bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Broad-Columns Joint and Analysis of Stress for Top-down Construction Method of Underground Engineering
Authors: Xiang Wei Ming , Zheng Xian Chang , Shen Kai Peng , Zhou Ming
Published: November 2012

According to the force problems caused by changing of structure forms of broad-column joints when using top-down construction method, this paper introduces the process of top-down construction method and design method of broad-column joint, using finite element software to analyze the stress of ring beam around broad-column joint, which is verified that adopting ring beam is safety and reliable, ring beam can transfer load and bear moment effectively, the strength of outsourcing column will be checked, finally it summarizes the characteristics of ring beam using top-down construction method.
Seismic Analysis of Nuclear Project for Joint between Intake Tunnel and Circumfluence Groove
Authors: Zhao Jie , Wang Gui Xuan , Lu Xu Hua
Published: November 2012

By adopting dynamic time-history analysis method, the seismic analysis for the joint between intake tunnel and circumfluence groove is performed by FLAC3D. Aiming at the mechanical characteristics of this structure and rocky features, according to the design scheme, the analysis of seismic response is carried out, on the base of which envelopes of internal forces are given in this paper. The results show that change of the temperature has much influence on internal force in the same load effect combination. Temperature load also change the direction of internal force in some part. For the similar anti-seismic design, this paper has certain reference value and guiding sense.
Effect of EPB Shield Tunneling on Adjacent High Speed Railway Viaduct
Authors: Xiang Yuan
Published: November 2012

Based on a project of subway constructed near elevated high speed railway, FEM method is adopted to analyze the effect of shield tunneling on the horizontal and vertical displacement of pile foundation of the viaduct as well as the pile caps on the condition that the nearest clear distance is 5m. The results show that with appropriate parameter control of shield tunneling, the effect of EPB shield tunneling on the displacement of piles in the three directions, i.e. horizontal displacement along and perpendicular to the longitudinal direction of the rail line and vertical displacement, is little. The same goes for the differential settlement between pile caps.
Research of Water Inflow Impact on Ecological Environment for Cimushan Tunnel
Authors: Jin Xiao Guang , Liu Hong Wei , Zhou Shi Xiang
Published: November 2012

Tunnel excavating breaks the original hydrological dynamic balance, promotes water cycle and interchange, the influences extent to groundwater flow system and groundwater level by tunnel discharge has direct connection with structure of groundwater aquifer system. The factors which impact ecological environment including the depth of groundwater, groundwater mineralized degree, suspended moisture content and salt content etc., of which, Groundwater level is very important to the survival of vegetation. Analyzing tunnel’s water inflow and the change of seepage field impact the groundwater level, the change of surface water and groundwater quality and the ecological environment influence of nearby tunnel. Studying the water inflow of tunnel impact on the tunnel site, which provide a reference of correct implementation of the tunnel construction principles “prevention, drainage, cut, plug union, adaptation to local conditions, and comprehensive management of water” when build tunnel in similar geological conditions of landscape areas.
Study on the Methods of Advanced Geological Prediction of Double-Arch Highway Tunnel in Karst Area
Authors: He Chong Xiong , Lin Chun Jiao , Yao Xiao
Published: November 2012

The paper pointed out a comprehensive advanced geological prediction method combining geological radar with advanced horizontal borehole according to the highway double-arch tunnel construction method in karst area, and had a successful application in the highway double-arch tunnel construction in karst area in Guangxi Province. It was proved in the tunnel construction that the prediction effect of the comprehensive geological prediction method was ideal.
An Analysis on Failure Pattern of CFG Pile-Net Composite Foundation of High-Speed Railway
Authors: Jiang Dan Ping , Wang Bing Long
Published: November 2012

CFG pile-net composite foundation has the advantages of small post construction settlement and uneven settlement, easy control of construction quality and fast construction speed. It`s widely used in subgrade engineering of high-speed railway. However, in coastal soft soil area, phenomena like breaking pile, collapsed embankment, cracking in embankment surface, undue settlement or convergence appeared in many places where railway CFG pile was improved during the foundation treatment, filling and preloading. Four numerical calculations were performed to investigate the failure pattern of CFG pile-net composite foundation with FLAC3D ( Fast Lagrangian Analysis of Continua, 3 dimensions) software. The paper describes four failure pattern, they are slip circle shear failure, pile tilt failure, roadbed sliding, soil sliding at pile end respectively through the analysis of the embankment and pile displacement as well as embankment deformation.
Cement-Gravel Piles for Highway Soft Soil Settlement Treatment in Yunnan Province
Authors: Wu Guo Xiong , Zhang Liang , Luo Li Juan
Published: November 2012

