bluuebunny/crossref_metadata_2025 huggingface dataset:
End Effects of Symplectic Solution to Stokes Flow in a Rectangular Cavity
Authors: He Shi Hua , Zhang Li Xiang , Cao Liang
Published: June 2012

The end effects of symplectic direct solution to Stokes flow in a rectangular cavity are considered. Based on establishing the dual equations for Stokes flow in Hamilton system, the non-zero eigenvalues and their eigensolutions for an anti-symmetric problem were obtained. Expanding the solutions of dual equations by non-zero eigensolutions and determining the expansion coefficients by the end boundary conditions, the decay tendency and interaction mechanism of end effects were discussed and the end boundary errors were investigated. The resultant velocity caused by tangentially driving lid is gradually decayed along the longitudinal direction of cavity. The more number of the expansion items are superposed, the more accurate the solutions are. The smaller the depth-to-width ratios are, the stronger the interference between the end velocities is. The error of ends moving in the same directions is bigger than that in opposite directions.
Mechanical Behavior Study on Connections of Multibarrel Tube-Confined Concrete Column with Steel Beam
Authors: Xu Li Ying
Published: June 2012

In order to meet the necessity of the code for seismic design of buildings: Principle for strong connections and feebleness member. The exernal steel tube of column and steel beam are joining with three kinds of style. Containing two strengthen styles T-style stiffening plate and appending haunch. The result reveals that the two strengthen connections ultimate load are much bigger, good ductility, better seismic behavior. The deformation of the column and the region of the connection is smaller when it was broken, Indicating the connections’s globality is better and the stiffness is bigger. It avoids brittleness for breaking styles when they are given more load.
Shear Resistant Strength Analysis of Construction Formwork Concrete Shear Wall
Authors: Liang Yong Duo , Sun Zhi Guo , Jiang Jin Zheng , Chi Gong Cai , Jiang Yue
Published: June 2012

Construction formwork concrete shear wall is one of new type of structural system. In order to study the shear resistant strength of construction formwork concrete shear wall, 21 quasi-static test results were collected, influence factors which affect the shear resistant strength of construction formwork concrete shear wall through grey-correlation analysis method were analyzed. It is found that, among the influence factors, axial compressive force is the most important, secondly is the effective height of the wall, the distance among stiffening ribs in the latitudinal direction show small influence. And the expressions to estimate the shear resistant strength of construction formwork concrete shear wall were proposed by regression analysis method.
Flexural Behavior of SRC Columns under Axial and Bilateral Loading
Authors: Zhang Shi Ang , Zhao Zuo Zhou , He Xiao Gang
Published: June 2012

A nonlinear analysis program based on fiber model was developed and used in analyzing the flexural behavior of steel reinforced concrete (SRC) columns under axial and bilateral loading. Concrete different confinement levels for different zones in a SRC column section, such as cover concrete zone, stirrup confined concrete zone and steel confined concrete zone, etc., can be considered. Some SRC tested specimens were simulated using the developed program. It was pointed out that the flexural capacity will be lower-estimated if the concrete confinement was neglected.
Vertical Isolation Research of Rubber Bearing in Series with Disk Spring
Authors: Rong Qiang , Sheng Yan
Published: June 2012

The isolation of horizontal ground motion is usually considered in the base isolation. However, the influence of vertical ground motion is not enough considered. The rubber isolation bearings install in series disk spring. The isolation layer parameters and the corresponding mechanical model are proposed. The vertical isolation effect of the new system is remarkable by analyzing example.
Numerical Analysis of Composite Wind Turbine Blade Considering Failure Behavior
Authors: Wang Man , Bai Rui Xiang , Shen Yan An
Published: June 2012

The paper studies the failure of the 3-D complicated configuration composite turbine blade by applying failure criterion. This failure criterion considers three kinds of different failures. They are matrix tensile/compressive failure, fiber- matrix shear failure and fiber failure. By Using FEA software ABAQUS, the stiffness degradation and failure behavior of the turbine blade of composite structure were studied. The failure and stiffness degradation of the two analysis models were conducted by typical numerical examples as well.
The Behavior of Column during Constrained Buckling Process
Authors: Wu Xiu Gen , Zheng Bai Lin , He Peng Fei , Liu Shu Guang
Published: June 2012

The elastic Euler buckling of an inextensible column is confined in a plane, and subject to fixed end displacement, in the presence of rigid, frictionless side-walls which constrain overall lateral displacements. The whole deflection is divided into some typical columns because of the symmetry. The governing equations of constrained buckling mode and deflection about axial load are deduced, based on linearized differential equation of beam. Point and line contact models are introduced to describe the behavior of the column in constrained buckling process, including load capacity, buckling wave and reaction force. The analysis on the deflection of column is helpful to the research about possible post-buckling paths.
Study on Analysis and Design of Structure Transfer Storey in Business-Living Building
Authors: Zhang Chong Yang , Bian Guang Sheng , Liu Na , Sa Li
Published: June 2012

