bluuebunny/crossref_metadata_2025 huggingface dataset:
Hexahedron-Dominant Mesh Generation for Blocks with Constrained Triangulated Boundary Surfaces
Authors: Pei Xue Bin , Xu Neng Xiong
Published: July 2014

In the field of geotechnical engineering, a numerical simulation model is established by meshing a three-dimensional geological model, which is composed of many seamlessly connected blocks. Each block is enclosed with constrained, triangulated boundary surfaces and called as a constrained block. Due to the complexity of geological structures, a three-dimensional geological model is very complicated in most cases, and will be very difficult to decompose this kind of model into hexahedral mesh by those commonly-used methodologies. Thus, we propose a new mesh generation method which is special for blocks with constrained, triangulated boundary surfaces: hexahedron-dominant mesh generation based on templates (HMGT). In this method, several regular blocks including cuboids, prism, pyramid, tetrahedron, cylinder and their combinations, are decomposed into hexahedron-dominant meshes that serve as mesh templates. Then, a constrained block is abstracted into a simple block, and the simple block is divided into two parts by shrinking: the crust and core. Next, a mesh template of regular blocks or their combinations is selected and mapped to the core of the simple block, and the crust of which is filled with pyramids and tetrahedra in order to obtain the subdivision of the simple block. Finally, the mesh of a simple block is directly mapped to the original constrained block to generate target hexahedron-dominant mesh.
Novel Partitioned Integration Method Based on Newmark's Scheme for Structural Dynamic Problems
Authors: Jia Chuan Guo , Li Ying Min , Xia Hong Liu , Liu Li Ping
Published: July 2014

Systems of ODEs arising from transient structural dynamics generally exhibit high-frequency/low-frequency and linear/nonlinear behaviours of subsets of state variables. This paper resorts to the use of different time integrators with different time steps for subsystems, to tailor each method and its time step to the solution behaviour of the corresponding subsystem. Anovel partitioned integration method with the acceleration continuity is proposed whose velocity continuity is also ensured by means of the mass projection strategy. Both its stability and accuracy properties are examined through numerical analysis on Single-DoF split mass system.
The Analysis on Bearing Characteristic of Residue Pile Composite Foundation Formed by DDC
Authors: Liu Zeng Rong , Sun Qing Juan , Yan Zhi Fang
Published: July 2014

The bearing capacity of residue pile composite foundation formed by deep dynamic compaction, shorted for DDC, is calculated and analyzed by ANSYS finite element software. The analysis results show that pile body and soil between piles have a good coordination, residue pile composite foundation is semi-flexible and semi-rigid and the effect of consolidating foundation is obvious. The purpose of foundation treatment should be taken into consideration primarily to provide reference for future similar projects.
Dynamical Analysis on Underground Powerhouse of Yixing Pumped-Storage Power Station
Authors: Han Fang , Zhong Dong Wang , Mo Ji Yun , Chen Gui Juan
Published: July 2014

The vibration characteristics and vibration response under different load cases in the underground powerhouse structure of Yixing pumped-storage power station were studied by establishing three-dimensional finite element model. The harmonic and transient analysis methods were proposed to study the vibration response of the powerhouse structure under various generating unit dynamic loads and in transient process. The numerical results were evaluated according to the related rules and regulations. The result shows that the vibration response of the power house structure is in the limit of the rules and regulations and there was little chance of resonance.
Experimental and Finite Element Study on the Fatigue Growth of a Semi-Elliptical Surface Crack in a X80 Pipeline Steel Specimen
Authors: Jin Qiao , Sun Ze Yu , Guo Wan Nan
Published: July 2014

In this paper, a fatigue test of a X80 pipeline steel specimen with a semi-elliptical defect was performed to study the fatigue propagation stages of the Surface cracks. Based on the obtained test data, a three dimentional finite element procedure was developed for the crack growth estimation of the surface crack in the specimen. In the numerical analysis of crack growth, both the crack depth direction and the surface direction were investigated by using two different evolution equations. The stress intensity factors along the crack front were determined by applying the virtual crack closure technique. The predictions of crack growth were compared with the test data.
Finite Element Analysis on Negative Wind Pressure Stress of External Wall Insulation Layer
Authors: Zhang You Hui , He Li Ping , Zhang Ying Jun , Li Chen
Published: July 2014

With excellent flame retardation and thermal insulation properties, SY self-temperature regulation and phase change energy-saving wall insulation material (the material) is composed of concrete and volcano perlite. At present, applied research of this material is not very thorough,especially under the condition of temperature variation, seasonal wind change in North China. In this paper, finite element analysis of external wall insulation layer of the Experimental Teaching Building in Taiyuan University of Science and Technology under negative wind pressure effect is performed. The negative wind load calculated is applied to the surface of the thermal insulation layer as uniform load, and the results show that the material used in the building which shorter than 80 meters in the Taiyuan area has no shedding or destruction under the negative air pressure. This material is safe and available.
Mechanics Analysis of Tower Crane
Authors: Yang Zhi Jun , Ai Zhi Dan , An Hong Wei
Published: July 2014