Highway in Yunnan Province, China, was known to suffer from local settlement due to the soft red soil foundations. This paper proposed cement-gravel piles to treat the settled foundations before paving the surface layer in highway repair and maintenance, in order to enhance the overall highway bearing capacity. Finite element software ANSYS was used to study the effect of cement-gravel piles on soft soil reinforcement and water reduction. The cement-gravel pile design parameters (9 to 10m for pile length, 1.2m to1.6m for pile spacing and 0.8m for pile diameter)are determined for different fill height, compactive effort and settlement magnitude. This research will provide helpful guidance to highway repair and maintenance of highway built in soft soil regions.
Poisson Log-Linear Regression Model for Rural Signalized Intersection
Authors: Ren Zhi Ping
Published: November 2012

Safety performance of rural signalized intersections is critical for identifying high-risk sites and predicting the hazardousness. This paper aims to develop a predictive model that will describe the safety of rural signalized intersections based on various input variables. Data are examined from 124 rural signalized intersections over three states, and Poisson log-linear regression model is presented, which connected traffic number and the average traffic volumes, geometric characteristics and signalization characteristics variables together. The model and associated data analysis reveal that average daily traffic, media width, speed limit, degree of horizontal curvature and left-turn lane are the factors that have greatest overall effect on safety. The results show that the Poisson log-linear regression model is able to describe the rural signalized intersection safety accurately. Using this model, effective countermeasures can be applied for improving traffic safety.
Mechanics Properties of the Lime-Fly Ash Stabilized Soil for Pavement Structures
Authors: Cheng Tao , Yan Ke Qin
Published: November 2012

Mechanics properties of lime- fly ash stabilized soil are investigated. First, the chemical composition of fly ash are analyzed by spectral analysis test. Compaction experiments of all mix proportion projects are carried out in different water conditions to obtain the optimum water contents. Then the optimum mix proportion is obtained by the unconfined compressive strength and the compression rebound modulus test. Finally, the pavement structures design for a highway of lime- fly ash stabilized soil road sub-base is done. By the comparison, a conclusion can be drawn that lime-fly ash stabilized soil is suitable for flexible pavement or semi-rigid pavement because of its good strength and rigidity which can effectively reduce thickness of the lower pavement and basic deflection.
Application Study of Impact Compaction Technology in Wetness and Softness Loess Roadbed Treatment
Authors: Song Rong Fang , Wang Dai
Published: November 2012

In order to study the applicability and strengthening effect of impact compaction technology in wetness and softness loess roadbed treatment, impact compaction technology was applied in ground treatment and layered filling roadbed compact of a freeway sub-grade construction, and compactness and settlement of the soil were also measured. Test results suggest: impact compaction technology can effectively apply to shallow wetness and softness loess roadbed treatment and the most effective depth is about 80cm, and this effect appears to increase with the impact compaction times and 30 impact compaction times is the most suitable. As regards the layered filling sub-grade, when the loose paving thickness is 40cm, compactness after 40 times compaction can satisfy specified demand. At the same time, combined with the test settlement, the control criterion of impact compaction quality is investigated.
Stressing and Monitoring Techniques for Steel Tie Rods in Special-Shaped Inclined-Column Bridge
Authors: Xi Shu Juan , Wan Tao , Zhan Qi Fang
Published: November 2012

The objective of this paper is to find the appropriate stressing and monitoring method of the horizontal steel tie rod which is installed in RC inclined-column bridge. Taking Dongxulu Expressway Bridge as study objective, based on the FEM simulation, pulling+electrometry method is selected as stressing and monitoring scheme. The monitoring data show that the selected stressing method is reasonable and the final tensile forces in the steel tie rods can meet the requirements of design documents. The stressing and monitoring techniques ensured the construction quality and safety which provides reference for similar works.
Bridge Technology and Aesthetics of Chinese Poetey in Bridge Design
Authors: Li Yan , Zhang Liang Liang
Published: November 2012

With the human environment requirements gradually increase, besides the bridge construction in engineering structure function, the aesthetic requirements are also caused the wide attention, which hide different history and culture related with the current existing social reality. The history and culture are presented by many styles; the Chinese poetry is one of way in China bridge design and construction. This paper focuses on the aesthetic of Chinese poetry in the design of Chinese bridge construction and also points out the modern bridge design points.
Effects of Overburden Thickness and Slope Grade of Loess Sites on the Amplification of Peak Acceleration
Authors: Chen Tuo , Ma Wei , Wu Zhi Jian , Wang Lan Min , Zeng Li Feng
Published: November 2012

Loess is widely distributed in China and the Loess Plateau is one of the major areas where strong earthquakes often take place. From the field investigation on earthquake damages caused by Wenchuan Ms 8.0 of 12 May. 2008, the seismic amplification effects were observed. In order to analyze the mechanism of the seismic amplification effects, microtremor surveys were carried out to detect the ground condition and the predominant frequency of the different sites of the same mountain was obtained. Moreover, the typical mesa of loess plateau is studied applying the dynamic finite element analysis method of two dimensions linearly equivalent for dynamic response numerical calculation, with different loess thickness and different slope grades. The magnifications of peak acceleration at the mountaintop and mountainside are obtained under different conditions. It is found that the magnification is related to the loess thickness and slope grades, which is in accordance with the earthquake damages, and the results show that the loess thickness and slope grade are important factors influencing earthquake damage.
Influencing Factors Analysis and Zonation Model Research of Landslides in Loess Region
Authors: Zhang Ze Zhong , Wu Zhi Jian , Wang Ping , Yan Wu Jian , Chen Tuo
Published: November 2012