The analysis process on four types of structure transfer storey of a high-rise business-living building is introduced. Based on the successful control of the capability of the whole structure, diverse parameters are compared including bearing-lode and economic parameters. Further analysis is made to the optimized structure transfer storey. Design suggestions are proposed about the structure transfer storey scheme selection finally.
Research on Key Issues in Design of Outer-Plated Steel-Concrete Continuous Composite Beams
Authors: Chen Li Hua , Xiao Fei , Jin Qi Liang
Published: June 2012

Based on the theoretical analysis and testing results, some key issues in design of outer-plated steel-concrete continuous composite beams are discussed. The influence of the form of steel beam upper flange on the behavior of composite beam is analyzed. The requirements about longitudinal reinforcement strength in the concrete flange of the negative moment region are given. It is suggested that the moment-shear interaction should be neglected when calculating the flexural capacity of outer-plated steel-concrete composite beams under negative bending moment. The behavior of longitudinal shear resistance at the interface between the concrete flange and web of composite beam is studied, and the related calculating formula is put forward based on the structural features of the composite beam.
Analysis on the Interfacial Dilatancy Effect in Anchorage Zone of Grouted Bolts
Authors: Guo Ying , Zhu Guang Yi , Jiang Xin Liang , Song Zhi Fei
Published: June 2012

The interfacial mechanical characteristics in anchorage zone of grouted bolts influence the ultimate capacity of bolts directly; a push-out test was carried out at the lab to study the interfacial mechanical characteristics in the case of bond failure happening at the grout-rock interface, leaned from some scholars to test methods for analysis of concrete microstructure instead of rocks. The commercial finite element software ANSYS method was adapted to analyze the dilatancy effect on the concrete during the grout was pushed out. Using conversion between compressive strength and tensile strength of concrete cube, the tensile strength can be calculated, as the basis for destruction of the concrete matrix.
Dynamic Response Analysis of Steel Rope Impact on Asymmetric Twin Tower Building with Large Bases
Authors: Wang Qiong Fen , Yao Ji , Wang Hui Min , Guo Chun Li
Published: June 2012

The FEM model of asymmetric twin tower building with large bases was established with FE-program ANSYS. The influences of steel rope on the structural dynamic characteristics were analyzed. The x-direction level seismic excitation were input with the help of time-domain analysis method, the influence of steel rope on the top’s acceleration ,the bottom shear force and bending moment of the structure were researched. Some useful results were obtained.
Optimization of Cold-Formed Channel Sections Using Imperialist Competitive Algorithm
Authors: Kohandel Roya , Abdi Behzad , Shek Poi Ngian , Tahir M.Md. , Kueh Ahmad Beng Hong
Published: June 2012

The Imperialist Competitive Algorithm (ICA) is a novel computational method based on the concept of socio-political motivated strategy, which is usually used to solve different types of optimization problems. This paper presents the optimization of cold-formed channel section subjected to axial compression force utilizing the ICA method. The results are then compared to the Genetic Algorithm (GA) and Sequential Quadratic Programming (SQP) algorithm for validation purpose. The results obtained from the ICA method is in good agreement with the GA and SQP method in terms of weight but slightly different in the geometry shape.
Optimum Design of Pile Raft Foundation on Pile-Soil Interaction
Authors: Wu Su Juan , Xiong Zhong Ming , Xu Yuan Gang
Published: June 2012

At present, great progress had been achieved in the theoretical research of pile-soil interaction. The principle for “main structure, secondly calculation” was traditionally adopted in engineering practice, “Full pile layout” and “Equal capacity pile layout” were still the basic pile layouts. An optimal unification was not reached among economy,safety and reasonable of building, plenty of capital and material were wasted,and unsafe hidden dangers were showed in engineering.Therefore, influences of raft thickness and different pile layouts for raft settlement and pile top reaction were analyzed by ANSYS in this paper,mechanical behavior and interaction mechanism beteewn pile raft foundation were researched. Pile raft foundation was designed optimally by using the optimization method of pumping pile. Finally, many significant conclusions were put forward.
Finite Element Analysis of the Pull-Out Specimens of Steel Reinforced Lightweight Concrete
Authors: Zhang Jian Wen , Guo Shi Hui
Published: June 2012

Finite element analysis method of steel reinforced lightweight concrete pull-out specimens is exploded based on the test results. Spring element and local bond slip constitutive relation are introduced in analysis so as to consider the interfacial bond-slip between steel and lightweight concrete. Element tributary area and flange or web position should be taken into account in order to confirm the spring element real constant. Analysis results indicate that specimens bearing capacity and deformation can be well simulated adopting the stated method and constitutive relationship.
Modeling for Initial Post-Buckling Analysis of Laminated Plates and Shells by FEM
Authors: Han Cheng Shuang , Zhang Hong Mei , Cheng Zai Ling
Published: June 2012

