bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization of Black Oil Model-CO2 Flooding in Low Permeability Reservoir
Authors: Song Li Yang , Wei Jian Cheng , Xu Xiang Min , Gao Ting
Published: July 2014

This paper mainly studied the influence of starting pressure gradient in CO2flooding. The capillary pressure of low permeability reservoir is much larger than the ordinary reservoir, so that the influence of starting pressure gradient can not be ignored. Since CO2flooding will be widely used in the development of low permeability reservoirs, it is necessary to study the influence of starting pressure gradient. This paper mainly used Runge Kutta Fehlberg Method and Adams Fourth-order Predictor-Corrector to solve the black oil model, which was founded to study the process of CO2flooding. These two methods considered the starting pressure gradient during the CO2flooding, and the influence of reservoir permeability and crude oil density were studied by founding black oil model and use these two methods to solve the model. We have compared the production rate with staring pressure gradient and without starting pressure gradient.
Rapid Excavation Technical Research of Blasting Mining Face in Liangzhuang Mine
Authors: Yan Zheng Bin , Xu Xiao , Li Tao Tao , Wu Shang , Ma Shi Yan
Published: July 2014

The paper studied the driving blasting mechanism and blasting parameters in working face, in order to improve the advance rate of blasting mining face in Liangzhuang mine. The research results show that taking the air column interval charging structure can reduce the peak pressure on the borehole wall, change the distribution ratio of explosion energy, decrease the smash district radius and increase the effect of secondary stress wave. To improve the energy utilization efficiency was improved in this structure, the consumption was reduced by 35.3%, the cyclical footage from 0.8m to 1.2m and crushing effect is obvious.
Analysis of Engineering Characteristics of Cement Soil with Low Mix Additions
Authors: Liu Ai Min
Published: July 2014

The mold bag cement soil was used to be as the material of dike core while building cofferdam. So the engineering characteristics of cement soil with low mix additions were analyzed in this paper. It was pointed out the unconfined compressive strength of cement soil is mainly related to the property of soil, water content, cement mixing content and degree of mixing uniformity, but has little to do with curing condition, cement adding way and the property of mixing water.
Analysis on Wind-Induced Vibration of Tall Buildings in Hilly Terrain
Authors: Sun Yi , Deng Nuan , Li Zheng Liang
Published: July 2014

The responses of tall buildings under wind loads in hilly terrain are remarkably different from that in flat terrain. Wind load codes can’t work efficiently or directly to calculate the wind-induced vibration of tall buildings in hilly terrain. Utilizing some wind tunnel test results of wind field in hilly terrain and pressures on tall buildings, the access to response of tall buildings on hilly terrain were provided. Some effects from hill characteristics to building responses were discussed.
Energy Absorption Numerical Analysis of Mine Impingement Thin-Walled Components with Different Configurations
Authors: Tang Zhi , Pan Yi Shan , Zhu Xiao Jing
Published: July 2014

For the effective prevention and control of mine bumps, or to a certain extent, to reduce the loss the losses caused by impact ground pressure accident,thin-walled components are proposed to be applied as a scaffold components in roadway supporting. Components impingement is reflected in the component crushed process ,in which the impacting energy absorption and crushing space provide certain amount of energy to free up space. The energy absorption characteristics of different configuration thin-walled components has been simulated with ABAQUS finite element, such as the conventional square,regular hexagon, round and origami square, regular hexagon etc,.and the results showed that: (1) The problem of conventional components is larger load fluctuation coefficient. Origami component is a kind of perfect impingement components ,as it can reduce peak loads and the load fluctuation coefficient effectively. (2) Under different ratios width-to-thickness, components can have different deformation modes, but the relationship of peak load and wall thickness is near linear and has nothing to do with the deformation modes. (3) The component can have a relatively lower crushing peak load and load fluctuation coefficient and relatively higher specific energy absorption,if given a suitable diamond concave angle. impingement components using combined with existing supports can make the existing supports to become top beam impingement support , mudsill impingement support ,two sides impingement support and impingement hydraumatic support and so on.
Freezing Damage Analysis of Jintaizi Fishing Floor Engineering in Fuyu
Authors: Dou Li Jun , Wang Wei , Xu Ming Yu
Published: July 2014

Frame structure building is widely used for its advantages of flexible space, light weight, saving material, building plan can be flexibly arranged and so on. However, researches on frame structure built in the water in cold areas, under horizontal ice pressure, are very few, and there is also no ice pressure calculation method for this structure form. Combining with the damage phenomenon of Jintaizi fishing floor engineering, analyzed the causes of freezing damage from ice pressure, temperature joint, structure form, and put forward a concept of ice pressure influence width for frame structure under the effect of ice. This article provides a reference for ice pressure calculation and the design of frame structure buildings which built in the water.
The Coupling Interaction in the Rankine Method for Concrete Filled Steel Tube Columns under High Temperatures
Authors: Yao Yao , Hu Xin Xin
Published: July 2014