With accelerating urbanization construction, especially with the scale enlargement of high-rise buildings, the crane’s hoist boom length and height is increasing.The hoist boom will produce strength and buckling failure easily on the working condition of complex combination, such as gravity, wind load and inertia force.The TC6010 crane was analyzed the mechanics by finite element method. This thesis got its stability and strength data in four kinds of working conditions. It can provide certain reference value for other crane’s design and calculation.
Crack Extension Calculation under Tensile and Shear Load by XFEM
Authors: Yu Miao , Dai Zhi Hong , Hu Gui Juan
Published: July 2014

The extended finite element method (XFEM) is a numerical method for modeling discontinuity such as cracks, holes, inclusions etc within a standard finite element framework. In the XFEM, special functions which can reflect the problem’s solution characteristics are added to the finite element approximation using the framework of partition of unity. Compared with the standard finite element method, it obtained more accuracy without remeshing. In this paper, we studied crack propagation behavior under different proportions of tension and shear loads by XFEM.
Numerical Simulation of Flow around High-Rise Buildings Based on Reynolds Stress Model
Authors: Zhang Zu Peng , Zhang Wei , Chen Guo Ping
Published: July 2014

In this paper, a modified inlet atmosphere boundary layer (ABL) which satisfies the turbulence model equations is applied to computational wind engineering. The new inflow turbulence boundary condition applied to simulating the flow in the cavity is verified that it is more in line with the actual flows, and then it is used to establish the numerical wind tunnel model to simulate the flow around high-rise buildings. The results are in good agreement with the wind tunnel experimental data, which show the modified ABL combined with Reynolds Stress Model (RSM) is able to better simulate the flow around high-rise buildings.
Reconstruction of Shallow Shells for Increase Bearing Capacities and Operating Characteristics
Authors: Stupishin Leonid U. , Kolesnikov Alexander G.
Published: July 2014

Bearing capacities and operating characteristics cover of a building deteriorate since time. Reconstruction of shallow shells cover by increase of their thickness in the center or at the edge. Critical force and stress of shell are considered with the geometric nonlinearity consideration. Vertical static loading and various types of a fixing are investigated. The method allows to describe various forms of shells with defects.
The Coupling of Pseudo-Spectral Method and Domain Decomposition Method for the Elastostatic Problem
Authors: Ding Rui , Chen Fu Jun , Shen Quan , Liu Ling
Published: July 2014

It presents the coupling of Pseudo-spectral method (PS) and domain decomposition method (DDM) for the elastostatic problem. First, the original problem is decomposed into several sub-problems by DDM. Next combining the advantage of easy programming and high accuracy of Pseudo-spectral method, we can solve these sub-problems in parallel by PS. Finally the global numerical solution is obtained by the partition of unity approximation. Some numerical experiments illustrate the effectiveness and accuracy of our method.
Numerical Simulation of the Wind Load on the Mast at Different Wind Angles
Authors: Cao Rong Sheng , Fang Yuan Yuan , Wang Ling
Published: July 2014

The wind load acted on ship mast at different wind angles of large Reynolds number is numerically simulated in this paper. CFX software was used to analyze the trend of constant and fluctuating forces that the mast surface suffered at different Reynolds numbers.The vortex shedding strength of the wind load around the mast was also analyzed according to the trend of Strouhal number varing with the simulated Reynolds numbers. The results show that the wind angle has an important impact on the lift, drag, and vertical force of the mast. The vertical force of the inclined side wall on the mast can not be ignored,and the angle of direction wind has great impact on the Strouhal number at different Reynolds numbers.
Simulation of Acoustic Cavitation Bubble Motion by Lattice Boltzmann Method
Authors: Zhou Xi , Shan Ming Lei , Zhu Chang Ping , Chen Bing Yan , Yin Cheng , Ren Qing Gong , Han Qing Bang , Tang Yi Bin
Published: July 2014

The motion characteristic of cavitation bubble is one of the major factors affecting acoustic cavitation. In this paper, a cavitation model coupled with acoustic pressure is established using lattice Boltzmann pseudopotential model. Aimed at demonstrating the feasibility of applying LB method in acoustic cavitation, the acoustic cavitation simulations are compared with the predictions of Keller equation. The comparison of theoretical prediction and numerical simulation shows that LB method is suitable for acoustic cavitation simulation.
Study on the Downburst Field Characteristics under the Influence of Two-Dimensional Continuous Mountains at Different Distance
Authors: Sun Yi , Wu Yuan Ze , Shi Hai Tao , Ji Bai Feng
Published: July 2014

Downburst is an outburst strong wind on or near the ground, and its wind field characteristics are significantly different from boundary layer winds. Continuous mountains at different distance are one of the main factors for the influence of downburst wind field characteristic. In this thesis, the changes of the wind field characteristics under the influence of continuous mountains at different distance after the downburst happened are studied by CFD numerical simulation. The impact of downburst is analysed and summarized through the charts.
Three-Parameter Damage Evolution for Quasi-Brittle Solids
Authors: Zhang Ji
Published: July 2014