Nonlinear analysis of plate and shell structures can explain the phenomenon which cannot been explained by classical stability theory, and can obtain better validation of experimental results. Stability problems are essentially nonlinear and their nonlinear finite element solutions ultimately result in solving nonlinear algebraic equations and nonlinear eigenvalue problems. The solutions can define the shape of basic path and determine critical load by using the incremental method, The perturbation methods are used near the critical point, and the basic formulas are given for initial post-buckling analysis by FEM.
Study on Load-Carrying Performance of Short Axially-Loaded Column with Gusset Plate between Double Cold-Formed Thin-Walled C Steel
Authors: Chen Ming , Sun Yang
Published: June 2012

Technical Code for Design of Cold-formed Thin-wall Steel Structures mainly provides single-limb and lattice sections of axially-loaded members of cold-formed thin-walled steel, and there is no related design method for compound section. In this paper, combined the relevant test datas, the load-carrying performance of short axially-loaded column with gusset plate between double cold-formed C steel were analyzed through effective width method from code and DSM. By comparing the computing results with test results, it indicates that the computing results of DSM are more consistent with the test datas. As a result, I come up with suggestion formulas of effective width method which are applied to short axially-loaded column with gusset plate between double cold-formed thin-walled C steel.
The Multi-Objective Optimization under Random Loads
Authors: Wang Xian Jie , Zhang Xun An , Lian Yeda
Published: June 2012

Structure optimization seeks to achieve the best performance for a structure while satisfying various constrains such as a given probability. In the traditional mathematical model of structure optimization, the goal and the restraint functions are given without considering the randomness of the structural system. In this paper, the random loads and strength are described by probability method, the structure reliability is considered as objective function. Using the genetic algorithm, the mega-sub controlled structural systems is multi-objective optimization designed based on the structure reliability under random excitation, combined with the probability density evolution method for evaluation of extreme value distribution. A low-cost and high-performance structure is getting.
Experimental Study of Pile Foundation Dynamic Testing Used in the Anchor Rod Nondestructive Testing
Authors: Zhang Li Wei , Shi Wei , Zou Yu Na , Zhu De Sheng
Published: June 2012

The dynamic testing of stress wave reflection method is an easy, economical, rapid and reliable nondestructive testing technology and has been perfected used in the pile foundation dynamic testing. Anchor rod is more in line with the wave theory of one-dimensional elastic rod than pile foundation whether to theory or the geometric solid, material, stress state and other factors. The quality of anchor rod is determined by using small strain method (hammering method) of pile foundation dynamic measurement. Four testing anchor rods with different length and integrity were made in project of "China Marine Sport School", stress wave time domain curve of anchor rod was obtained by ZK-7E portable intelligent testing of piles instrument, defect location, length of anchor rod and integrity reflected by measured waveform are consistent with the actual situation, the method using pile foundation dynamic testing technology for anchor rod nondestructive testing is proved feasible and reliable.
Experimental Study on the Static Performance of Joints in the Castellated Portal Frame of Light-Weight Steel
Authors: Su Yi Sheng , Zheng Shu Fang , Li Qi Liang , Quan Jin Yun
Published: June 2012

In order to study the mechanical behavior of joints in the castellated portal frame of light-weight steel under static loads, a static loads experiment has been performed for these new joints in this paper. The experiment members include four castellated joints and one solid-web joint of original steel, considering three vary parameters which are connection form of joints, joint region with setting stiffener and the distance from the center of hole to joint region. Experiment shows: the stiffness of castellated joints is higher than the one of solid-web joint. The parameters have a great influence on the mechanical behavior of joints, except the connection form of joints.
Experimental Investigation on Vertical Tension Property of Laminated Rubber Bearings
Authors: Zhang Zhi Qian , Chen Shi Cai , Yan Wei Ming , Ren Xiang Xin
Published: June 2012

In order to study the vertical tension properties of laminated rubber bearings under different shear strain, pure tension test and shear-tension test on two groups of natural rubber bearings and lead core rubber bearings with 800mm diameter are present in this paper, and the initial stiffness, yield stiffness and yield stress and ultimate tensile properties (limit stress, limit strain) of the rubber isolation bearing in different shear strain are analyzed. The results of the tests provide the reference for the application of rubber bearings on large-scale complex structures or high building structures.
Finite Element Model Updating of a Steel Jacket Scale Model
Authors: Li Zhi Gang , Li Ying Chao , Wang Shu Qing , Yang Bin
Published: June 2012

In this paper, the finite element model of a steel jacket scale model is updated using modal parameters identified by modal test. Updating parameters are selected based on sensitivity analysis by solving modal energies. And then, a two-steps updating process is carried out using different parameters and the Cross-Model Cross-Mode (CMCM) model updating method is applied in each step. Results indicate that with selection of updating parameters and sensitivity analysis, CMCM method can update the finite element model with physical meanings.
Research and Application of the Combined of SWMM and Tank Model
Authors: Sang Guo Qing , Cao Sheng Le , Wei Ze Biao
Published: June 2012