The Rankine approach has been extended to predict fire resistance of steel, reinforced concrete and concrete filled steel tube (CFS) columns. The conventional Rankine method ignores the coupling interaction and leads to a lower bound prediction compared with actual failure loads, especially for CFS columns. This paper develops a rational and straightforward approach to predict the fire resistance of CFS columns considering the shear bond effect. The method hinges on concept of modified buckling coefficient, and applicable to both axially and eccentrically loaded columns. It shows that the proposed approach predicts the failure load more accurately compared with the traditional Rankine approach. Four case studies comprised of 118 CFS columns from different labs are analyzed to verify the proposed approach. Material deterioration at elevated temperature with regard to the strength and stability of columns is also quantified.
A Study of Storm Surge Risk Index System
Authors: Liu Qiang , Yuan Zhen Zhen
Published: July 2014

Natural disasters refer to casualties, property damage and social instability. Coastal urban areas with a high population density coupled with the construction of man-made structures are particularly subjected to storm surge hazards, which have become an increasingly urgent problem. In this paper, we try to set up a risk index system, including risk indicator, vulnerability indicator and prevention and mitigation capability index. Each of the risk components has large number of variables and quantities. Through displaying losses and characteristics of the four natural disasters, we put forward suggestions for better disaster mitigation. So that a better understanding of storm surges risk profile and early disaster warning measurement could be achieved.
The Analysis of Hysteretic Behavior of Concrete Filled Double Skin Steel Tubular after Exposure to Fire
Authors: Liu Xiao , Bao Jun Tao , Wang Bing
Published: July 2014

In recent years,frequent fires and earthquake make the buildings damage badly,and it causes huge economic loss. Concrete filled double skin steel tubular (Hereinafter referred to as CFDST) as a new member of structure,its mechanical properties are similar to concrete filled steel tubular,at the same time has better fire performance and seismic capacity. Based on this background,the paper expounds study the mechanical performance of CFDST is very important,the hysteretic behavior is the main mechanical indexes of the seismic performance of CFDST after exposure to fire. The study of it will fill the new component in the blank of seismic performance research.
Mechanical Performance Calculation of Single-Layer Cable Mesh Point-Supported Glass Curtain Wall under Fire Conditions
Authors: Gong Ling Feng , Bai Yin , Li Si Qi
Published: July 2014

High-strength prestressed cables were main bearing parts in single-layer cable mesh point-supported glass curtain wall structures, and it was always unable to take effective fire prevention measures on steel cables due to small sections. That the elastic modulus and yield strength of prestressed cables decreased sharply under fire conditions would threaten safety performance of the whole structure seriously. When glass breakage is considered and not considered, nonlinear finite element complete-process analysis for the single-layer cable mesh point-supported glass curtain wall structure was conducted. Influences of various factors on structure mechanical performance were studied under fire conditions. Through the calculation analysis of different joint constraint models, the ultimate temperature table suitable for different sizes and cable spacing of glass curtain walls was obtained under uniform heating conditions, and proposals for fire-resisting design were given.
Review on Study of Fire Behavior of Bridges in China
Authors: Liu Yong Jun , Yao Yue , Li Xi Xin , Chen Xiao Dong
Published: July 2014

In recent years, numerous bridges have been damaged seriously even destroyed by fire hazards in China. Fires in bridges can result in significant losses of life and property, as well as traffic jam. Therefore, fire hazard in bridges is becoming a growing concern in the whole life cycle of design, construction, use and maintenance. There are few literatures on bridge fire incidents and research data in developed countries. In this paper, several typical bridge hazards in China shall be introduced firstly. Some research progress on bridge fire in China is described secondly. Critical research needs and are pointed lastly. The authors hope this paper may be a useful reference for people who hope to learn about the situation and research progress of bridge fires in China.
A Study on Informatization Construction of Sharing “One Map” between Land and Planning Departments
Authors: Yang Guang , Zhou Tian Tian
Published: July 2014

Based on the full research on the recent information construction of land and resource department and planning department, and the requirement of the related business management, this article has a detailed illustration of the popular construction ideas, "resources sharing" and "One-Map", along with the construction conception of geographic information system with sharing "One-Map" between land and planning departments.
Research on the 3-D Scene Quick Build Method of Virtual City and Implementation Method of Basic GIS Function
Authors: Yang Chang , Li Hao , Gao Peng , Zhang Rong Chun
Published: July 2014

Aiming at the common problems of virtual city modeling,such as low efficiency and large amount of data，this paper proposes a quick method to build a virtual city.The method realizes data read automatically through AutoCAD VBA programming, generated the VRML code automatically, buildthree-dimensional scene by the VRML code integration and realize the Web publishing of virual city via Web.
Discussion on the Measurements in Cantilever Construction with Guyed Hanging Basket
Authors: Gui Fang Ru
Published: July 2014