Landslides zoning is an effective method of avoiding losses resulted from landslides in the loess areas. In this paper, the most important factors influencing the loess landslides are analyzed. As the five most important impact factors inducing the landslides，earthquake, water, slope, land use and natural density are selected to build a classification model based on AHP method. We obtained three kinds of landslides zonation maps under seismic motion with different exceedance probabilities. Combined with actual exploration, the zonation of landslides in Tianshui city is consistent with actual situation, which indicates that the classification model and the selected factors are appropriate to the loess landslide zoning.
Effect of Ridge Topography on Earthquake Ground Motion
Authors: Xu Guo Dong , Zhou Zheng Hua , Bo Jing Shan , Fang Wei Hua
Published: November 2012

The ridge topography can substantially influence seismic ground motion and, in general, causes the amplification of seismic ground motion amplitude at ridges. Fortunately, sets of three-component accelerogram, obtained by the observation arrays for topographic effect at Zigong Xishan, Jiangyou Doutuan and Qingchuan Sanguo from the great Wenchuan earthquake and its aftershocks, provided basic data for analyzing the effect of ridge topography on seismic ground motion. On the base of these acceleration records, peak ground acceleration and response spectrum ratios are calculated, and examined and compared in order to grasp the effect of ridge topography on ground motion. The findings showed that ridge topography has the remarkable effect on seismic ground motion, in which the amplification characteristics varies depending on the shape of ridge topography, and the amplification effect of the horizontal directions are not similar to the vertical direction, and in some periods are even less than 1.0.
Isolated Structures Research and Comparative with Traditional Seismic Structures
Authors: Yao Min , Li Tie Ying
Published: November 2012

This paper introduces the concept and design method of the base isolation structure, through the SAP2000 software to analyze 6-story reinforced concrete frame for nonlinear time-history analysis, comparison of isolated and non-isolated structure's maximum displacement, acceleration under frequent earthquake and the maximum displacement, acceleration of isolation structure under rare earthquake. The results show that the isolated structure have a much better seismic responding than the traditional structures.
Stability Analysis to the Imports Slope of the Spillway Tunnel of a Hydropower Station
Authors: Wang Rui Hong , Bai Jun Lei , Jiang Zhao Rong
Published: November 2012

Taking limit equilibrium calculation program SLIDE for the platform and establishing two-dimensional model of excavation slope. Based on unloading rock mass mechanics theory and method and considered the natural, excavation, reinforcement, water, rainfall, and other complex conditions to Study on the stability of slope during construction and operation, then using the outcome of the limit equilibrium method to give their assessment of slope stability. Analysis pointed out that : the high excavation slope basic in a stable state.
Applying the Method of Fuzzy Clustering to Study Leakage from Dyke
Authors: Fan Zhe Chao , Sun Jun
Published: November 2012

Applying the methods of stable isotopes and hydrochemistry to study the leakage from dyke is an effective way. But men only qualitatively analyzed and judged the problem. The authors attempted to perform the analysis of fuzzy clustering by applying the method of fuzzy clustering that stable isotopes and hydrochemistry values of 22 water samples were taken as index characteristic values and endued different weightings, combining some dyke. The clustering result showed that there was strong correlation in the data of stable isotopes, Cl- and TDS among the water samples of T12 borehole, gushing water 5m north of T9 borehole, river water and the effluent of drainage ditch north of T9 borehole. It is a proof to judge the leakage path that the water samples may has the same replenishment source.
Numerical Simulation of the Influence of Water Flow on Navigation and Optimization Scheme Selection of a Power Station
Authors: Hu Jin
Published: November 2012

In the 10 million Kw daily peaking capacity project of a Power Station, the daily average flow is 10000 m3/s, the starting passing dam flow is 2800 m3/s, 10000m3/s and 17200 m3/s, and the maximum turbine flow velocity Q is 7200 m3/s. Based on the adjustment and operation model mentioned above, this article conducts the numerical simulation of load increment and load rejection adjustment operation of the power station, the motion law of single oblique wave caused by the turbine flow and its time-varying process at the dam upstream river.This article also analyzes motion law of non-constant wave at the dam upstream river and its influence on the navigation flow condition when the single oblique wave passes the approach channel entrance area, and then calculates relatively accurate hydrodynamic parameters.In order to meet the navigation standards,we adopt the optimization scheme in which power units are divided into two groups and operate at 5 minutes interval.The calculation results indicate that they can all meet the navigation flow condition.When the power station jointly perform the load rejection adjustment operation and ship lock single-gates filling, the wave height in approach channel exceeds the standard,so the optimization scheme of time-staggered operation of the power unit and ship lock is adopted to reduce the wave height,and the results meet the navigation standard,it is the best optimization operation scheme of power unit to guarantee the safe operation of the river.
Hydraulic Experimental Study on Two Kinds of Nonmetallic Plastic Pipes
Authors: Liu Bao Jun , Guan Chen , Zong Zhi Chen
Published: November 2012