Hydrologic Model is the basic tool of simulation of the runoff generation and confluence of the basin. It is widely used in the research of hydrologic process of the drainage basin. In this paper, the characteristics of SWMM Model and Tank Model were introduced. The SWMM-Tank model was established that combined with advantages of the SWMM and Tank model. This model was used in hydrological simulation of the Big Ning river basin. The Surface and Underground runoff was simulated respectively using the SWMM model and Tank model. The simulation results show that the SWMM-Tank model can meet the requirement of accuracy and the combined model is simple. The combined model can be used in hydrologic simulated of the drainage basin that the underground information is lacked.
Development and some Prospects of the Shaft Lining Structure
Authors: Wu Lin Lin , Lian Yong Guang , Kong Yong Xiang , Ma Yong Jun , Jiang Bin , Li Yang , Li Yan Ying
Published: June 2012

The damage mechanism and causes of the shaft lining structures are introduced, and the advantages and disadvantages of some current shaft lining structures are analyzed. The prospects of steel plate-high strength concrete composite shaft lining structure are proposed in this paper.
Calculation & Analysis on Integral Mound-Lifting System of Shear Wall Construction in High-Rise Building
Authors: Wang Fan , Zeng Yun Sheng
Published: June 2012

Kingkey building in Shenzhen is a kind of tube in tube structure which consists of outer tube and reinforced concrete core tube. The outer tube is composed of CFST columns. The article introduces the design idea and theory of the whole mould-lifting system during the work progress and analyses the security and global stability of steel platform and support columns in the system during the different construction stages, which is combined with the structure of the core tube and the construction characteristics.
Experimental Study of Blind Bolted Joints to Concrete-Filled Thin-Walled Steel Tubular Columns under Cyclic Loading
Authors: Wang Jing Feng , Chen Xin Yi , Hou He Tao
Published: June 2012

This paper discusses results of experiments on blind bolted end plate joints to concrete-filled thin-walled steel tubular (CFTST) columns. Four exterior joints to CFTST columns subjected to cyclic loadings. A feature of this novel joint is the use of the blind bolts and extensions to these bolts into the concrete-filled square steel tubular column. Failure modes, moment-rotation hysteretic curves and energy consumption of the connections were analyzed. Further, the connection rigidity and ductility were also elevated by present specifications. The test results showed that the end plate type and the steel tube thickness affect the seismic behaviour of the typed blind bolted end plate joints. The proposed joint has reasonable strength, stiffness and ductility by taking reasonable end plate type, steel tube thickness and blind bolt anchorage; its ultimate connection rotation satisfies the ductility design requirements, and could be reliably and safety used in low-layer or multi-layer composite frames.
Deformation-Based Nonlinear Finite Element Analysis of Steel High Performance Concrete Structural Walls
Authors: Kaize Ma
Published: June 2012

Base on the experiment results of steel high performance reinforced concrete (SHPRC) structural walls, nonlinear finite element(FE) analysis is performed to simulate the complete process of the loading and concrete crack of SHPRC structural walls in the platform of ABAQUS. The nonlinear of material is taken into account in the models. The reliability of the finite element model is verified through the comparison of the analysis results and the experimental results. Based on the proposed model, the parametric analysis is carried out to study the effect of axial load ratio, aspect ratio, stirrup characteristic value, and steel ratio on the seismic behavior of SHPRC structural walls. It is concluded that the bearing capacity of SHPRC structural walls increase with the increase of the axial load ratio, but the deformation decreases obviously. The deformation and bearing capacity of the structural walls are improved by increasing the steel ratio. With increasing the stirrup characteristic value, the deformation of the structural walls improves significantly. The stirrup characteristic values are proposed to ensure the SHPRC structural walls for different axial load ratios meet the deformation capacity of drift ratio of 1/120,1/100 and 1/80, respectively.
Analysis of Cable Force Loss of Prestressing Structure during Tension Construction
Authors: Zhao Xiao , Fang Hong Qiang
Published: June 2012

Suspen-dome structure is a new type of large-span space structure, however, cable force loss at the joint during prestressing construction becomes big issues. To solve this problem, study has been done on this issue. ANSYS finite element software is used to simulate friction at the joint and its effects on cable force distribution and overall performance of the structure. Further analysis of reduced scale model test has been done, of which the results meet well with the theoretical calculation results.
The Research on the Improved Genetic Algorithm and Optimized Based on the Random Functional Analysis
Authors: Xia Zheng Bing , Cao Zhi Xiang , Zhang Ke Feng
Published: June 2012

The optimization problem of building structure has the technical difficulties of nonlinear, discrete, indifferentiable and nonconvexity character, the traditional algorithm based on MATLAB can not solve practical engineering optimization problem accurately. Based on general genetic algorithm is as the foundation in this paper, the theory basis of modified algorithm is applied based on the application of functional analysis and analyses the genetic algorithm for the iterative characteristics is analyzed, and the three stem rod calculation is verified based on application of functional analysis improved genetic algorithm, which solves the optimized design of common rod technical problem and achieves good calculation accuracy and efficiency.
Frame Column of the Limit Value of Axial Compression Ratio of
Authors: Tong Zhi Neng
Published: June 2012