Guyed hanging basket is qualified with reasonable structure , great carrying ability and clear construction process, and also can provide a good operating space for beam segment construction. Applying cantilever pouring construction with guyed hanging basket should be the development direction of the construction of large-span reinforced concrete cable-stayed bridge. By taking the girder construction of the grand bridge over Beijing-Hangzhou Canal as an example, this paper introduces the measurements in cantilever construction with guyed hanging basket, aiming at providing reference for other similar projects.
Error Analysis of the Settlement Observation
Authors: Wang Liu , Fang Lin , Zhang BO , Huang Chang Cheng
Published: July 2014

This document bases on settlement observation of a residential district which is influenced by the subway construction in Shanghai China.Because of the long-term measurement,there were some equipment boxes installed on the top of the settlement marks.Thus making the leveling rod in an leaning angle to the right or left direction relative to the sight line.In order to know the error of the measurement,we make analysis of the error.And it also can be a reference for other surveyings when encounter this similar circumstance.
Application of Stereo Vision Measurement Technology in the Detection of Round Hole
Authors: Wang Qiang , Cui Xi Min , Li Cong , Cui Jia Jie , Li Liang Jian
Published: July 2014

In precision machining, we often detect the location of some round holes or other geometric parameters. Given the disadvantages of traditional method is contacted, artificial and time-consuming, this paper has proposed a image measurement method based on stereo vision. We use the method of digital image processing to perform the denoising, binarization, edge detection, and centralized location of the orifice image, and analyze the accuracy of the hole machining and arrangement. Experimental results show that the error of image measurement proposed is less than 0.14mm, which meets the general requirements of the hole measurement precision and is applicable to the online measurement that the accuracy requirement is not high and the task with large amount of object to detect.
Application of Model GM (1,1) to Settlement Forecast of High-Fill Airport
Authors: Wu You Ping , Wang Jia Bang , Wang Chun Tao
Published: July 2014

GM (1,1) model was created to forecast the development and change of a high-fill settlement by viewing the high-fill settlement process as a grey system, conducting generation treatment and taking the settlement incremental data sequence as the original data sequence. According to example which demonstrated that the measured settlement at the forecasted model analyzing and monitoring point was practical and relatively accurate.
Study on Application of Terrestrial 3D Laser Scanning Technology in the Calculation of the Fine Earthwork
Authors: Feng Xiao Gang , Li Meng , Liu Jing Xiu
Published: July 2014

Supported by terrestrial 3D laser scanning technology, by using the GPS RTK technology as the verification. Explored the application of terrestrial 3D laser scanning technology in the calculation of fine earthwork, including the whole process from program design, pre-organization, field measurements applied to the calculation and submit of indoor operation results. In addition, Lanhaiwan project in xi’an of shannxi province was taken as a case to introduce detailed processes of fine earthwork calculation, The results show that the terrestrial 3D laser scanning technology can be well used for accurate measurement of the earthwork.
Application and Research of 3D Laser Scanning Technology in Steel Structure Installation and Deformation Monitoring
Authors: Ma Dong Ling , Cui Jian , Wang Shi Yan
Published: July 2014

The traditional steel structure deformation monitoring generally uses Total Station and GPS to do monitoring quality control, but there are some disadvantages of these methods. Laser radar technology is a new non-contact measurement technology emerged in recent years. It is ideal for installation and slip construction quality monitoring of large-span steel structure. This paper use laser radar technology to monitor large-span steel structure construction, use laser scanner to scan on steel every period of time and collect 3D point cloud data of the feature points after a period of time. Through the comparative analysis of the data and the chart which reflect the amount of deformation of the feature points, it can accurately obtain the result of structural deformation, oblique direction, and the deviation between the actual coordinates and the design coordinates, which provides the most accurate and direct information for the project. Laser radar technology solves the difficult issues such as workload outside the industry and difficulties in visibility of the traditional measurement methods, greatly improves accuracy and efficiency compared to traditional methods, and achieve a high-precision quality control over the construction.
Effect of Ring Support Position and Geometrical Dimension on the Free Vibration of Ring-Stiffened Cylindrical Shells
Authors: Liu Xiao Wan , Liang Bin
Published: July 2014

Effect of ring support position and geometrical dimension on the free vibration of ring-stiffened cylindrical shells is studied in this paper. The study is carried out by using Sanders shell theory. Based on the Rayleigh-Ritz method, the shell eigenvalue governing equation is derived. The present analysis is validated by comparing results with those in the literature. The vibration characteristics are obtained investigating two different boundary conditions with simply supported-simply supported and clamped-free as the examples. Key Words: Ring-stiffened cylindrical shell; Free vibration; Rayleigh-Ritz method.
Influence of Vertical Vibration on Surface Velocity of a Liquid Bridge
Authors: Liang Ru Quan , Zhang Zhi Hui , Gao Tai Yin , Yan Fu Sheng
Published: July 2014

