal scale, as rock mesoscopic structural plane, and the rock anisotropy caused by the existence of these structural planes as rock mesoscopic anisotropy. Rock mesoscopic scale anisotropy index is introduced and its simple but efficient testing method is suggested. With the rock mesoscopic anisotropy index, the degree of rock mesoscopic anisotropy can be quantified easily and the process in simplified.
Three-Dimensional Slope Stability Analysis Methods Based on GIS Technology
Authors: Pan Xiao Dong , Yang Li Hong , Zhang Sheng Ye , Pu Wei , Sun Ming
Published: November 2012

By using imbalance thrust force method, the slope stability factor based on three-dimensional slide block was deduced. According to the borehole data of highway, the TIN data layer and grid data layer for three-dimensional slope stability analysis were carried out by use of ArcMap. The value of each gird cell of different layers are picked up as slide block, it makes convenience in the slope stability analysis. Considering the property of bedding landslide, the three-dimensional slope stability analysis program based on VBA of ArcGIS is put forward in this paper. Taking one of the large rocky landslides as an example, the results of the three-dimensional stability analysis with slope before and after excavation, as well as the different water level conditions are compared. Furthermore, the directive significance of the three-dimensional method in landslide harness engineering was discussed.
ArcGIS-Based the Dam of Three-Dimensional Modeling Technology
Authors: Huang Tao
Published: November 2012

Nowadays, with the wide application of the geographic information system in water conservancy and hydropower projects, workload of three-dimensional digital model building the dam has become very large and complicated. However, the combining development of AutoCAD and ArcGIS can greatly reduce its workload and improve the working efficiency and modeling accuracy. This paper mainly conducts a preliminary study on dam three-dimensional modeling development in water resources and hydropower projects in the application of ArcGIS, and introduces the process of CAD data transferring into GIS data based on AutoCAD and its component technology.
Design on Information Management System of Buildings Based on WebGIS
Authors: Ouyang Fang Xin , Du Xiao Chu
Published: November 2012

Many kinds of building information include spatial location factor, these spatial data can be obtained by geographical information system technology, managed and analyzed conveniently. In this paper, a design framework of information management system for building information based on WebGIS is presented, which is used for management of buildings which are completed and put into use, and the system structure, function and design method of database are expounded in detail.
Application of Fuzzy Least Squares Support Vector Machines in Landslide Deformation Prediction
Authors: Chen Wei , Xiao Xiao , Zhang Jian
Published: November 2012

Aiming at the problem that the Least Squares Support Vector Machines(LSSVM) was sensitive to noises or outliers, fuzzy idea was used to the Least Squares Support Vector Machines.The Fuzzy Least Squares Support Vector Machines(FLSSVM) was proposed and was applied to the Landslide Deformation Prediction. Experimental results show that this method can improve the accuracy of prediction and be effectively applied to landslide deformation prediction.
The Analysis Model of Coupling Heat Flux in Heavy Oil Reservoir and its Application
Authors: Chen Jian , Wang Zhi Guo , Zhang Lei , Yang Wen Zhe
Published: November 2012

There are heat-fluid-solid multi-field coupling in the thermal recovery reservoir. At present, the researches on oil reservoir porous media coupling are mostly on fluid-solid. According to the oil reservoir characteristics, this paper puts forward the “white box” analysis model on the heat and mass transfer processes in thermal recovery reservoir. On this basis, the analysis and stimulation of the various porosity effects on heat and mass transfer processes use CMG software. This result can provide theoretical basis for enhancing oil/gas recovery.
Analysis of the Instantaneous Local Thermal Equilibrium Assumption for Heat Exchange between Rock Matrix and Fracture Water
Authors: Lu Wei , Xiang Yan Yong
Published: November 2012

For theoretical modeling of water flow and heat transfer processes in fractured rocks, one of the most commonly employed assumptions is that instantaneous local thermodynamic equilibrium exists between the water, the fills in the fractures, and the surfaces of the neighboring rock matrix blocks. An analysis of the effects of such assumption is conducted through semi-analytical calculations of heat transfer in a single fracture impermeable rock. It is observed that, for the heat exchange between water and fill, the ratio of the convective coefficient and the grain size acts as the major influencing factor to the validity of the instantaneous local thermal equilibrium between water and fill, that the discrepancies caused by using the thermal equilibrium for heat exchange between rock matrix and water can be significant at locations close to the heat source and at early times of the process, but reduce rather quickly to negligible levels as the distance to the heat source and the time increase, and that the influence of the thermal equilibrium assumption also becomes less significant if the water velocity is small, if the heat capacity and conductivity of rock matrix is small and the convection coefficient is large.
A Method to Determine the Optimal Water Injection Intensity Based on Oil Production Rate and Water Cut
Authors: Zhang Ji Cheng , Jia Ying , Cui Xiao Na
Published: November 2012