This paper aims to investigate the performance of a new three-parameter damage mechanics model which describes three basic damage mechanisms of quasi-brittle solids: tension, shear, and hydrostatic compression. The stress is first decomposed into its positive part and negative part, and then the latter is further decomposed into its deviatoric part and hydrostatic part, whereby a three-parameter damage description is formulated. Through matrix representation of the tensor formulation, specific forms of the three-parameter damage theory are illustrated in various stress states. It is found that the proposed framework of three-parameter damage theory can inherit the existing two-parameter models and extend them to a broader scope of application.
The Studies of Rock Damage Softening Statistical Constitutive Model under True Triaxial Stress State
Authors: Zhang Hui Mei , Xie Xiang Miao , Yang Geng She
Published: July 2014

From the feature of rock micro-unit failure obeys Poisson random distribution, the damage softening statistical constitutive of was established under true triaxial confinement based on D-P criterion, so the impact of the intermediate principal stress on rock deformation and failure was considered in theory, and the actual engineering rock complex stress path evolution was reflected more realistically. Furthermore, according to the geometrical conditions of stress-strain relationship, the theoretical relationship between constitutive model parameters and the stress-strain curve characteristic parameters during the process of rock softening and deforming, which enhance the adaptability of the model. Finally, the rationality of the model verified by the measured data.
Research on SketchUp Application in Graphing of Civil Engineering
Authors: Dong Qiang , Yang Yong Shou
Published: July 2014

This paper introduces to the application of the software---SketchUp in teaching process, which will make the abstract graph visualize, inspire students’ interest and help them to have a better grasp of civil engineering structure. We use SketchUp to create models, assist the teaching of civil engineering Graphing and recognition, improve students’ space imagination and cultivate their creativity.
Building Information Modeling (BIM) and Analysis of more Traditional CAD
Authors: Li Jian
Published: July 2014

Building Information Modeling (Building Information Modeling) is the relevant information and data as the basis for building projects model, building model be established to simulate the real information through the building of digital information. It has five characteristics of visualization, coordination, simulation, optimize and can plot and so on. As the construction industry in a brand-new concepts and technologies, BIM has been increasingly used in various construction projects in the country. Building Information Modeling (BIM) provides a platform to complete the continuity and consistency of all information within the whole life cycle of buildings.
Research on Tunnel Construction Quality Based on Visualization Management
Authors: Li Qian
Published: July 2014

Through the comprehensive application of modern information technology, network technology and modern construction management 4D theory has carried out the systematic study on the implementation method of the tunnel construction quality information rapid collection, visual management, centralized control and highly sharing. Based on the development of tunnel construction quality information management system, by logging data of design, construction, monitoring, supervision and test during the construction period, digital network management would be achieved in the tunnel construction process. mainly to complete: 1) combined with 3D models and tunnel construction schedule, build a tunnel 4D model; 2) Take additional tunnel construction quality management information for 4D theory to achieve dynamic visualization of construction quality management and query; 3) through practical engineering applications, the system is proved innovation in the tunnel construction quality management.
Comparison Analysis of Buildings Settlement, Calculated in Accordance with Rheological Properties of Soils (Based on the Geotechnical Conditions of St. Petersburg)
Authors: Astafyeva Ekaterina
Published: July 2014

Soft soils are well represented as the foundation of buildings all over the world. Settlements of buildings that are built on soft soils are developing over decades and often uneven. This can cause structural damages to constructions and as consequence unplanned repairs or even collapses of buildings in general. To justify the use of different models of soil mechanics it is necessary to carry out their verification. Verification of the model consists of compliance to the simple laboratory experiments and of the adequacy of the field tests description. And the most important thing is that the results of calculations should be based on comparison between series of field observations. The principal difficulty of comparing calculation results with field observations is that the actual soil deformation is developing over a long time, and most of the calculation methods are aimed to obtain finite values of deformations. Comparison between data of finite deformations and data of field observations is not quite correct, because, as a rule, in-situ (field) observations recorded incomplete development process of deformations but not only the final result of settlement. Therefore, to compare these calculations and observations we should select calculation models that can examine the development of deformations in time. Based on the above, it is interesting to analyze the applicability of the most common engineering methods and calculation models of the soils that underlie different calculation programs used in practice.
The Soft Soil Foundation Consolidation Numerical Simulation Based on the Model of Modified Cam-Clay
Authors: Gu Xiao Jie , Zhou Tai Quan , Cheng Song
Published: July 2014

The clay layer finite element analysis model , which is established by using finite element program to simulate the embankment filling , takes the intercoupling between water and clay in drainage consolidation process into full account. The use of the effective stress principle consider the characteristics of clay such as nonlinerity , large deformation and so on ,carry out the plane strain finite element analysis on the clay and solve a series of engineering problems.
The Integration of BIM and the Reinforcement Information Expressions
Authors: Shen Chao , Li Da Hua
Published: July 2014