Two kinds of nonmetallic pipes, steel skeleton polythene plastic composite pipe and reinforced plastic composite pipe, whose application effect in oilfield are preferable, were chosen as the research objects in this paper. An indoor experiment apparatus was established to measure the on-way resistance of this two kinds of pipes under different flow rates. Then many hydraulic calculation formulas were used to calculate the on-way head loss of tested pipes and the relation curves of pressure drop gradient on flow velocity and Reynolds Number were drawn. According to the comparison of calculated value and measured data, appropriate calculation formulas of on-way head loss for the two nonmetallic pipes were sorted out respectively. The result shows that as for steel skeleton polythene plastic composite pipe and reinforced plastic composite pipe, Panhandle A formula and Drew Et al Formula are recommended respectively to calculate the on-way hydraulic computation.
Simplified Technology for Modified Micro-Irrigation of Agricultural Sheds
Authors: Yu Long , Peng Hui
Published: November 2012

Abstract. A great number of agricultural sheds are used in the China's farmland. With the development of science and technology and water use of tension , nowadays various proposed micro-irrigation techniques for the agricultural shed irrigation have been put forward , but as high-tech product and extremely high cost, the farmers cannot afford it, thus they have no choice but to use the traditional slow methods. To seek for the low cost of water-saving irrigation way, this paper put forward the original canopy stents arch tube after drilling converted into a canopy of the support and the unity of the new irrigation micro-irrigation technique, which has been combined with the new type of irrigation trellis to make complete design planning.
Characteristics of Combined Sewer Overflows in Nanjing and Selection of Intercepted Time
Authors: Feng Qian , Wu Chun Yan
Published: November 2012

The purpose of this study is to investigate the characteristic of pollutants overflow on storm events, relationships between pollutant load and rainfall duration, and rainfall intensity in Chaotian Palace, Nanjing City. The results showed that high pollutant concentrations were observed in the initial stage of runoff and decreased continuously over rainfall duration. Moreover, the wash off ratios of pollutants load decreased with rainfall intensity declining. Furthermore, initial 5, 10, 20, 30, 40 min intervals of a rainfall event were chosen to investigate the variation of pollutants load decrement rate of CSOs. An obvious corner at initial 10 min was observed for all parameters in whole storm events. The slope of curves before 10 min is steeper than after that one. Based on the analysis on pollutants load decrement rate of CSOs, 10 min could be chosen as control point in intercepted engineering for optimizing treatment facilities in order to achieve cost-effective CSOs control.
The Effect of Ventilation Mixed Coefficient on Main Filter Efficiency
Authors: Fan Yue Sheng , Xie Wei , Li Jin Tao , Li Lu Ye , Shi Hui Xin
Published: November 2012

In order to improve indoor air quality, the effect of ventilation mixed coefficient on main filter efficiency was analyzed. A mass balance equation for a well-mixed space was built. Some design equations for determination the main filtration efficiency was introduced. Because the air mixing is not perfect, the formula of air filter efficiency calculation on heterogeneous model was deduced. In addition, the relationship between ventilation parameters and the main filter efficiency was also analyzed. Through numerical calculation, the main filter efficiency under different heterogeneous coefficient is calculated. The results show that when the heterogeneous coefficient between 0.6 and 0.8, the main filter efficiency can take 1.30 to 1.80 to correct.
The Influence of Heat and Moisture Transfer in Soil on the Performance of the Ground Heat Exchanger
Authors: Shen Guo Min , Lu Chun Fang , Wang Yi
Published: November 2012

In this paper, a numerical heat and moisture transfer model (HMTM) and a pure conduction model (PCM) were established separately for unsaturated soil around the ground heat exchanger (GHE) and were numerically solved by finite volume method. The simulation results indicate that rejecting heat into soil can reduce moisture content in the vicinity of the borehole wall. When the initial moisture content is high, moister transfer has little effect on soil thermal properties. In this case, the results of the HMTM and the PCM are basically identical. On the contrary, when the initial moisture content is low, the thermal effect has significant influence on moisture transfer around the borehole wall, and the soil thermal properties will change correspondingly. In this case, there is a large difference between the results of these two models.
The Heat Transfer Model of V Shaped Solar Flat-Plate Air Collector
Authors: Chen Ming Dong , Liu Xue Bing
Published: November 2012

The V-shaped solar flat-plate air collector was put forward according to the existing problems of solar flat-plate air collector. V-shaped grid plate is used in the solar flat-plate air collector which can improve the efficiency of a flat-plate solar air collector via increase of solar energy absorption efficiency and heat transfer area. Energy balance model of the V-shaped solar flat-plate air collector is established according to the characteristics of internal structure and air flow way, and vent opening position is optimized using the CFD, the results showed that the temperature distribution is uniform when air inlet locates in the central axis of collector, it will provide a theoretical basis for the design of the V-shaped solar flat-plate collector.
Numerical Simulation on V Shaped Solar Flat-Plate Air Collector
Authors: Chen Ming Dong , Liu Xue Bing
Published: November 2012