In this paper, the vertical vibration influence on the surface velocity of a 5cSt silicone oil liquid bridge has been investigated numerically. The Navier-Stokes equations coupled with the energy conservation equation are solved on a staggered grid, and the two-phase surface is captured by using the mass conserving level set method. The present results indicate that the axial and radial surface velocities of the liquid bridge are suppressed by the external vertical vibration.
Study on Numerical Simulation of Explosion in Soil Based on Fluid-Solid Coupling Arithmetic
Authors: Song Juan , Li Shu Cai
Published: July 2014

Numerical simulations play a significant role in explosion in a mass of soil due to an underground explosive. Common methods available in hydrocode for fluid-solid coupling process are contact algorithm, Lagrange algorithm, and Arbitrary Lagrange-Euler (ALE) algorithm. A numerical simulation of explosion process with concentrated charge in a mass of soil was carried out by using three methods in this paper. The dynamic response of soil medium, the formation and development law of explosion cavity and the explosion wave propagation law in soil were simulated. Merits and drawbacks of three different methods are analyzed in the aspect of modeling, simulation results and computing cost.
Study on Stability of Functionally Graded Cylindrical Shells Subjected to Hydrostatic Pressure
Authors: Liu Xiao Wan , Liang Bin , Li Rong
Published: July 2014

The stability of submerged functionally graded (FG) cylindrical shell under hydrostatic pressure is examined in this paper. Based on the Flügges shell theory, the coupled frequency of submerged FG cylindrical shell is obtained, using wave propagation method and Newton method. Then the critical pressure of FG cylindrical shells is given by applying linear fitting method. Results are compared to known solutions, where these solutions exist. The effects of constituent materials, volume fraction, boundary condition and dimensions on the critical pressures of submerged FG cylindrical shell are illustrated by examples.
3-D Numerical Simulation of Flow Structures in a Sharp Bend of the Lower Yangtze River
Authors: Jia Dong Dong , Lu Yin Jun , Zhang Xing Nong , Zhang Xi Bao
Published: July 2014

The three-dimensional (3-D) flow structures in the Taiziji Waterway of the Lower Yangtze River were simulated by a 3-D numerical model, where the river plan form is a sharp bend and island-braided. The verification results of the 3-D model indicated that the simulated results agree with the measured data. The patterns of 3-D flow structures in this sharp bend with different discharge were analyzed based on the calculated results.The simulated results demostrated that strong 3-D features of flow structures can be found in the sharp bend of Taiziji Waterway, the bottom velocity vectors point to the convex bank while the surface vectors point to the concave bank. The velocity distribution alone the lateral direction in the sharp bend depends mostly on the flow discharge. The discharge ratio of the left branch increases as flow discharge increases.
Research and Development on Similarity Principle of Model Pile
Authors: Wang Xin Quan , Zhang Shi Min , Liao Juan , Huang Ying Sheng
Published: July 2014

Similarity Principle, applied to model test, is an important theoretical basis for simulation of the prototype test. By simulating the prototype test. On the base of model test to make research on this field indirectly. Saving time and energy, the article is based on the similarity principle, and combine with the model pile static pressure test, discuss the application of similarity principle.
Simulation Analysis of Built Environment Based on Design Builder Software
Authors: Zhang Lin
Published: July 2014

This paper introduces Design Builder (DB) software and analyzes the computational simulation capacity of Design Builder that is used to deal with built environmental issues, in order to help readers to have a more comprehensive understanding of Design Builder’s simulation capacity in processing built environment.
Calculation on Internal Force Effect of a High-Speed Highway Prestressed Concrete Extra-Dosed Cable-Stayed Bridge
Authors: Chen Xing Zhou
Published: July 2014

The Extra-dosed cable-stayed bridge is considered as a new popular type of bridge structure in recent 20 years, whose mechanical properties and economic span both lie between continuous beam (or rigid frame ) bridges and cable-stayed bridges. This design is a double-cable-plane (85+150+85) m prestressed concrete Extra-dosed cable-stayed bridge, whose maximum Design speed is 100km/h and its width is 25.50m. The form of the highway is sextuple line which is 10.75m far away,and the cross-sectional slope is 2%. The girder body adopts three cell and single box, the height of beam takes quadratic parabola relation, which is 5m high at the middle support, while at the side support and the midspan is 3m. Vehicle standard load was applied on the bridge. The design uses Midas/Civil to establish the finite element model that is reasonable and simple, analyzing the structure behavior of the girder body under loading, especially the internal forces of bridge structure under dead load, live load and additional force.
A New Algorithm for Computing Threshold Value Used to Image Segmentation
Authors: Chen Guo Yan , Liang De Qun , Zhang Ying , Xie Hai Yan
Published: July 2014

With the development of computer technology, digital image technology is also to grow rapidly. At present, the image processing has become a popular research field. Segmentation is a very important critical step in image processing tasks, which directly affects the subsequent analysis results. Cluster analysis belongs to the category of unsupervised classification and it is not depended on any prior knowledge of the category, so it usually serves as a basic tool to be used for the initial stage of image segmentation. In this paper, we propose a weighted fuzzy threshold algorithm based on fuzzy relations. This algorithm determines the fuzzy membership function according to the similar relationship between pixels, and emphasizes influence of sharpening features of Gaussian function. The new method overcome the drawbacks of clustering algorithms such as, sensitive to the initial value, need to pre-set number of categories. The numerical results show the effectiveness of the new method.
From CAD to the Rapid Development of BIM
Authors: Li Jian
Published: July 2014