BIM (Building Information Modeling) as a new idea and technology, has been attached more and more attention in architecture and BIM is gradually changing the model of traditional 2D products images and decentralized design of construction process. This paper expounds the method of the integration of BIM and the reinforcement information expressions and its obstacles in the process of realization through the introduction of BIT technology.
Stability Analysis of Jinghua Gypsum Mine Golf in Jingmen City
Authors: Chen Cong Xin , Xia Kai Zong , Dong Yuan Bin , Liu Xiu Min , Huang Ping Lu
Published: July 2014

According to golf’s distribution and occurrence situation of Jinghua Gypsum Mine circumstances in Jingmen city, The golf is divided into general golf, filling golf, then the stability of column and covering layer of the two kinds of golf are analysed. It is shown that: For the general golf, A large range of column is stable within a relatively short period of time in the process of underground mining. it will be unstable for local small column because of it was bore weight of overlying strata. After the column was soaked, its strength will be greatly reduced, and the long term stability of column will not be guarantee. Complementary, the covering layer is basically critical stable state; For the filling golf, A large range of column is stable, and the covering layer is also basically critical stable state. It can promote the control of mining disaster and the protection of ecological environment and similar engineering with a high theoretical and practical value.
Analysis of Long-Term Deformation of Reinforced Retaining Wall Using Optical Fiber Sensor Geotextile
Authors: Lu Liang , Wang Zong Jian , Feng Huan , Arai Katsuhiko
Published: July 2014

Geotextile have been widely used in the reinforced retaining wall, but it is not easy to measure the deformation of the wall during and after construction. To assess the deformation stability of the reinforced retaining wall, an optical fiber sensor was used in geotextile. Based on the measurement accuracy of strain for the sensor geotextile, an actual geotextile-reinforced retaining wall was studied using the fiber sensor geotextile. The experimental results were compared with the results from a numerical procedure, which employs the Mohr-Coulomb yield criterion and an initial stress method and determines the plastic displacement at collapse represented by the distribution of yield elements. The comparison shows that the numerical results have a good agreement with the corresponding measurement values. The result shows the possibility that the procedure gives the realistic evaluation of long-term deformation of reinforced retaining wall.
Research on Water Temperature Change of Hot Dry Rock Fracture Storage Layer in Shenyang
Authors: Zhao Jian Bin , Song Hai Dong , Li Di , Zhang Zheng
Published: July 2014

Hot dry rock(HDR) provides heat through fracture storage layer. The purpose of research on water temperature change of hot dry rock fracture is to study that whether heat energy can satisfy five months winter heating or not. Research method is establishing model of hot dry rock fractured storage layer by means of numerical simulation software FLUENT according to the rock physical properties in Shenyang region. The depth of drilling is 4000m and the water flow rate is 1cm/s. Research principle is high temperature underground rock transfer heat to medium water in the fracture by coupling. Conclude water temperature change equation every two weeks. The results of the study is that fracture water temperature distribution can be approximated taken as linear distribution. According to the slope K, we can conclude water temperature change formula(3.10), and we can use it to infer fracture water temperature.
The Prediction of Northern Slope Deformation and Failure Caused by the Transformation of Open-Pit to Underground Mining in the Yanqianshan Iron Mine
Authors: Shao An Lin , Feng Hai Long
Published: July 2014

The Yanqianshan iron mine is preparing to transform from an open-pit mine to an underground mine. We adopt the non-pillar sublevel caving approach to exploit the particularly thick steep ore bodies within the range from -183 m to -500 m from top to bottom. According to the features of ore body distribution and the approaches of exploitation, we expect that underground mining will result in the loss of stability on the northern slope of the open pit, causing traction-type landslides. Moreover, along with increasing the depth of the mining operation, the range of slope failure will continue to expand and further affect the safety of drainage features and roads distributed on the north side of the open pit. For this purpose, we select four sections along the trending direction of ore bodies and apply the limit equilibrium method to predict the failure process and characteristics on the northern slope according to the stratified mining process.
Triaxial Test Study on Marine Sediments Sample with Simulated Combustible Ice
Authors: Wang Xiao Liang , Li Guang Fan , Du Juan
Published: July 2014

Combustible ice is a kind of efficient and clean energy that has the potential to be exploited in the future, exploiting combustible ice needs to understand its mechanical properties. Combustible ice is another important feature of soil which is different from soil, in order to correctly understand the distinction, this paper using soil mechanics triaxial test method, to study the mechanical properties of combustible ice. Different from previous study, this article put forward the concept of simulated combustible ice, namely through baking powder, sodium chloride, and Marine sedimentary soil to simulate flammable ice, explore a new method for sample preparation to study the mechanical property of combustible ice.
A Chemo-Elasto-Plastic Coupling Model for Sandstone Considering pH Effect
Authors: Li Xue Hao , Wang Wei , Tian Zhen Yuan , Xu Wei Ya
Published: July 2014