The V-shaped solar flat-plate air collector was design in order to improve the efficiency of solar flat-plate air collector, and the heat transfer model was established on the base of solar collector working principle. Internal temperature distribution of collector and temperature change rule under different sunshine condition is simulated and the relation of collector height, solar radiation intensity and collector efficiency is analyzed. The result showed that internal air temperature of collector increases with collector height increase and gradually achieves a stable value. It will provide a theoretical basis for collector layout of solar house.
Experiment of the Mechanical Performance of Reinforced Ceramsite Lightweight Aggregate Concrete Beams after Fire
Authors: Wang Jian Min , Wang Neng Jun , Yuan Li Li , Jiang Wen Ting
Published: November 2012

The effect of fire exposure on the mechanical performance of reinforced ceramsite lightweight aggregate concrete was investigated. Two groups of beams were cast at the same time, exposed to fire at about 800 °C and then naturally cooled. The beams were tested by applying two point transverse loads incrementally. The load-deflection relationships both of bending and shear tests were recorded. For bending test, the disappearance of crack turning points in the loading curves, reduction of yielding and ultimate loads, and increase in deflection were observed. The reduction of ultimate load and increase in deflection of beams after fire in shear test were also observed. After loading test, the load-deflection relationships of main reinforcing bars and stirrups were tested to discuss the effect of fire on the reinforcing bars in beams.
Research on Disaster Prevention Technology of Huizhou Traditional Architecture
Authors: Sun Qiang , Wang Song Tao
Published: November 2012

On the basis of investigation and relevant statistical analysis about the Huizhou traditional architecture, this thesis elaborates the current disasters and main problems of the Huizhou traditional architecture and puts forward the measures of preventing the disasters. A discussion has also been conducted in the feasibility of the methods on disaster prevention. The purpose of this thesis is to provide technical reference for reforming and enhancing the quality of the Huizhou traditional buildings.
The Application of BP Neural Network in the Research of the Landslide Stability
Authors: Li Peng Li , Tian Wei Ping , Li Jia Chun
Published: November 2012

According to the basis of analysis of stability evaluation and prediction of landslide research status, discusses the factors influencing the stability of landslide and slope stability analysis methods; analyzing advantages and disadvantages of neural network research method, operability of evaluation of landslide stability analysis, select average slope, slope of the invading front, sliding surface slope, the maximum annual average rainfall, the recent slide situation, human engineering activities as indicators of slope stability evaluation， has established based on BP neural network landslide stability analyses and applying Matlab toolbox to train network. The error analysis result indicate the sample training result and the actual situation tally basically, prove this model can tally with the project reality.
Finite Element Analysis of Fire Behavior of Steel Girders in Bridges
Authors: Liu Yong Jun , Wang Guang Yuan , Song Yan Sheng
Published: November 2012

Fire is one of the most severe hazards to which bridges may be subjected during their lifetime. In recent years, due to rapid development of transportation systems, as well as increasing transport of hazardous materials, bridge fires have become a concern. Bridge fires caused by crashing of vehicles and burning of gasoline are much more severe than building fires and are characterized by a fast heating rate and a higher peak temperature which could lead to bridge collapse. Bridge failures during a fire can result in the disruption of commerce and services, and most importantly the loss of human life. In this paper, thermal and structural behavior of a steel girder of highway bridge overpass in the East Bay’s MacArthur Maze in Oakland collapsed on April 29, 2007 is studied by using general purpose finite element analysis software ABAQUS. Finite element analysis results demonstrate that unprotected steel bridge may collapse untimely under some fire scenarios and it is necessary to consider fire safety in steel bridge design.
A 3D Surface Data Model for Fast Visualization of 3DCM
Authors: Wang Qing Guo
Published: November 2012

3D data model is an indispensable component to any 3D GIS, and forms the basis of 3D spatial analysis and representation. At present, plenty of representative 3D data models are proposed. However, existing models neglect the display result and the consumption of storage space. Based on the analysis of existing 3D GIS data model, a 3D surface model is proposed for fast visualization in this paper, which is composed of node, segment and triangle. The data structure and formal representation of the proposed 3D surface model is developed to organize and store data of 3D model. Finally, an experiment is made to compare this 3D surface model with other 3D data model, and the result demonstrates that the 3D surface model proposed in this paper is superior to the existing data model in terms of data volume, moreover, it can acquire fast visualization speed.
Filtering LiDAR Data Using Binary Quadric Trend Surface and Morphological Approaches
Authors: Li Feng , Cui Xi Min , Zhang Ling , Shan Shu Wei , Song Kun Lun
Published: November 2012