In the current specification of the pressure ratio limit requirement is not specific, not fully consider the impact of seismic design of frame column ductility of other factors. According to the influencing factors of column ductility analysis, reached standard of axial pressure ratio limit values in most cases are conservative, may be appropriate to do the relaxation adjustment conclusion.
Three-Stage Approach for Unrestrained Simply Supported RC Slabs under Uniformly Distributed Load
Authors: Liu Jun Xian , Tan Kang Hai
Published: June 2012

It is known from previous experiments that the load-carrying capacity for RC slabs at large deflection is governed and enhanced by the tensile membrane action. However, due to the intrinsic complexity of concrete properties, it is hard to capture the history of the load-deflection relationship for RC slabs. After reviewing several analytical reinforced concrete models, the author develops a simplified load-displacement semi-analytical model for laterally unrestrained simply supported RC slabs. Three stages have been identified for this model, which are elastic stage, transition stage and pure tensile membrane action stage. Compared with the existing RC slab tests, the author's model shows good agreement with the previous test results.
Experimental Study on the Behavior of Two-Way Concrete Slab under Furnace Loading
Authors: Yang Zhi Nian , Dong Yu Li
Published: June 2012

This paper describes the results of a furnace test conducted on two-way concrete slab with clamped edges. The details of clamped support condition, arrangement of reinforcement, position of displacement transducers and thermocouple trees are described. Detailed experimental data in the form of describing slab cracking, the temperature distributions within the slab, vertical deflections and horizontal displacements are presented. The experimental results show that the temperature distribution along the slab depth was nonlinear and the temperature gradients in the slab were large. Extensive cracks occurred on the top surface of the slab and formed in an elliptical pattern. It is shown that two-way concrete slab with clamped edges has good fire resistance.
Nonlinear Analysis on Square Steel Tube Filled with Steel Reinforced High Strength Concrete Subjected to Bi-Compression Bending Load
Authors: Ouyang Wei
Published: June 2012

This paper presents a nonlinear analysis of square steel tube columns filled with steel reinforced concrete subjected to bi-compression bending load. Calculated results agree well with the tested results. Further, Different parameters of members were analyzed using nonlinear analysis procedure. Results showed that Slenderness ratio, stirrup ratio and eccentricity ratio have tremendous influence on capacity and initial stiffness. Steel reinforced ratio and eccentricity angle have secondary influence on capacity and initial stiffness.
Influence Line Analysis of the Plane Trusses Based on EXCEL
Authors: Zhao Ming Bo
Published: June 2012

The purpose of this paper is to investigate the application of Excel software in the constructing and plotting of influence lines in plane trusses. Obtaining the influence coefficient of the plane trusses with Excel, the influence lines in the plane trusses were constructed and plotted via VBA Functions in Excel. The research outcome of this paper is expected to be helpful to engineering practice, teaching and research work. Key words: EXCEL；plane trusses；influence line；VBA
Natural Element Method for Material and Geometrical Bi-Nonlinear Problems
Authors: Ding Dao Hong , Zhang Qing , Xiao Jiang Qing
Published: June 2012

Based on the Voronoi diagram of some nodes, the natural element method (NEM) constructs the shape functions by the natural neighbor interpolation method, and its shape functions satisfy the Kronecker delta property, which makes it impose essential boundary conditions easily. Based on the geometrical nonlinear relations and material nonlinear constitutive relations, we extend the NEM to material and geometrical bi-nonlinear problems in this paper. Numerical examples show that the NEM is effective, rational and feasible in dealing with problems of both material and geometrical bi-nonlinear.
Application of Finite Element Method for Nonlinear Analysis in Reinforced Concrete Structures
Authors: Zhou Ming Rong
Published: June 2012

Finite Element modelling (FEM) has been expounded with the introduction of concrete materials constitutive relationship model.Meanwhile, bearing capacity of simply supported concrete beam is simulated by adopting FEM software-ANSYS through the whole computation process. Moreover, results of computed values and experimental values are compared demonstrating that related nonlinear analysis and treatment can be done well in this approach.
Fault Diagnosis System of Rolling Bearing Based on Wavelet Analysis
Authors: Wang Li Na , Wang Hong Bo , Cai Yong Hui , Wang Shi Long
Published: June 2012

According to the characteristics of fault vibration of rolling bearing (non-stationary signals), a method of fault diagnosis based on wavelet analysis is put forward. In the method, the signals included faulty information of rolling bearing are decomposed and reconstructed by Matlab software, and by zoom frequency spectrum analysis, the fault information composition of the rolling bearings can be extracted effectively to determine the faulty type of the rolling bearings. Based on the above, an applicable fault diagnosis system for rolling bearing with surface damage in friction pair was developed. It has been proven by practice that the diagnosis method of system is surefire and its results are stable and reliable. Through being improved and expanded，the system can be applied to collect and analyze other vibration signals.
Seismic Behavior Analysis of Beam-Column Joints of Steel Structure Semirigid
Authors: Ge Yanhui , Su Guo
Published: June 2012