Water injection is one of the important ways to maintain reservoir pressure and improving the oilfield development effect. And separate zone water injection is the main technology in water flooding oilfield. The optimal water intensity which has been allocated plays an important role in all kinds of reservoir. This paper proposed a method to optimize the water injection intensity based on oil production rate and water cut. Conceptual model was constructed on the basis of real reservoir. By numerical simulation, a chart board was derived which describes the relationship of water injection intensity versus oil production rate and water cut. Using this chart, we can determine the optimal water injection intensity on different oil production rate and water cut.
Block Element Method for Seepage/Stress Coupling in Fractured Rock Foundation of Gravity Dam
Authors: Yin De Sheng , Qing Wei Xing
Published: November 2012

The uplift pressure on the foundation surface is one of the unfavorable factors for the stability of a gravity dam. The seepage/stress coupling character in the rock foundation may make the change of the seepage field which can lead to the change of the value of uplift pressure. In this paper, the seepage/stress coupling in fractured rock masses is studied by the two fields across iterative method with the help of block element method. A gravity dam is studied and the numerical analysis results show that the normal stress can affect the seepage character of rock masses greatly. In the region of high pressure stresses, the transmissivity deduces which can bring about the increment of gradient and velocity. This will bring an adverse impact on the stability of the dam. The coupling of seepage and stress in fractured rock foundation cannot be ignored in arithmetical analysis.
Research of Short-Leg Shear Wall Structure System Function in Multiple Coupled Field
Authors: Kui Dai
Published: November 2012

Calculation of Short-leg shear walls structural system is a multi-field coupling problem. Through the research and application of short-leg shear wall structure calculation theory, based on the national codes,the short-leg shear wall design principles are established.It is discussed for the reason of the world's first short-leg shear wall structure design formation and development research. According to short-leg shear wall force characteristics, horizonal displacement is divided into destructive story drift and harmless story drift, the formula for calculating the destructive story drift is obtained, using destructive story drift angle parameters and the change of main section height to control the deformation, to control structural rigidity to ensure the structural design rational purpose.
Study on Variation Regular Pattern of Development Indexes in Beierdong Block after Layer Recombination
Authors: Qi Gui Xue , Zhang Hai Xia , Long Mian , Qin Jun , Zhang Ji Cheng
Published: November 2012

Nowadays, in China nearly all the produced oil-fields have already entered the period of high water cut, and the six oil-fields of Daqing and Shengli oil-field etc. have exceeded eighty percent water cut. Beierdong Block has produced for nearly fifty years, and now it has entered into the descending output stage and its water cut has reached more than ninety percent. With oil field infill gradually in Beierdong Block, each series of well network production target getting worse gradually, intersecting with old well network stratigraphic position, and polymer flooding well network use part of water driving old well, making the contradictory of layer well network concatenate and dynamic regulation intensely. Especially as the block of infill adjustment proceeded earliest, acquired better developed effect at the beginning of regulation, but with the deep development of the field, after the phase of extra high water cut, exposed gradually some problems such as the perforating interval is too long, the contradiction of interlamination is obvious, the high water cut of multilayer is serious, bringing huge difficulty to dynamic analysis regulation.Basing on layer recombination and using the reservoir simulation method, the paper studied the distribution of remaining oil, forecast variation regular pattern of development indexes. By contrasting these indexes, the paper estimates the effect of layer recombination. It has important significance for the next period’s development.
Discussion on the Disappearance of Transition Flow of Fractured Gas Reservoir with Pressure Transient Analysis
Authors: Su Yun He , Liu Xiao Hua
Published: November 2012