Automatically identifying and removing above-ground laser points from terrain surface is proved to be a challenging task for complicated and discontinuous scenarios. Eight methods have been developed and contrasted with each other for filtering LiDAR (Light Detection and Ranging) data. Only one approach is difficult to acquire high precisions for various landscapes. This paper presents a method filtering point clouds in which firstly a binary quadric trend surface is used to remove most non-terrain points by a defined height threshold and subsequently a progressive morphological filter further is employed to detect ground measurements. The experimental results demonstrate that this method yields less type I and total errors compared with other eight approaches based on ISPRS sample data sets.
The Service of Digital Measurable Images in Smart Jiuzhaigou
Authors: Bai Yun , Xu Cong , Shao Zhen Feng
Published: November 2012

Along with the acceleration of social informatization and the increase of users' individual requirements, it becomes difficult for the electronic maps to meet the management needs of the smart scenic spots because there lack of information on real time data and participation of tourists. Digital measurable images (DMI) can make up for the disadvantages of electronic maps effectively. While integrating DMI with the electronic maps, a visual data platform and a true 3D visual management pattern can be built, which makes users enable to observe the scenic spot no matter from any perspective angles and provides personalized services for the different needs of different users. This paper mainly discusses the integration of DMI with the electronic maps and specific applications in Smart Jiuzhaigou.
Research on City 3D Modeling and Application Based on Skyline
Authors: Cui Jian , Ma Dong Ling , Cai Fei
Published: November 2012

With the rapid development of computer technology, communications technology, and other related technologies, the Digital City has become a hot topic of current research. The traditional method of constructing digital city based on ArcGis is very complex, the type of computer software that related is much more, and the interaction between the software is poor. For the traditional method of digital urban design is difficult to design and visualization effect is poor, this paper builds the techniques of campus apartment modeling based on the skyline combined specific examples of campus apartments, realizes three dimensional (3D) visualization and query and analysis functions of the campus apartment system and proposes a simple method of creating 3D landscape efficiently.
Three Dimensional Modeling of Buildings Using Three Dimensional Laser Scanning Data
Authors: Ma Dong Ling , Cui Jian , Cai Fei
Published: November 2012

This paper provides a scheme to construct three dimensional (3D) model fast using laser scanning data. In the approach, firstly, laser point cloud are scanned from different scan positions and the point cloud coming from neighbor scan stations are spliced automatically to combine a uniform point cloud model, and then feature lines are extracted through the point cloud, and the framework of the building are extracted to generate 3D models. At last, a conclusion can be drawn that 3D visualization model can be generated quickly using 3D laser scanning technology. The experiment result shows that it will bring the application model and technical advantage which traditional mapping way can not have.
Study on Restrain Effect of Ground Grouting to the Vertical Additional Force of Shaft Lining
Authors: Liang Hua Qiang , Wu Jing Xi
Published: November 2012

Based on the introduction of mechanism of ground grouting to reinforce shaft lining in detail, the paper analyzes the weakening effect of additional stress of shaft lining from ground grouting. According to the monitoring results of deformation of ground surface, shaft lining strain, and grouting curtain after grouting, the grouting activity makes the surface uplift of about50-80mm, shaft lining vertical strain release about 220με, mortar curtain average thickness near 8.2m, and the mechanical properties of soil are improved obviously.As a result of ground grouting effectively weaken the additional force has been accumulation for long time of shaft lining, and it can achieve the purpose of prevention and treatment the rupture of shaft lining. Ground grouting is a feasible means to control shaft lining.
Experimental Study of Improving the CO2 Flooding Development Effect in Ultra-Low Permeability Reservoir
Authors: Zhang Lei , Zhao Feng Lan , Hou Ji Rui
Published: November 2012

In order to improve the development effect of Chang-6 Oil Reservoir, five sets of different production pressure (1MPa, 2MPa, 3MPa, 4MPa, 5MPa) was designed to do CO2 immiscible flooding experiment to analyze the channeling laws. The experimental results showed that gas breakthrough time and gas channeling time were all shortened with the increasing of the pressure difference, but the ultimate recovery had a fluctuation change, increasing first and decreasing afterwards. And the production sharply increased in the gas breakthrough before and after. The best displacement effect was in 3MPa differential pressure. Then plugging experiment was made under the condition of 3MPa differential pressure, isopropyl amine was as plugging channeling agent. The experimental results: the residual resistance coefficient of plugging channeling agent was 8.56, and the range of enhancing recovery efficiency was 15%.
The Salinization Problem of the Deep Groundwater Based on Multivariable Statistical Methods
Authors: Wei Ai Hua , Ma Feng Shan , Yan Dong Fei , Feng Yu
Published: November 2012