In order to study the seismic behavior of steel frame structure, based on the verification of the finite element program, two different end-plate connections under monotonic load and cyclic load are analysed with the finite-element software ANSYS, considering geometry, material and status nonlinearity. Some parameters such as height of endplate, array of blot, diameter of blot are analysed to study their effects on the seismic behavior of beam-to-column end-plate connection, the bearing capacity of the joint of the framework, the initial rotation stiffness, the ultimate turning power, power-wasting capacity and ductility. The results show that reasonable connection have better power-wasting capacity and ductility , so it can be applicated in multiple-story steel frame structure.
Using Artificial Neural Network to Predict Blast-Induced Ground Vibration
Authors: Gao Fu Qiang , Wang Xiao Qiang
Published: June 2012

Prediction of peak particle velocity (PPV) is very complicated due to the number of influencing parameters affecting seism wave propagation. In this paper, artificial neural network (ANN) is implemented to develop a model to predict PPV in a blasting operation. Based on the measured parameters of maximum explosive charge used per delay and distance between blast face to monitoring point, a three-layer ANN was found to be optimum with architecture 2-5-1. Through the analysis of coefficient of determination (CoD) and mean absolute error (MAE) between monitored and predicted values of PPV, it indicates that the forecast data by the ANN model is close to the actua1 values.
Seepage-Stress Analysis on Oilfield Based on Numerical Simulation
Authors: Liu Jun , Wang Xing Feng , Chang Xue Ping
Published: June 2012

Using the finite element software ABAQUS, the stress field in one low permeability reservoir is investigated. Genetic algorithm is used to determine the initial stress boundary of the reservoir, seepage-stress element CPE4P in ABAQUS is used to model the rock and beam element B31 is used to model the well group. The numerical simulation results indicate that casing damage can be predicted effectively using the method in this paper.
2-D Flood Routing Simulation on the Lower Yellow River from Huayuankou to Jianetan Based on Mike21 Software
Authors: Zhang Xiao Lei , Li Xiao Juan
Published: June 2012

The Lower Yellow River is apt to deposit and migrate. The reach from Huayuankou to Jiahetan is the typical wandering reach, which has broad and shallow body, intertwined tributary and numerous shoals. The mainstream always swings, and the riverbed deforms rapidly. There exist lots of residential places, irrigation canals, roads, productive dikes and other controlling works within the embankments, which greatly limits the scope of flooding. When the peak discharge is very large, the flood is prone to resulting in productive dikes bursting, which will greatly endanger the lives of residents in flood plains. The 2-D water flow mathematical model which reflects flood routing in the reach from Huayuankou to Jiahetan has been developed based on MIKE 21 software in this paper. Through the numerical simulation of the “96.8” typical flood, the simulating results in the condition of present topography are agreement with the measured ones. It shows that this model is basically reasonable in the selection aspects of river terrain, boundary treatment, roughness and water flow parameters, and the model has a reference value.
Stability Analysis and Treatment of a Landslide Engineering Along a Highway
Authors: Yang You Lian , Xie Fei Hong , Wu Qi Hong , Wan Si Ming
Published: June 2012

This paper describes landslide rock-soil structure characteristics and physical-mechanical properties on the left side of a roadbed, and landslide formation mechanism and harm were analyzed in construction, with the transfer coefficient method and finite element method, the stability of the foundation and structures were evaluated, the stability coefficient and surplus sliding force of landslide were calculated, according to the calculation results, treatment measures are proposed, and the landslide stability were made comparative analysis before and after treatment, and that valuable experience and lesson were gained, which provide a strong basis for the landslide recognition and design, at the same time has a certain reference value for similar landslide governance.
Experimental Study of Rock Mechanics Parameters in the Elastic Deformation Stage at Different Strain Rates
Authors: Liang Chang Yu , Li Xiao , Li Shou Ding , He Jian Ming , Wang Sheng Xing , Guo Jing Yun
Published: June 2012

Rock mechanics parameters are important during engineering investigation, design and construction, especially elastic modulus and Poisson’s ratio. According to the end point of initial fracture compression stage and elastic proportional point of stress-strain curve, the elastic deformation stage was determined; then the modulus and Poisson's ratio of rock at different strain rates were calculated by use of the average method. The results indicate that elastic modulus of rock increases with increasing strain rates; Poisson's ratios are scattered, but also present increasing trend.
Vertical Vibration Amplification of a Saturated Fractional Derivative Type Viscoelastic Soil Layer
Authors: Wen Min Jie , He Hui Tuan
Published: June 2012

Regarding the soil skeleton as viscoelastic medium with fractional derivative constitutive behavior, the influences of the soil skeleton viscosity and the soil layer thickness of saturated fractional derivative viscoelastic soil layer on the vertical vibration amplification coefficient is studied in the frequency domain by using the theory of Biot and one dimensional wave. The analytical expressions of the displacement, stress and pore water pressure of saturated soil layer are obtained by decoupling dynamic control equations and bounding the soil layer boundary conditions. The influences of physical and geometrical parameters of the saturated soil on vertical vibration amplification are investigated, and it is revealed that the vertical vibration amplification of the saturated classic elastic, fractional derivative type viscoelastic saturated soil and saturated classic viscoelastic soil are different when the soil layer thickness are changed; the material parameters of the fractional derivative model have great influences on the vertical vibration amplification coefficient.
Numerical Solution of Axisymmetric Problem for an Elastic Footing
Authors: Zhang Jia , Hou Xing Min , Wu Li Xiang
Published: June 2012