While architectural design went into the time of BIM, it meant not only the update of tools and methods, but also the update of design procedures and thinking model. In the meantime, while engineering construction went into the time of BIM, it meant not only the update of design delivery methods, but also the update of interactive mode and consequence among the links of entire industry. Therefore, there are so many obstacles to overcome and it depends on the rapid upgrade of information technology application and management standards of the related enterprises as well as the entire industry.
Normally Consolidated Subgrade Limit Bearing Capacity Calculation Using Slip Line Method
Authors: Chen Ming , Zhou Tai Quan
Published: July 2014

Normally consolidated subgrade limit bearing capacity of foundation soil was studied in the paper using slip line method. Slip line results are found to be consistent with the results calculated by Terzaghi theoretical formula and Hansen theoretical formula. Then the influence of cohesion, friction angle for normally consolidated subgrade is studied under complete smooth or complete tough conditions. The results show that the normally consolidated subgrade limit bearing capacity increases linearly with the increase of k, γ, while it increases nonlinear with the increase of Φ and the increasing growth rate improves with increasing value of Φ.
Numerical Simulation and Testing of 45 Architecture Steel Welded Based on Gaussian Heat Source
Authors: Ji Jian Bo , Zhang Jin Zhou , Zhang Lei
Published: July 2014

Using sysweld software based on the Gauss heat source, simulated welding process of 45 steel plate, analysed welding temperature field、stress and strain. The maximum stress value appeared at the initial welding position of junction of base metal and weld. As the most dangerous section, the maximum strain value appeared at the end welding position of the junction of base metal and weld. Compressive strain appeared at the central part of weld and the tensile strain appeared at the junction of base material and weld. The deformation was of upward warping, which is helpful to explore the numerical simulation of welding structure.
Analysis on Application Prospect of BIM Technology in Granary Designing
Authors: Chen Gui Xiang , Hao Bing Hui , Zhao Yi Qing
Published: July 2014

BIM is a kind of multidimensional model information technology based on CAD which has been applied in some large projects at home and abroad. The technology of BIM has the characteristics of 3D visualization, virtual design and collaborative design and so on. In this paper, ideas about applying BIM Technology in granary projects have been put forward from the design stage, project implementation stage and the stage of cost control by taking a big diameter underground silo of reinforced concrete for example, simulating the architecture, structure, process of construction and process of grain flowing of underground silos, then creating the model of architecture, dynamic construction model of 4D. The article provides a new approach of applying BIM technology to granary facilities.
Using CAD for Selecting Different ACS Engineering Systems of Buildings and Structures in the Presence of Interference and Restrictions
Authors: Volkov Andrey , Sedov Artem , Chelyshkov Pavel , Doroshenko Anna
Published: July 2014

The complexity of modern design objects, especially automatic control systems (ACS), the constant tightening of requirements for projects, the very high price of erroneous design decisions are inconsistent with the traditional tools of technology and design. A way out is to develop and implement a new set of tools - tools of the designer - computer-aided design.
Analysis on Strengthening of Plant to Slope Soil under Orthogonal States
Authors: Gu Jun Bin
Published: July 2014

In the traditional slope engineering, the slope processing mainly emphasizes the strength effect, and ignore the damage to the environment. Along with people are to landscape and strengthening of environmental protection consciousness, the slope protection method of tradition can not satisfy the requirement of people.Use Interaction of plant roots and rock-soil body to reinforcement and anchorage on the slope surface protection and reinforcement, which can meet the design requirement for stability of slope surface and restore the damaged natural ecological environment. This paper set up the relations between the tensile strength of plant root and the root diameter, establish the theoretical calculation model of the interaction between plant roots and soil, and study the strengthening of plant roots to soil.
Analysis of Platform on Piles Application on Deformation Control of Underground Pipe in Reclamation Areas
Authors: Zhou Dong Ni , Shang Qin , Xiao Bi
Published: July 2014

At coastal beach soft soil area, reclamation projects may have great effect on the deformation of the existing underground pipeline. In this paper, the engineering specification method and the finite element method are used respectively for the pipe deformation calculation of the application of platform on piles to handle such underground pipeline deformation control. The results show that the application of platform on piles can effectively diminish the settlement deformation of the existing underground pipe. Co mparing the two calculation results and the monitoring results, the finite element calculation results are more in line with the actual. By appropriately increasing the width of the platform and the pile spacing, the initial design program can achieve a more optimal solution.
Analysis and Process Control of the Deformation for Deep Excavation in Soft Clay
Authors: Liu Hui , Li Wei Bin , Liu Hong Tao
Published: July 2014