In recent years, more and more fractured gas reservoirs were discovered in the world. In general, fractured gas reservoirs are defined as formation with double porosity system, which is composed with fissure and matrix. In reservoirs with double porosity system, only the fissure system are connected with the wellbore and have relatively high permeability, matrix rocks have very low permeability, gas can flow into the wellbore only via fissures, and the flow process be divided into the flow in fissures, transition flow and the flow in the total system. But transition flow is not found in the process of well testing, which results in misapplication of development decision support and selection in gas field development program. In this paper, the influent factors of fractured gas reservoir for estimation are studied by models of single well simulation, and the simulated results are analysis by the method of pressure transient analysis. For example: the time of pressure build-up test, production time, wellbore storage coefficient,kv/kh,the reservoir boundary, the pressure precision, the porosity of matrix and fracture, the permeability of matrix and fracture, the thickness of formation(partial perforation),skin, water saturation etc. The results of simulation show that the disappearance of the transition flow is caused by many factors, which include that the time of pressure build-up test is short, production time is not sufficiently long, ,the vertical permeability is much larger than the horizontal permeability and the formation is perforated partially, the time of the reservoir boundary for pressure is short than the transition flow, the porosity of matrix is close to the porosity of fracture, the permeability of matrix much smaller than the fracture permeability, the pressure precision is low. The transition flow is not affected by the skin, the wellbore storage coefficient and water saturation, which cover up the radial flow in fissure system.
Numerical Analysis of Deformation and Stability of Rock Slope under Rainfall Condition
Authors: Zhao Bing Hua , Zhang Shi Ping
Published: November 2012

Combining an example of rock slope engineering, the finite element model of excavation, reinforcement with rainfall infiltration conditions is built up. The process of stage excavation and reinforcement of the slope are simulated, and the stress and deformation law and displacement change of the slope during each stage period are analyzed, and the stability of slope is evaluated under some conditions. Moreover, the discontinuous deformatioanalysis model is set up, the limited internal friction angle of the sliding face of slope is obtained, and the slope stability is evaluated. It was shown that the conclusion of two methods was consistent, and the slope was basically stable.
Stabality Analysis of Deep Roadway Based on Coupled Thermo-Hydro-Mechanical Behaviors
Authors: Guo Qi Feng , Ren Fen Hua , Zhang Zhao Cai
Published: November 2012

In order to research the stability of excavation in deep mines under high ground stress, high rock temperature and high karst hydraulic, the interaction of stress field, seepage field and temperature field are discussed through basic constitutive relation, seepage equation, thermometer equation and coupled thermo-hydro-mechanical equation. A numerical model was built to simulate the excavation of deep roadway. The result shows that the simulated ground stress based on three fields coupled is much closer to the field measured value and the change of stress and displacement caused by the excavation are limited which is about same as the later monitoring.
Determining Informational Entropy of KARST Spring Hydrology Based on Wavelet Transform
Authors: Wang Yong , Shu Long Cang , Lu Cheng Peng , Zhang Rong Rong , Ping He
Published: November 2012

Wavelet transform by DB4 method can be applied to determine informational entropy of KARST spring hydrology conveniently. The complexity of KARST spring hydrology was described by entropy. Compared with the runoff of surface water, it concludes that KARST spring hydrology has higher complexity than the runoff of surface water.
FEM Simulation of Earth Pressure on Geosynthetic-Reinforced Soil Retaining Wall under Variable Rate Loading
Authors: Li Fu Lin , Peng Fang Le
Published: November 2012

On the basis of the Dynamic Relaxation method, a nonlinear finite element method (FEM) analysis procedure was developed for the geosynthetic-reinforced soil retaining wall. The FEM procedure technique incorporated the unified three-component elasto-viscoplastic constitutive model which can consider the rate-dependent behavior of both the backfill soil and the geosynthitic reinforcement. A simulation was performed on a physical model test on geosynthetic-reinforced soil retaining wall to validate the presented FEM. Extensive finite-element analyses were carried out to investigate the earth pressure distributions from the back of retaining wall under variable rate loading. It is shown that this FEM can well simulate the rate-dependent behavior and the earth pressure of geosynthetic-reinforced soil retaining wall.
Mechanical Analysis and Stability Design of Extrusion Forming Machine of Thorn Pile
Authors: Wu Wei Cheng , Gou Jing Guo , Jiang Jin Hua , Xue Xian Chao , Shao Jian Liang
Published: November 2012

In the paper basic knowledge of thorn pile and the working principle characteristics are introduced in different directions. Mechanical equilibrium conditions of thorn pile are that Adjacent to the piston must be each other angle of 60 °and Hydraulic cylinders are assembled In the longitudinal. The paper laid the foundation for the design and use of thorn pile extrusion forming machine.