Based on formulas of elastic mechanics, the axisymmetric problem applied to an elastic footing is analyzed. Using Hankel transform and finite difference method, the arbitrary points’ displacement and stress solutions of the axisymmetric elastic footing problem is obtained. Compared with recursive substitution method and transfer matrix method, this method is simple because it avoids complex formulas and exponential function calculation. The half space model is more flexible to simulate an actual footing. The numerical solutions are compared with Boussinesq’s Equation and results show that finite difference method is applicable to solve axisymmetric elastic footing problem. But in the application of finite difference method, there are a few factors that could cause calculation errors. Effective measures are needed to obtain exact solutions.
Whole Space Comprehensive Advanced Geological Forecast Technique in Shallow Buried Section of Tunnel
Authors: Lei Ming Feng , Peng Li Min , Shi Cheng Hua
Published: June 2012

A new method named whole space comprehensive advanced geological forecast technique was constructed by surface spatial differential detection method combining with TSP203 system, the former can divide the distribution region, burial depth and thickness of each stratum from vertical direction clearly, and the letter can reveal the specific physical property of each stratum from horizontal direction, then combining both of them, the geological condition will be determined accurately. And then, this technique was tested and applied in a project as an example, the plan-validation results show: the formulations crossed by tunnel are full ~ strong weathered slate with rock broken zones, abundant groundwater and potential slip surface, even more, the range between crown and spandrel has irrupted into the gravel clays, all of these are unsafe for tunnel construction and suggest to have pre-supporting by 40 m Φ108 pipe shed. By comparing the results of prediction and in-situ, the whole space comprehensive advanced geological forecast scheme which avoids complexity of scheme, shortens forecasting cycle and reduces detection cost and construction interference, has encouraging forecast effect and significant popularization value.
BP Artificial Neural Network Study on Slop Stability
Authors: Zhang Bao Jian , Yang Guang Qing , Xiong Bao Lin
Published: June 2012

Based on the introduction of Artificial Neural Network principle and analyzing steps, a neural network for slop stability prediction is built in this paper. Intrinsic factors and external factors of slop stability are considered in the network, through building, training and testing the BP network model, we can see that the BP network model can analyze and determine the stability of slop; the forecasting accuracy is high and we can use it as the decision basis of slop stability analysis.
The Research on Geological Characteristics of the Dafosi Coal Mine Company 40110 Working Face
Authors: Han Jia Ming
Published: June 2012

40110 working face is arranged as the third Mechanized sublevel caving mining face in the 401 east-wing area along the coal seam by Dafosi company of the Binchang Mining Group Corporation. According to the conclusion based on the research about Binchang area coal geology not only shows the roof and floor lithology, structure, hydrology, the gas, dust features and so on but also proposes mining roadway supporting schemes and putting them into practice. Practical application shows that roadway supporting schemes effectively control the two-sided displacement and relative movement of the roof and floor to ensure the daily production of coal mine.
Analysis of Slope Stability Based on Gaussian Process Regression
Authors: Zhang Yan , Su Guo Shao , Yan Liu Bin
Published: June 2012

Slope stability estimation is an engineering problem that involves several parameters. Artiﬁcial Neural Network (ANN) and Support Vector Machine (SVM) have been successfully used in slope stability problem. However, there are some open issues for above-mentioned methods, which are very hard to overcome. For this reason, Gaussian Process Regression (GPR) which has a theoretical framework for obtaining the optimum hyperparameters self-adaptively has been used in slope stability problem. Without complicated mechanics computation process, through learning the empirical knowledge coming from real engineering, the complicated nonlinear mapping relationship between slope stability and its influencing factors was established easily using GPR. The results of test study indicate that the method is feasible, effective and simple to implement for slope stability evaluation. The results are better than previously published paper of ANN and SVM.
Interrill and Rill Erosion on Hillslope
Authors: Liu Gang , Xu Wen Nian , Zhang Qiong , Xia Zhen Yao
Published: June 2012

Interrill and rill erosion are commonly observed erosion processes to coexist on hillslope. Understanding of the interrill and rill erosion process is the key for the development of physically-based erosion prediction models. This paper reviewed the research progress of interrill and rill erosion, and the relationship between them. The shortages were also put forward. Finally, the trends for future development and questions are also discussed.
Analysis for Surrounding Rock Instability and Research for Stability Control Technology in Underground Engineering
Authors: Bao Xian Kai , Li Yi
Published: June 2012

Aiming at the surrounding damage and instability in underground excavation and operation, an analysis of surrounding rock damage modes and an exploration of damage mechanism are done and an conclusion of control principles and means for surrounding rock deformation and damage is made in the thesis. The result dovetailed with engineering and provides reference for engineering design and operation.
Stability Analysis and Research of the Underground Air-Raid Shelter under the Proposed Site
Authors: Zhang Zhi Pei , Yang Bo , Liu Qiang , Meng Ting
Published: June 2012

