bluuebunny/crossref_metadata_2025 huggingface dataset:
A Coarse Grid Correction to Domain Decomposition Based Preconditioners for Meso-Scale Simulation of Concrete
Authors: Wu Jian Ping , Song Jun Qiang , Zhang Wei Min , Ma Huai Fa
Published: October 2012

Meso-scale simulation is one of the important ways to study dynamic behaviors of concrete materials, while most of the simulation time is used to solve the sparse linear systems. Because the discrete grid is three dimensional and is of large scale, iterations are the best solutions. But the convergence depends on the distribution of the eigenvalues of the coefficient matrix, to make the eigenvalues distributed more closely each other, it is required to adopt preconditioning techniques. In this paper, with the characteristics of the sparse linear systems considered, there provides a coarse grid correction algorithm, which is based on domain decomposition preconditioners and aggregation of sub-domains, with each aggregated into a single super-node. A linear system with small scale size is formed, which contains the global information and the solution is used to correct the solution components of the original auxiliary linear system. For incomplete factorization preconditioner parallelized with block Jacobi, classic additive Schwarz, and factors combination techniques, the experiments show that the presented algorithm can improve the convergence rate and the efficiency.
Nonlinear Dynamic Response of Piezoelectric Cylindrical Shell with Delamination under Hygrothermal Conditions
Authors: Yang Jin Hua , Chen De Liang
Published: October 2012

Abstract. On the basis of the nonlinear plate-shell and piezoelectric theory, the governing equations of motion for axisymmetrical piezoelectric delaminated cylindrical shell under hygrothermal conditions were derived. The governing equation of transverse motion was modified by contact force and thus the penetration between two delaminated layers could be avoided. The whole problem was resolved by using the finite difference method. In calculation examples, the effects of delamination length, depth and amplitude of load on the nonlinear dynamic response of the axisymmetrical piezoelectric delaminated shell under hygrothermal conditions were discussed in detail.
Nonlinear Forced Vibration Analysis for Thin Rectangular Plate on Nonlinear Elastic Foundation
Authors: Xiao Yong Gang , Yang Cui Ping , Hu Hui
Published: October 2012

In this paper, nonlinear forced vibration analysis for thin rectangular plate with four free edges on nonlinear elastic foundation is researched. Based on Hamilton variation principle, the equations of nonlinear vibration motion for the thin rectangular plate under period loads on nonlinear elastic foundation are established. In the case of four free edges, the suitable expressions of trial functions satisfied all boundary conditions for the problem are proposed. Then, we convert the equations to a system of nonlinear algebraic equations by using Galerkin method and they are solved by using harmonic balance method. In the analysis of numerical computations, the effect to the amplitude-frequency characteristic curve which due to change of the structural parameters of plate、the parameters of foundation and the parameters of excitation force are discussed.
Analysis of Image Texture Features Based on Gray Level Co-Occurrence Matrix
Authors: Chen Ying , Yang Feng Yu
Published: October 2012

Gray level co-occurrence matrix (GLCM) is a second-order statistical measure of image grayscale which reflects the comprehensive information of image grayscale in the direction, local neighborhood and magnitude of changes. Firstly, we analyze and reveal the generation process of gray level co-occurrence matrix from horizontal, vertical and principal and secondary diagonal directions. Secondly, we use Brodatz texture images as samples, and analyze the relationship between non-zero elements of gray level co-occurrence matrix in changes of both direction and distances of each pixels pair by. Finally, we explain its function of the analysis process of texture. This paper can provided certain referential significance in the application of using gray level co-occurrence matrix at quality evaluation of texture image.
The Properties of Case-Weight Model when the Row and Column of Design Matrix Simultaneous Mitted
Authors: Chen Zhi Wei , Xu Wen Ke
Published: October 2012

This paper studies that the properties of case-weighted model when simultaneous omission of the ith row and the jth column of design matrix X. In other words, basing on case-weighted model, this article obtains the relation of total-data model and select-mean-shift outlier model about regression coefficient, leverage and potency.
A Matching Theorem in FC-Spaces with the Application to Coincidence Questions
Authors: Wen Kai Ting
Published: October 2012

A Ky Fan type matching theorem for weakly transfer compactly open valued mappings is established in FC-spaces. As applications, Fan–Browder type fixed point theorems and Ky Fan type coincidence theorems are obtained in FC-spaces.
A Remark on Invariant Scrambled Sets
Authors: Huang Lin , Wang Huo Yun , Wu Hong Ying
Published: October 2012

By a dynamical system we mean a compact metric space together with a continuous map . This article is devoted to study of invariant scrambled sets. A dynamical system is a periodically adsorbing system if there exists a fixed point and a periodic point such that and are dense in . We show that every topological weakly mixing and periodically adsorbing system contains an invariant and dense Mycielski scrambled set for some , where has no isolated points. A subset is a Myceilski set if it is a countable union of Cantor sets.
An Equation Involving the Smarandache Function
Authors: Chen Bin
Published: October 2012