Mechanisms of the distortion of deep excavation in soft clay are recommended on the beginning. Plane FEA method is combined with back-analysis from displacement on this paper to establish a dynamic prediction system of the distortion of deep excavation, which is proved to be viable by practice. Combining with the idea of process control, a process control model of the distortion of deep excavation is established on this paper. It is divided into three parts: advance control, observation and dynamic prediction, process control in the construction.
Calculation for Earth Pressure of Cavity Expansion Considering Displacement
Authors: Zhang Wu Mei , Huang Xing
Published: July 2014

Most of the studies on cavity expansion are about the analytical solutions of the stress distribution, and not related to the effect of soil properties on earth pressure. Aiming at the problem, the change law of passive earth pressure is analyzed by using the Mohr-Coulomb model, and the formula of earth pressure is summarized. The error value of calculation and simulation is small that the formulas can be directly used in practical engineering.
Numerical Analysis of Stabilization of Slopes Overlying Bedrock Using Piles and Effect of Socketed Length of Pile on Stability
Authors: Bakri Mudthir , Xia Yuan You , Wang Hua Bing
Published: July 2014

Piles are used widely for stabilization of landslides. To stabilize a slope settled on bedrock with piles the required factor of safety must be checked, and pile should be designed properly. Piles should be socketed into firm rock to prevent uprooting or overturning .In this research it is aimed to look into the socketed length of pile in bedrock. Therefore the parameters that affect the factor of safety of slope/pile system such as location, length, spacing and diameter of piles are analyzed. The effect of socketed length of pile in rock on pile behavior is investigated by plotting the shear force and bending moment diagrams along pile. The optimal pile position is found to be located slightly upper of the middle of the slope. The minimum socketed length after which the factor of safety will be remained constant is found to be 0.12L where L is pile length.FLAC3D computer code based on finite difference method is used to simulate the slope/pile system.
Numerical Simulation Analysis of Bearing Characteristics on Super-Large Diameter Rock Socketed Pile
Authors: Gong Cheng Zhong , He Chun Lin , Zhu Ming Xing
Published: July 2014

Wujiang Bridge is located on the Wujiang River in Chongqing Province in China. Based on test method of numerical simulation, the bearing characteristics of this large-diameter rock-socket pile with super-thick pile caps have been analyzed, including pile foundation load-bearing characteristics, pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that Q-s curve of this kind of pile is approximate to linear. Under the action of ultimate load, the main load was supported by pile end résistance. And according to main stress distribution of pile cap, there is an obvious spatial truss effect phenomenon in it.
Prediction of Displacement Time Series Based on Support Vector Machines-Markov Chain
Authors: Xu Fei , Xu Wen Xiong , Wang Ke
Published: July 2014

A new displacement time series predicting model was proposed by combining the Support Vector Machines and the Markov Chain, which was named as Support Vector Machines and Markov Chain (SVM-MC) model. Through studying the measured displacement, SVM optimized by particle swarm optimization (PSO) was used to forecast the trend of macro development in roll. Markov chain was applied to compute State Transition Probability Matrix. By classifying system state and calculating absolute error and relative error between measured value and SVM fitting value, the predicting results are improved. The model was used on predicting displacement time series of a high slope of a permanent lock. The engineering case studies indicated that the model was scientific and reliable, and there was engineering practical value for displacement time series forecasting.
Reinforcement and Characteristic Analysis of Bolt Technology Applied in Bedding Rock Slope
Authors: Wang En Hua , Wang Zhi De , Jiang Li Min , Hao Luo , Ran An
Published: July 2014

Discrete element software is used to simulate the excavation of a rock slope in Puli-Xuanwei Expressway in Yunnan Province. Through monitoring displacement development characteristics in different positions of slope, the result shows that the minimum horizontal displacement under excavation exists in the top of the slope, meanwhile the maximum horizontal displacement occurs in the foot and waist of the slope, and the maximum vertical displacement occurs in the top of the slope. Comparing rock slope in such conditions as different stratum angles, directions, rock characteristics and thickness, it concludes possible failure modes of slope and the variation law of safety coefficient under different conditions. This paper is instructive and offers reference for the practical engineering.
Experimental Study on Engineering Characteristics of Basalt Residual Soil on High Slope
Authors: Cui Kai , Yang Ye
Published: July 2014

The basalt residual soil of high slope of BiWei highway in Guizhou province belongs to regional special soil. Comprehensive and systematic evaluation for engineering geologic characteristics of residual soil on basalt is necessary to the construction in this area and geological engineering investigation. Kaolinite is dominant in clay mineral of this soil, which has a higher clay particle content. The special material composition and structural morphology make it have the physical properties of high porosity, low density and high water content. But it has mechanical properties of higher strength. The soil has a low expansibility and weak water-resistance. Moreover, the soil is sensitive to environmental factors such as temperature and humidity. The mechanical properties become weak after soaking, leading to a larger collapse deformation and a heavy disintegration. Therefore, it is important to focus on the engineering disasters caused by rain water for example.
Simplified Method for Estimating the Inner Support and Internal Force through Stand Column Uplift of Foundation Pit in Soft Soil
Authors: Liu Yan , Liu Jun Yan , Liu Tao
Published: July 2014