There existed an underground air-raid shelter group under the foundation of the proposed site, whose stability analysis and evaluation was the key problem on the safe use of the proposed site. Based on the engineering geological characteristics of the proposed site, the stability of the underground air-raid shelter under the present situation was evaluated and analyzed by the Pullman's Theory (unloading arch theory), meanwhile, the variety rule of the stress and strain of the underground air-raid shelter under the future situation was studied by the using of numerical simulation of Flac3d. Combined with the actual investigation, the results of analysis and study show that: the underground air-raid shelter is not stable under the present and future situation of the site, therefore, the relative measures must be taken.
Anti–Analysis of the Release Rate of Stress during the Tunnel Excavation
Authors: Mao Guang Xiang , Xia Yuan You
Published: June 2012

During the tunnel excavation construction, the internal stress of surrounding rock surface will release to zero immediately, and the displacement of the surrounding rock surface increases slowly because of the delayed strain of the rock material. Set the stress of the surface is easier then set the strain of the surface while numerical simulation of excavation in FLAC3D and other software. Based on the rock mechanics and excavation process, combined with on-site monitoring of the displacement data, use the FLAC3D software to establish study examples, use Genetic Algorithm optimize the weight and bias of the neural network, analyze the release rate of stress of surrounding rock under a reasonable construction time. It can provide the reference data for the tunnel design, construction and the numerical simulation analysis during construction under the similar conditions.
Research of Three-Exponential Smoothing Method in Tunnel Displacement Prediction
Authors: Pan Dan Guang , Yang Ming Chao
Published: June 2012

Prediction of tunnel surrounding rock displacement is a hot topic. To accurately predict the displacement of tunnel surrounding, we put forward three exponential smoothing method and describe its basic theory. Based on the measured displacement of a tunnel monitoring sections in Northwest area, compared with traditional regression analysis and grey model as GM (1, 1) to predict the displacement, the results show that the average error and variance about prediction of displacement using three exponential smoothing method is minimum. This method is suitable for the prediction of tunnel surrounding rock deformation and can be applied to practical engineering.
Research on Float Upward Point Values for Tunnel Uplift Hierarchical Control during Shield Tunnel Construction
Authors: Wu Di , Zhou Jun Hong , Zhou Shun Hua
Published: June 2012

The adverse effect of tunnel uplifit on tunnel structural stability and waterproof property is increasingly prominent, leading to engineering problems such as segments connection and damage. All these bring the construction quality down and make it difficult for operations and management. Based on the data obtained from monitoring the upllifit of the serrid measure sections in two intervals in Ningbo metro line No. 1, this paper studies the segments uplift by analyzing segment mortise structure features and float upward trajectory. The article considers the worst conditions according to the size difference in mortise, puts forward a method to calculate and integrate the slab staggering and segments opening based on the monitoring data, and then get two float upward point values. Finally, it is proposed that by updating and fitting the monitoring data, the tunnel uplift can be divided into three intervals, making it possible for dynamic and hierarchical control. The research results could provide reference for the shield tunnel construction.
Quality and Efficient Tunneling Technology in Xin San Mine
Authors: Zhong Cong Li , Guo Dong Ming , Tong Bing , Xue Hua Jun , Wang Yan Bing
Published: June 2012

The efficiency of our rock roadway is generally not high, January footage is generally around 60m, which greatly affected the normal mine production mining to succeed. Optimize the blasting parameters, support technology and strengthen the construction organization and management measures is to solve the Rock Lane embrasure low utilization rate, blasting the poor, loop footage and low problem. The experiments show that: the three new mines using the above measures, the rock roadway construction speed from the original 60 m per month to 120 m / month, improve efficiency of 100% quality and efficient excavation of the rock roadway to reach the test purpose. Of the success measures and methods to provide reference for other similar mine rock roadway quality and efficient construction.
Surface Settlement Law Induced by Shield Tunnel Excavation Using Modified Gap Model
Authors: Li Wen Bo , Wang Wen Pei , Tao Lian Jin , Zhang Yin Tao
Published: June 2012

GAP model will be modified and programmed by FISH language, which can be used in FLAC2D programs. The modified GAP model is used to study the variation of surface settlement shape with depth, the variation of the maximum settlement value with depth, and the variation of settlement gradient with depth. The results show that: the settlement shape is narrow and deep with the conditions of shallow buried depth of tunnel; on the contrary, the settlement shape is wide and shallow; When the tunnel depth is less than the critical value, the tunnel depth and the maximum surface settlement is approximately linear; when the tunnel depth is greater than the critical value, the curve of maximum surface settlement value with depth becomes flat and with the increase of the tunnel, the surface settlement gradient gradually decreases and eventually tends to zero. It is more reasonable to assess the influence of tunnel excavation near adjacent buildings, using the maximum surface settlement and the settlement gradient as a control standard.