To indentify the influence of human activities on groundwater chemistry, fifteen groundwater samples, from the mostly exploited aquifers, were collected at Tanghai County. Considering the multivariable statistical method is reliable to study the anthropogenic process affecting groundwater composition especially in the early stage, 10 measured hydrochemical variables were used in factor analysis and hierarchical cluster analysis. Factor 1 included EC, TDS, Cl-, and K+ is interpreted as relating to groundwater salinization. Factor 2 and factor 3 is mostly influenced by the water-rock interactions during the flow path and fertile contamination, respectively. Meanwhile, the Q-mode classification result reveals that the cluster 1 having high factor 1 scores also is related to the over-pumping of groundwater, in accordance with the factor analysis result. Generally, to protect freshwater resources and suitable development of this study, some related measures should be mitigated to limit groundwater mining.
Treatment of Well Point during Numerical Analysis about Water Pumping
Authors: Yuan Hua , Yan Chao
Published: November 2012

During a long time in the past, the treatment of well point has been a difficulty in academia. However well pumping is still inevitable in civil engineering circles due to its effective role on groundwater control. Firstly, the currently available treatment methods of well point are summarized. Through comparison between these existing methods and theoretical analysis, a drainage substructure is advanced, of which the inner layer is a square having equal perimeter with the actual well pipe. Results of numerical simulation upon a field pumping test prove the effectiveness and feasibility of proposed drainage substructure method, which may contribute to the well point simplification in future research.
Solving the Deflection Equations of Thick Plate under Concentrated Load
Authors: Zhang Dan
Published: November 2012

According to reciprocal-theorem method (RTM), the deflection equations of thick rectangular plate with two edges simply supported and two edges free under concentrated load are obtained in this paper. Simultaneously through the programming computation, the numerical results with actual value are obtained, which further showed the accuracy and superiority of RTM to solve the bending of thick rectangular plates.
The Analysis and Inspection Technology of Product Assembly Properties for Virtual Assembly Based on Assembly Force
Authors: Chen Xiu Xiang , Wang Ze , Dai Guo Hong
Published: November 2012

In the paper the need of virtual assembly property analysis was discussed，the indexes system of the product assembly properties was constructed based on assembly force. The mechanical model of strength and reliability analysis was established for hole and axle interference fit joint in virtual assembly. The mechanical model of strength and reliability analysis was established for key joint. The analysis and inspection technology of the product assembly properties for virtual assembly was put forward based on assembly force. The system of product assembly properties analysis was developed, and the system was tested by gear reducer.
Plastic Deformation Theory Application in Finite Element Analysis
Authors: Lin Wen Shan
Published: November 2012

In the present study, the constitutive law of the deformation theory of plasticity has been derived. And that develop the two-dimensional and three-dimensional finite element program. The results of finite element and analytic of plasticity are compared to verify the derived the constitutive law of the deformation theory and the FEM program. At plastic stage, the constitutive laws of the deformation theory can be expressed as the linear elastic constitutive laws. But, it must be modified by iteration of the secant modulus and the effective Poisson’s ratio. Make it easier to develop finite element program. Finite element solution and analytic solution of plasticity theory comparison show the answers are the same. It shows the derivation of the constitutive law of the deformation theory of plasticity and finite element analysis program is the accuracy.
Velocity Distribution of Viscoelastic Fluid Axial Flowing in Eccentric Annulus Based on the Upper-Convected Maxwell Model
Authors: Han Xue Song , Li Fang Mei , Liu Bao Jun
Published: November 2012

After polymer flooding has been put into effect in Daqing oilfield, eccentric wear of sucker rod and tubing has been so serious that it made the rods break. In order to analyze the cause of eccentric wear based on the upper-convected Maxwell model, the flow equation of viscoelastic fluid in eccentric annulus was established in cylinder coordinate system. Then the equation was transformed in bipolar coordinate system and dispersed by control-volume method. The velocity distribution was solved by ADI methods and example was calculated which provides theory basis for solving eccentric wear problems.
The Finite Element Method for Mechanics Analysis of Joints in pin Coupling of Beam Structures
Authors: Xia Yong Jun
Published: November 2012

Pin coupling is widely used in engineering structures and its local strength analysis is an important item during design. The methods to calculate joints in pin coupling of beam structures are presented and analysis, then the finite element modeling and the whole calculating process of beam structures with pin coupling are discussed. The concentrated forces under pin roll are transformed into equivalent pressure and the expressions of the equivalent linear and cosine pressure function are derived. The example’s results show that the finite element solutions of the two equivalent pressure functions are similar and these equivalent pressure functions can be used for engineering calculation of joints in pin coupling of beam structures.
Dynamic Response of a Poroelastic Half-Space with Semi-Permeable Surface Subjected to Time-Harmonic Vertical Load
Authors: Luo Xi , Zeng Xian Wei , Tang Li Qun
Published: November 2012

Based on Biot’s elastodynamic theory for poroelastic media, the dynamic response of a poroelastic half-space due to a time-harmonic concentrated vertical load applied at the free surface is investigated. Different from previous treatments of the free surface as either fully permeable or fully impermeable, the free surface of a pororelastic half-space is treated in this study as a more realistic semi-permeable boundary condition, i.e. the permeability of the free surface is considered. The governing equation for axisymmetric motion of a poroelastic half-space is solved by applying the Hankel integral transform. Numerical results are presented to show the effects of semi-permeable boundary condition on the dynamic response of poroelastic half-space.
Research of Ship-Bridge Collision early Warning on the Basis of Fuzzy Neural Networks
Authors: Yang Xue Hui , Zhou Xin
Published: November 2012