In the excavation process of Foundation Pit in Soft Soil area, it will cause the large uplift of stand column, and may cause the instability and failure of foundation pit in case of being serious; but the additional internal force of support system caused by the uplift and sinking of stand column currently has no practical calculation model in the foundation pit design. This article discusses the reason and mechanism for uplift of stand column in the foundation pit, proposes the simplified calculation method of estimating the additional bending moment of inner support through uplift of stand column in allusion to two main influence factors of bottom heave and vertical load caused by the excavation of foundation pit, inversely calculates the permissible additional bending moment of inner support based on this, verifies by combining the monitoring data for uplift of stand column in the actual project, and finally, further proposes the project measures corresponding to the uplift of stand column, hoping to provide beneficial reference for the similar project.
Comparative Experimental Research of Soil Freezing with Pressure and Non-Pressure
Authors: Zhang Shi Yin
Published: July 2014

Use two kinds of soil, processes the uniaxial compressive strength test under the condition of pressure and zero pressure freeze, concludes different test results. That is the uniaxial compressive strength of frozen soil under pressure is higher than that without pressure, and laboratory test data as the basis for the design of the temporary support is relatively safe.
Slope Stability Evaluation Based on PSO-PP
Authors: Wang Ke , Xu Fei
Published: July 2014

Evaluation of slope stability is a complex system problem with uncertainties. Based on the Projection Pursuit (PP), the Particle Swarm Optimization (PSO) and the Logistic Curve Function (LCF), a new model for evaluation of slope stability is developed, which is referred as Projection Pursuit based on Particle Swarm Optimization (PSO-PP). The model, on the one hand, uses PSO to optimize the projection index function and the parameters of LCF. Thus it would ensure the accuracy of the parameters used in the model. On the other hand, the nonlinear relationship between projection values and empirical grades is established according to LCF. The test results of the model show that the model has a very good precision. In this study, the evaluation results obtained by applying the model developed here into Jinping I site hydropower plant are well consistent with the practice situation. It indicates that the model here is feasible and effective in the evaluation of slope stability.
The Application of Origin Software in the Data Processing of Rock Creep Experiment
Authors: Gao Chun Yan , Niu Jian Guang , Gao Quan Chen
Published: July 2014

The rheological experiment is one of main methods in studying rock’s long-term mechanical properties, with the characteristic of mass data and numerous relevant parameters. In this paper, the data of surrounding rock’s rheological experiment in Zhuji Coal Mine roadway is processed by Origin software, including drawing the creep experiment curves, taking derivatives of curves and then drawing the curves of creep rate and acceleration, curve fitting and parameter estimation, etc. The results show that the data it does not need to programme when using the software to process and it is convenient and time-saving with high precision and is worthy of popularization and application.
Three-Dimensional Numerical Analyses of Pile Response due to Braceded Excavation-Induced Lateral Soil Movement
Authors: Li Lin , Hu Xiao Xin , Dong Guang Hui , Liu Ju
Published: July 2014

Using the explicit finite difference code FLAC3D, the behavior of pile adjacent to braced excavation is investigated. The Modified-cam clay constitutive model was employed to model the non-linear stress-strain soil behavior, and the pile was assumed to have linear elastic behavior. The interface model incorporated in FLAC3D code was used to simulate the soil/pile contact, The built-in 'fish' language was used to calculate the data demanded. The pile response such as pile deflection, bending moment and lateral soil pressure were studied, and it is shown that the pile response is different from that caused by the excavations which are unstructted. In "standard" problem, the effect of different pile head constraints on the pile response was investigated, the effect of lateral displacement of the wall, distance from the excavation face, pile stiffness, pile length and axial load on the pile response are also investigated when the pile head is constrained from deflection. The research finding was compared with other published case history and reasonably good agreement was found between them.
3D Finite Element Numerical Analysis for Stability Calculation of High Steep Rock Slope
Authors: Xie Xiao Feng , Liu Yuan Liang , Han Jia Yong , Xing Liang
Published: July 2014

Due to the high steep rock slope stability analysis its complex geological conditions and other factors, its stability calculation has been a technical problems the field of slope engineering, in this paper, 3D finite element calculation software Midas GTS for side slope surface topography and slope internal faults, weak structural plane of complex three-dimensional geological modeling, it overcomes the complex slope geological modeling problem and simulates rainfall, earthquakes and other factors affecting the stability on the slope, calculated results more in line with reality, and the software calculates is in accordance with fact, it provides a useful reference for slope engineering.
A Certain Foundation Pit Support Design and Construction in Baotou
Authors: Bao Xian Kai , Que Meng Hui
Published: July 2014