In this paper, we present a numerical modeling of chemo-mechanical behaviour of sandstone. An internal variable is introduced in this model for the purpose of describing pH effect on elasto-plastic properties. A new chemo-elasto-plastic model is proposed for sandstone. The proposed model is applied to predict material responses in triaxial compression tests of sandstone after soaking in different pH acidic solutions. We concluded with good agreement between numerical simulations and experimental data.
Experimental Study on Shear Strength of Different Types of Soil
Authors: Chen Hui Man , Guo Fei Hu , Zhou Xian Qi
Published: July 2014

Red clay belongs to region special soil.It has engineering geological properties that are different from general soils.The natural red clay has high ratio void ratio,high moisturecontent,low density and so on.But red clay has non-corresponding high strength,bearing capacity of foundation and low compressibility. With the high speed development of China economy,the main soil named red clay in South is used as bearing stratum of many building foundations.However,when red clay is used as foundation,it is regarded as gerenal clay to consider its bearing capacity of foundation.So this will cause two disadvantages.First,potential is not given full play,resulting in considerable waste.Second,red clay has some special properties,such as high woid ratio,softening in water.These properties will bring hidden troubles,causing some bad accidents.These are caused by lacking of knowledge to engineering properties.Xiamen locates in southeast of China,and red clay is widely distributed.It is formed by accumulation through laterization of granites and basalts.So it is essential to study red clay.In this article,literatures of red clay in Xiamen are collected.Indoor conventional geotechnical tests are done,some engineering property parameters are obtained.
Project Design of Dewatering for Deep Foundation Pit in Dalian
Authors: Guo Bai Liang , Liu Hong Bin
Published: July 2014

Tube well dewatering is widely applied in deep foundation pit for its large water discharge, good dewatering effect, simple equipment and easy maintenance. In this paper, rube well dewatering is designed for the temporary project of foundation pit according to the engineering characteristics and stratum and underground water distribution with the deep foundation pit engineering as the background. The required parameters and design process of well tube dewatering are illustrated, and experience of applying tube well dewatering in evacuation of deep foundation pit is accumulated, which will be of certain referential significance for similar projects.
Slope Early Warning System Design and Preliminary Practice
Authors: Xu Fei , Xu Wen Xiong , Wang Ke
Published: July 2014

Early warning thresholds for slope instability were discussed in this study by means of rheological tests and field measurements due to availability and effectiveness of the data. Five warning levels were specified to take proper measures in different emergent cases. The left bank slope of Jinping I hydropower station was studied as an instance to implement the strategies introduced in the study. The surface displacement thresholds were obtained by analyzing long-term observed displacements (the former three warning levels) and the rheological tests on the rock mass (the last two levels). The results gave out that the thresholds of surface displacement rate for different warning levels were 0.30mm/d, 1.15mm/d, 3.00mm/d and 5.00mm/d. These results could be potential references for other projects.
Study on Sheltering Effect of Underground Building to Horizontal Displacement of Retaining Wall of Foundation Pit
Authors: Liu Yan , Liu Jun Yan , Cai Shan Bing
Published: July 2014

Due to the existence of underground building, the distribution of displacement field of adjacent foundation pit is obviously different from that of general foundation pit, and it is of great significance to correctly understand the sheltering effect of underground building to displacement field for determining the protection class of foundation pit while supporting design of foundation pit, and protecting the safety of metro station built near and surrounding buildings during the construction. Relying on the foundation pit project of metro station and combining the sensitivity theory through mechanism analysis, this article discovers that the sheltering effect is most obvious when the spacing between the underground building and retaining wall of foundation pit is 0.5H, and the sheltering effect can be ignored when the distance is more than 2H.
Discussion on Treatment Technology of Reinforcement Pile in Karst Area
Authors: Zheng Cheng Bo , Xu Jie
Published: July 2014

With the example of pile foundation engineering in the limestone karst fissure reinforcement, discusses the principle of reinforcement of pile foundation in karst area, introduces some construction technology of pile foundation reinforcement, the reinforcement design principles and the reinforcement scheme is briefly discussed, and combined with the engineering practice and put forward a set of safety, economy and reasonable treatment plan, to reinforcement technology promote the karst pile foundation bottom cave, fracture.
Analysis on Deformation and Support Technology of Deep Soft Rock Roadway
Authors: Liu Yong Sheng , Liu Wang , Dong Xing Yu
Published: July 2014

The deformation and support technology of soft roadway is a very important problem in mine. Based on the roadway’s deformation of Jian Xin Mine of Jiangxi Fengcheng Mining Bureau, the mechanics mechanism and reasons of the soft rock roadway deformation are analyzed. And the three kinds of support technologies which are suitable for soft rock roadway are put forward. The support technologies have been used in the soft rock roadway of coal mine and have achieved good results. The research has important reference value for soft rock roadway supporting technology and its stability maintenance.
Application of Fuzzy Set Theory to Evaluate the Stability of Slopes
Authors: Mohamed Tarig , Kasa Anuar
Published: July 2014