The paper establishes the ship-bridge collision early warning model on the basis of Fuzzy Theory and neural network method, puts forward the basic principles and concrete process of the ship-bridge collision early warning method. The model and calculation method applied in VTS after test and verification, it can achieve the practical accuracy and effect and finally achieve the active ship-bridge collision early warning.
Prediction of Mine Accidents Based on Fractal Theory
Authors: Chen Yong Feng , Sun Quan Xin
Published: November 2012

The mine accident prediction model was established on the basis of the fractal theory. The model has made an accurate check by the existing accident data. The predict results are 73 and 45, and the average relative error rate is 4.8%, which is rather satisfactory than ever compared to the actual data. Finaly, the example based on the model is used to make a prediction to the accidents numbers in June 2012-August 2012, and the predict results are 48, 43 and 44.
Research on 3D Dredged Soil Visualization Analysis of Qinhuangdao Harbor Project
Authors: Miao Zheng Jian , Zhong Deng Hua , Li Ming Chao , Gao Wei
Published: November 2012

In order to rapidly, accurately and vividly provide plenty of underwater soil analysis information for design and construction in dredging engineering, this paper took Qinhuangdao harbor project as an example, introducing a three-dimensional underwater soil modeling method and establishing the 3D unified soil solid model of Qinhuangdao harbor. The model has a small amount of data storage, high precision and is easy to operate graphical computing. Based on the model, and with 3D visualization technology, a series of soil visual analysis were conducted, including virtual digital drilling, arbitrary cutting analysis and water depth elevation analysis. Moreover, the model could quickly output scene graph, 2D cross-section and isoline map. Practical engineering applications indicate that 3D dredged soil visualization helps engineers to understand the space distribution of underwater soil. The proposed method can provide a convenient support tool for dredging engineering soil analysis.
Study and Application of Slope Displacement Time Series Forecast Based on CO-WLSSVM
Authors: Xu Fei , Wang Ke
Published: November 2012

A multi-dimension admissible support vector wavelet kernel function is introduced and the model of wavelet least square support vector machine (WLSSVM) is optimized by chaos optimization (CO), which is named as wavelet least squares support vector machine based on chaos optimization (CO-WLSSVM).The optimized model improves the forecasting precision depending multi-dimension interpolation character and sparse change character of the wavelet and quick convergence to the optimum solution of the chaos optimization. The CO-WLSSVM is applied to forecast the displacement of left side bank of slope in first-stage hydroelectric station of Jinping. The result shows that the model possesses higher precision of forecasting.
Analytical Analyses of a Failure Department Project in Northern Ireland
Authors: Zhuang Yan , Cui Xiao Yan , Liu Han Long
Published: November 2012

A development of 2 and 3 storey town houses and 4 storey apartment blocks were constructed on a site bordering the River Erne in Enniskillen, Northern Ireland. Within two years of completion, the ground deformations around the buildings constructed on the ‘load transfer platform’ (LTP) were becoming noticeable. Sometime later, the pile caps ‘punched’ into the material above, causing significant deformation. According to detailed investigation and assessment of the cause of failure (Milligan, 2006) [1], the problems were caused by excessive and continuing deformation of the load transfer platform. The analytical analyses have been used to investigate the performance of reinforced piled embankment over very soft soil to understand the reason for failure. Results showed that subsoil could give a major contribution to overall vertical equilibrium, and reinforcement can only give contribution at relatively large settlement. The performance of actual structures has on occasions been problematic when relying on multiple layers of relatively low strength geogrid.
Research on Management Information System for Construction Consultant in Hydropower Project Based on Process Control
Authors: Wang Rui , Zhong Deng Hua , Zhou Jun Ping
Published: November 2012

The work of construction consultant in hydropower project in China is different from other countries and the Chinese consultant is more like a supervisor whose work is constrained by the owner. Therefor the consultant has to coordinate among designers, owner and constructors and the information management becomes complex and trivial, especially in the manual management mode, it is difficult to communicate among departments and staffs and manage the information promptly and efficiently. This paper proposed a process control based information management method which includes the main consultant workflow and the consultant business database and used the workflow technology to develop a flexible and adaptable MIS (Management Information System) for construction consultant.
Study on the Selection of Subcontractors Based on Fuzzy Comprehensive Evaluation
Authors: Feng Yu , Bin Kang
Published: November 2012

From the point view of the general contractor, we can analysis of the various factors which affect the selection of subcontractors and construct them as the basis for the comprehensive evaluation index system of the subcontractors’ capacity risks. Then we can use Fuzzy Comprehensive Evaluation method to put forward the selection of subcontractors based on Fuzzy Comprehensive Evaluation. Finally, we list some engineering project examples to verify the feasibility and practical of the comprehensive evaluation system to provide references and recommendation for general contractor on evaluation and selection of subcontractors.