We adopt the supporting scheme of soil nailing wall by comparison and selection combining engineering geological conditions and surrounding buildings load situations. And introduce focally its supporting principles and major parameters and main construction points. The scheme meets the engineering requirements proved by the construction acceptance inspection with its safe and rational design and construction convenience.
A Study on Micro Pile Reinforcement Technology for the Accumulative Landslide of Expansive Soil
Authors: He Hui , Xu Yue , Huang Zhao Zhao , Li Zhi
Published: July 2014

This paper studies the micro pile technology for the accumulative landslide reinforcement of expansive soil, putting forward the three failure modes of the micro pile strengthening accumulative landslides of expansive soil and design principles of the micro pile, and then illustrating its calculation methods. Those finding have been applied into 22 landslide disasters for the micro pile design, landslide treatment engineering in south mountainous area of Shaanxi Province in China, which attaches theoretical and practical importance to the design and treatment of micro piles reinforcing the same type of landslide.
Analytical Solution for Contaminant Extraction Using Well Injection Depth Extraction Technology Considering the Effect of Smear Zone
Authors: Wang Heng Yu , Tang Xiao Wu , Gan Peng Lu
Published: July 2014

The smear zones are usually caused by the installation of vertical drains in fine-grained soil. An analytical solution for contaminant extraction using well injection depth extraction (WIDE) system considering the smear effect was developed. The injection rate was assumed to be equal to the retrieval rate to maintain full saturation and steady-state seepage flow. The results obtained by the proposed analytical solution agree well with those obtained from the finite element method. An illustrative example was presented to show the influence of the smear zones and results reveal that the smear zone can have a great influence on the contaminant extraction from soils. The 500-hour base concentration of acetone in the middle of the contaminated soil increases by a factor of approximately 1.9 when the effect of the smear zone is considered in the model.
Double-Row Composite Anchor Bolt Design and Construction Monitoring Analysis of Green Building
Authors: Li Hong Xia , Wang Yong Wei , Fang Gao Kui
Published: July 2014

Zhengzhou East Green high-speed rail block D6 site supporting of deep foundation pit engineering, double row pile composite retaining structure design and data analysis. Through specific examples of projects, based on the measured data shows that support form of the rationality and practicality.
Experiment Research of Rock Anchor Foundation on Sandstone Ground in Transmission Line
Authors: Zhang Yan , Zheng Wei Feng
Published: July 2014

Rock anchor foundation can be widely used for the practical transmission line engineering in mountain areas. On strong-weathered sandstone ground, ten sets of uplift static load test of single rock anchor foundation were carried out. Based on the testing results, the typical failure modes and the ultimate uplift bearing capacity of foundations were obtained. Internal force distribution and effective anchorage depth were investigated through stain measurements. Design parameters of rock anchor foundation on sandstone ground were proposed, which can provide a reference for transmission line engineering design.
Explanation of Phenomenological Characteristics in Seepage Force Concept System
Authors: Shen Yang , Du Wen Han
Published: July 2014

Soil mechanics has been developed for a long time and its concept system is basically complete. But there are still some concepts not being defined clearly. The unclear concepts of seepage force are stated from three phenomenological characteristics aspects in this paper. The difference between loaded object and calculated range is cleared. The contact rule of solid phase and liquid phase is illustrated. The mathematical meaning of seepage force is clarified. Though judging the critical hydraulic gradient of soil flow on surface of cohesionless soil, the difference and correlation of the soil particle and clod analysis based on the phenomenological characteristics will be illustrated.
Mechanics Analysis of Flexible Base Pavement Structure
Authors: Su Li Ya
Published: July 2014

With the rapid development of traffic cause in our country, the operating requirement of driving load factors to pavement structure become higher and higher. The Semi-rigid base asphalt pavement structure exposed some defects and shortcomings, so the study of flexible base asphalt pavement structure is put on the agenda under the circumstances.Based on the research achievements at home and abroad of the existing asphalt pavement structure , choosing different elastic modulus and thickness to calculate and analyze the flexible base by ANSYS, gaining the law and trend of mechanics response (the vertical displacement and tensile stress) about pavement structure for the flexible base pavement of each layer foundation to provide the design reference.
Monitoring Analysis and Safety Evaluation of Deep Foundation Pit under Complex Conditions
Authors: Zhang Xu Tao , Zhang Qiang Yong , Wang Chao , Wang You Fa
Published: July 2014

The horizontal displacement of pit top and horizontal displacement in deep soil of underground garage deep foundation pit in Radio and TV centre of Shandong province was analyzed. Combing the deformation control value of foundation pit, we thought that the supporting structure was safe and reliable. The supporting structure could not only meet the strength requirements but also meet the deformation control requirements. This deep foundation pit was a successful case under complex conditions. Analyzing the variation rules between monitoring data and construction time, the instructive conclusions were obtained. The deformation of foundation pit external corner was largest. The external corner should be avoided in foundation pit. The dynamic loads around foundation pit had a great influence on the safety and stability of pit. The rainfall was disadvantage factors, so the construction of foundation pit should keep away from the rainy season. The foundation pit floor could limit soil deformation and improve the safety of pit. The pit floor should be constructed as early as possible.