An artificial intelligence tools, Adaptive Neuro Fuzzy Inference System (ANFIS), was used in this study to predict the stability of slopes. Data used in this study were 300 various designs of slope. Those designs were created by using Slope/W which calculated factors of safety using various limit equilibrium methods (LEM) such as Bishop, Spencer and Morgenstern-Price. The input parameters consisted of height of slope, H (1–10 m), unit weight of slope material, γ (15-22 kN/m3), angle of slope, θ (11.31°-78.69°), coefficient of cohesion, c (0-50 kN/m2) and internal angle of friction, (20°- 40°) and the output parameter is the factor of safety. To build the fuzzy inference system, 243 rules were used at 60 epochs. The number of membership function for the any input was three and the type of membership function for output was linear. ANFIS obtained regression square (R2) of one for Bishop, one for Janbu, one for Morgenstern-Price and one for Ordinary. The result proved that ANFIS may possibly predict the safety factor with good precision and nearly to the target data.
Cone Penetration Test Study of Ultra Soft Soil after Vacuum Preloading
Authors: Yu Jiong Qi , Li Hong Wen , Wang Wen Shuang
Published: July 2014

No sand cushion vacuum preloading method is one of the construction technology for treating the ultra soft soil formed with hydraulic fill at present. The practice is ahead of the scientific research work, as the effect detection technology of the surface-layer improvement is still in the stage of exploration. In this paper, the cone penetration test (CPT) is used to detect the effect of the surface-layer improvement of the ultra soft soil based on one case in Zhejiang province in China. The result shows that the cone tip resistance is at the range of 0.08 ~ 0.40MPa and the thickness varies about 1.5 to 2.2 m of the treated ultra soft soil. The cone tip resistance along the depth has two kinds of curve shape and four zones.
Defects Discrimination and Error Analysis of Wharf Bored Piles Detected by Low Strain Reflection Wave Method
Authors: Li Tao , Qiu Qing Chang , Wang Jing
Published: July 2014

Based on the field test of bored piles at wharf detected by low strain reflection wave method, time-history curve features and defect position of intact piles and defective piles contrastively analyzed, with verification of on-site drilled core testing. The reason for discrimination error between specific defect position and actual data when processing low strain reflection wave method are derived, based on the analysis of effect of defective piles strengthened by pressure grouting method retested by low strain testing, practical measures of on-site low strain reflection wave testing are purposed to improve detection accuracy.
Experimental Studies on Acoustic Emission of Different Damaged Concrete
Authors: Ji Hong Guang , Li Xu Rong , Song Cheng Lin
Published: July 2014

Through to conduct uniaxial compression test on concrete of suffering sulfate attack, the frequency characteristics of acoustic emission signal are analyzed in the corrosion concrete failure process. The results show that: the acoustic emission ringing counts show phases developmental rule with the relative stress increased.When the relative stress is low, acoustic emission signal of the damaged concrete S1 is intensive and large amplitude, while the acoustic emission signal of the no damage concrete S0 is active - relative quiet - active - relative quiet and the acoustic emission signal of the damaged concrete S2 is active - quiet - active.
Experimental Application of Fractal Theory into Selection of Subgrade Filling Materials
Authors: Wang Xi Gang
Published: July 2014

To investigate the settlement deformation of subgrades, we used fractal theory and soil section technology to study the original foundation soil, and soils filled with 4%, 8%, 12%, 16%, 20% and 24% of A material. The results show that under consolidation pressure of 500 KPa and after one dry-wet circulation, the fractal dimension was 1.7 in the original soil, 1.78 in the soil filled with 4% A material, and 1.93 in the soil filled with 24% A material. Along with the increased dopant amount of A material, the fractal dimension of soil mass gradually increased, but after the dopant amount reached 24%, the increasing rate was very slow. With the increased addition of A material, the compression deformation gradually weakened, but after the dopant amount reached 24%, the changing rate was very small. We derived a prediction model between the dopant amount at a certain particle size and the fractional dimension. This model can be used to predict the dopant amount at a certain size. The reasonableness of this model when using single size was validated via engineering practice.
Mechanical Model of Pile-Soil Work Together
Authors: Zhang Su Juan
Published: July 2014

Come up with of pile-soil-(foundation) pile cap interaction grounded upon penetration deformation of pile ends and compression of soil between piles. Hyperbolic model is adopted to simulate the development of tip resistance and side resistance in accordance with deformation to reflect the nonlinearity of pile-soil work, Boussinesq solution is utilized to calculate the stresses generated in soil by foundation (pile cap) plate, Mindlin stress solution is used to calculate the stress produced in the soil between piles by side resistance and end resistance, and the stress of soil is the superposition of the two solutions.
Influence of Density on the Hydraulic and Mechanical Properties of Sands
Authors: de Freitas Neto Osvaldo , dos Santos Jr. Olavo Francisco , Nascimento Flores Severo Ricardo
Published: July 2014

This article aims at assessing the influence of relative density on the hydraulic conductivity and shear strength of two sands, denominated S01 and S02, derived from different regions and formation processes. S01 is wind-blown and S2 alluvial. The results of characterization and hydraulic conductivity in constant head tests were presented for both samples. The results of direct shear tests with sand S01 prepared with 5 different void ratios were also presented, for a vertical stress of 100kPa. The S02 sample was prepared with 4 different void ratios and these underwent direct shear testing with vertical stresses of 25kPa and 150kPa. This sample was prepared with the maximum and minimum void ratio and submitted to strength tests at CD triaxial compression with confining stresses of 50kPa, 100kPa and 200kPa. Results showed that even with different grain sizes, and under different density conditions, there were no significant variations in the permeability of the materials. With respect to shear strength, sand S01 obtained higher angle of friction values than sand S02, even though the latter had a higher percent coarse fraction. Sand S02 was relatively similar in terms of friction angle values obtained in direct shear and triaxial compression strength tests.
Prediction of Composite Foundation Settlement Based on Multi-Variable Gray Model
Authors: Wang Yue , Yang Guang
Published: July 2014

In this paper, based on the principle of gray theory, MGM(1,n) multi-variable settlement prediction model was established. Combined with specific examples of projects, settlement of rigid pile composite foundation was predicted, and the prediction results are compared with both prediction results of GM(1,1) gray model which is currently comparatively mature and the settlement observation results. The study shows that it is effective to use MGM(1,n) multivariate gray model to predict composite foundation settlement.
Preparation of a New Type of Joint Filler and Study on Adhesion Performance
Authors: Li Xiao Wei , Sha Chuan
Published: July 2014

Aiming at a new joint filler for pitch concrete pavement, processing it in different condition of water, determining the tensile strength through tensile experiment, analyzes the effect of adhesion performance from joint filler in water surrounding; does analysis to the adhesion performance of the recurrent tensile test in identical water surroundings.It evidenced that the new joint filler is much less affected in water surronuding than rubber modified bitumen,which is made by CARFCO inUSA,what meas that the new joint filler is much better than rubber modified bitumen on adhesion performance.
Research of Soundless Crack with Different Number of Drillholes
Authors: Tang Lie Xian , Zhang Dong , An Zhen Tong , Zhang Jun Yan
Published: July 2014

The special advantages of Soundless Crack method are safety and environmental protection. Soundless Crack is widely used in stone exploitation, partly crack of brittleness materials such as rock and concrete, and backout of building in city. In these engineering, we must drill many holes for loading Soundless Cracking Agents, but the drilling cost is expensive including human cost and materials cost, at the same time need much time to drill these holes. So we hope to gain the best crack results at the minimum drillhole numbers. This paper used RFPA software to set up some models with different drillhole numbers, gained different failure process of models. Adopted different drilling plan will occur different results. We should drill more holes if we need partly crack smoothly. We can plan the number of drillholes based on our need if we can use RFPA to simulate the failure process before beginning.
Stability Analysis on Anti-Slide Pile to Reinforce Slope Based on ABAQUS
Authors: Gu Xiao Jie , Zhou Tai Quan , Lu Shi Long
Published: July 2014

The research uses the method of three-dimensional finite element analysis combined with the actual project application to study the slope reinforced by anti-slide pile. The research analyses the influence of reinforcement that the anti-slide exert on the soil and shows the changes of the sliding surface properties by establishing the finite element numerical model. The conclusion can be made that the ABAQUS finite element method is visual and practical. The study is of great benefit to the actual engineering.
Experimental Study on Bubble Curtain Technology Applied in Underwater Blasting Damping
Authors: Hu Hai Ying , Zhang Yu Cheng , Huang Zhong Min , Peng Chang Xue
Published: July 2014

With the further development of urban construction, engineering blasting has had a wide range of applications. However, its application environment has become more and more complex relatively. Underwater blasting, one of the applications of engineering blasting, has been increasingly used in construction of subsea tunnel and immersed tube in recent years though it has a complex influence on surroundings in operation. For the study of shock wave absorption technology of underwater blasting, this paper analyses the effectiveness of bubble curtain shielding technology used in the underwater explosion by field experiment. The test result shows that intensity of underwater shock wave approximately reduced by 80% after passing through the bubble curtain, which indicates that the bubble curtain can effectively reduce the shock wave pressure in water; vibration caused by shock wave in water approximately reduced by 20% after passing through the bubble curtain, which reflects propagation law of shock wave has changed due to the effect of the curtain.
The Optimum Design of Slope Angle Based on Critical Sliding Field
Authors: Sun Shi Guo , Yi Ya Nan , Cui Qin Huan , Jin Lu
Published: July 2014

The optimum design of final highwall is a multivariable and complex technical problem that every change in any factor will influence the stable state. Based on the history-case, this paper applied the critical sliding field to search the critical slip and evaluate the stability of slope with different geometric forms. Comprehensively compared the global and local slope stability and its economic benefits, finally achieved the optimum design of final highwall.
Theoretical Analysis on Underwater Vibrating Compaction Technology of Scattering-Filling Rubble Stone Layer
Authors: Fu Jian Bao , Yan Shu Wang , Chen Zhi Jun
Published: July 2014

This paper studied on the underwater vibrating compaction technology of scattering-filling rubble stone layer. At HongKong-Zhuhai-Macao bridge project, in order to satisfy the project time limit, underwater vibrating compaction technology with hydraulic hammer instead of conventional dynamic compaction technology was used to tamp scattering-filling rubble stone layer with no dead angle in a short time. Owing to the shortage of engineering example, the theoretical analysis was needed before field application. In this paper, the rubble stone layer and the vibration system were simplified to a mechanical model. Vibration system’s work on rubble stone was obtained by mathematical derivation, and effects of parameters were analyzed. The result shows that work on scattering-filling rubble stone layer increases with the increase of system quality, equivalent damping, exciting force and angular velocity and decreases with the increase of equivalent stiffness, water stiffness and buoyancy.
Monitoring and Analysis on the Supporting Structure for Deep Foundation Pit
Authors: Sun Hai Xia , Zhang Ke , Chen Si Li
Published: July 2014

This article mainly expounds the importance of in-situ monitoring on the construction process of deep foundation pit. Taking the deep foundation pit of some Shenyang metro station for example, the deformation features of the supporting structure and the internal and external of foundation pit is analyzed, according to the monitoring data of the fender pile displacement during the excavation of deep foundation pit. The conclusion is obtained that the timely and accurate in-situ monitoring information is necessary to guaranteeing construction safety. We should pay more attention to the excavation speed and exert the interior support timely during the excavation of foundation pit to avoid large deformation and danger. The analytical results of monitoring data shows that the whole stage of foundation pit excavation is stable and the fender pile with internal supports can guarantee the stability of foundation pit.
Research on the Construction Monitoring for Enclosure Structure of Working well
Authors: Liao Yuan , Zhan Jian Hui , Li Chen
Published: July 2014

Working well of nanjing city latitude three pass by river channel project is taken for example. Underground continuous wall was adopted in this project. Detailed monitoring scheme was formulated and lots of date was obtained by foundation pit. The monitoring data changed sharply analysis shows that the maximum horizontal displacement and the maximum strut axial forces is located near the excavation surface and along with the soil excavating. After structure construction, the change of deformation and internal force of enclosure structure gradually became stable. The theoretical analysis and test results are tend to be consistent. But this two have certain differences due to the influence of various factors.
Experimental Study on Bearing Mechanism of Jacked Pipe Pile in Sand
Authors: Wang Jia Tao
Published: July 2014

Study on bearing mechanism of jacked pipe pile in sand is useful of optimizing the pile foundation design, and the research of the regularity of side resistance and tip resistance of pile has a very important theoretical significance. In this paper, a new effective method is used to test the tip resistance of the jacked pipe pile during the press-in process, and then the side resistance can be deduced [1]. Based on the field tests, the inherent laws of interaction between pile and soil in sand is explored, which provides some theoretical basis for the pile foundation design and engineering application.
The Application of BP Artificial Neural Network in Geotechnical Engineering
Authors: Zhao Na
Published: July 2014

Based on MATLAB, the article apply BP artificial neural network theory on the forecasting problem of time sequence in geotechnical engineering, and find it is an effecting way to solve the forecasting problem of time sequence in geotechnical engineering.
On Fire Severity of Flammable Gas
Authors: Wu Wen Zhong
Published: July 2014

Flammable gases’s fire need more attention in spontaneous combustion study of coalmine. Their premixed combustion is modeled to deduce the corresponding temperature-time function. Basing on this function curve and Simon Ingberg’s early reports, their fire severity classification theory is established, including definition and equation of their fire severity, and definition of fire severity coefficient along with calculation of those coefficients of ordinary flammable gases. Applying this theory to a certain coalmine, calculate and audit fire severity of its 6 designed fire scenarios, in servitude to guidelines for fire protection technology there, and references for fire severity comparison among similar coalmines.
A New Geometrical Model of Fluid Flow in Rock Fractures for Valid Application of the Cubic Law
Authors: Zhu Hong Guang , Jiang Yao Dong , Yi Cheng , Xie He Ping
Published: July 2014

The cubic law (CL) is one of the most commonly applied physical laws for flow through rock fractures and fractured media, but many studies indicate that the CL is often not adequate. We investigate the establishment conditions of valid applying the “cubic law” to flow in fractures. A dimensional analysis of the N-S equations yields three conditions for the applicability of cubic law, as a leading order approximation in a local fracture segment with parallel walls. These conditions may not be met in many natural rock fractures as whole and demonstrate that the “cubic law” should be exactly applied in local segments (local cubic law, LCL). In this way, a new 2D discrete equivalent model for natural rough fractures is introduced, and its equivalent aperture and flow formulation are derived. By comparing the developed model and experimental results of different fractures, good accuracy was found, and the model was validated. The model could be useful for theory studies of flows through real rock fractures.