For any Positive Integer N, LetΦ(n)andS(n)Denote the Euler Function and the Smarandache Function of the Integer N.In this Paper, we Use the Elementary Number Theory Methods to Get the Solutions of the Equation Φ(n)=S(nk) if the K=9, and Give its All Positive Integer Solutions.
An Improved Algorithm of Histogram Equalization to Increase Brightness of Image in Mine
Authors: Yuan Yan Bin , Zhang Bo , Yuan Xiao Hui , Zhang Xiao Pan , Xia Wen Zhao , Chen Ying
Published: October 2012

To improve the contrast ratio and brightness of video surveillance image in mine, we modify the histogram equalization algorithm by extent the boundary when calculating the sum of gray probability. Experimental results show that the algorithm can reserve the characteristics of the histogram equalization and improve the image’s brightness.
Positive Radial Solutions for Elliptic Systems with Nonlocal Conditions
Authors: Xie Sheng Li
Published: October 2012

By using fixed point index theory,we study the existence of positive radial solutions and multiple positive radial solutions for the elliptic system with nonlocal conditions. Our results extend and improve some existing ones.
Design and Implementation of the Simulation Model of a Certain Communication Gateway
Authors: Zhou Quan Zhi , Qiu Chuan Fei , Zhang Wei , Liu An Ping , Han Hong Liang
Published: October 2012

In this paper, by using Windows Socket, network communication, VC++ programming and etc., the design and implementation of a simulation model of communication gateways get realized. This paper realized the functional requirements of the communication gateway in the system where it located, and perfectly simulated the functions of communication network protocol processing and conversion, data packet encapsulation and distribution and other functions, which provided a solid theoretical and practical basis for the development of communication gateway.
Rules of CST Blunt Edge Roundness and the Influence on Collision Characteristics
Authors: Lei Zheng Bao , Yang Lan , Lei Mu Xi
Published: October 2012

This study is based on UG and finite element simulation software VPG and LS-DYNA to simulate,finally get how the automotive quality,impact speed and angle influence on rounded cutting edge rules of CST and collision characteristics .So provide a strong basis to the application of CST and car safety.
Integrated Design of Control/Structural Systems Based on Genetic Algorithm
Authors: Xu Bin , Zhang Yi Li , Yao Shu Xian , Jiang Jie Sheng
Published: October 2012

The integrated optimization of structure and control systems is investigated for 2-D single structure using a typical planar frame taken from a building. The vibration control model is established for the plane frame, and the LQR algorithm is used to obtain equivalent stiffness and damping parameters of assigned passive controllers. The integrated optimization model, including design variables, the objective function and constraint function, is built. The design variables are the size parameters of structural elements, the parameters of the weighted matrix, the number and locations of the controllers. The maximal displacement of the controlled system in time domain is introduced as the objective function. Genetic algorithm is adopted to solve such a kind of optimization problem with discrete and continuous design variables. The results of a numerical example show that the proposed method is reasonable and effective for the integrated design of control/structural systems subjected to seismic load.
Estimation Based on Expectation Theory
Authors: Zhu Jun Tao , Sun Chang Yu , Jiao Yuan Yuan
Published: October 2012

The theory of expectation estimation is put forward to discuss the estimation quality of the expectation domain. It is demonstrated that the “validity” criterion of the estimation theory in mathematical statistics (named classic estimate later) isn’t right and arithmetical average value x isn’t the best estimate. The means of characteristic value estimate (N (0, 1) estimate) is suggested to demonstrate the expectation estimate domain.
The Influence of the Convective Terms Discretization Scheme on the Simulation Results of Architectural Numerical Wind Tunnel
Authors: Wu Jian Feng , Wang Cai Hua , Song Chang Li
Published: October 2012

The numerical simulation of construction is to obtain the desired accuracy. It depends on the theoretical basis of the calculator and selection of the various important factors in the actual operation. For this problem, this paper adopting the current code for the design of building structures as the comparison standard, using the FLUENT software, taking the numerical simulation results of a high building’s wind load shape coefficient of for example, discussing the influence of four kinds of the convective terms discretization scheme, respectively the first-order upwind, the second order upwind , power law and Quadratic upwind interpolation for convective kinematics, on the simulation results of architectural numerical wind tunnel, provides the reference for the rational use of numerical wind tunnel method.
A New Method of Sensitive Analysis Based on the Weighted Inverse Topological Change Method
Authors: Liang Ping , Zhang Qiang , Wei Jun
Published: October 2012

Using the weighted inverse theory of matrices and the weighed inverse topological change method of finite element structures, a set of formulae used in the sensitivity analysis of the parameters of a structure are presented. Combined with the previous work of the author, it can analyze the static modification of the structures efficiently. The all formulae of this method are explicit ones and have advantages of simplicity and easily operation on the computer. An example is given to demonstrate the valid and the efficiency of the formulae.
An Advanced Multi-Objective Genetic Algorithm Based on Borda Number
Authors: Zou Jin , Wu Yong Gang
Published: October 2012

When applied to Multi-Objective Decision Making (MODM), genetic algorithm is plagued with two problems: how to appreciate non-inferior solutions and how to store them. Using Borda number as the fitness of a chromosome, an advanced Multi-Objective Genetic Algorithm ( MOGA) is provided in this paper, which can solve these problems in an easier way; and with the characteristic of Genetic Algorithm (GA) of producing a number of feasible solutions, this approach is able to obtain the set of non-inferior solutions without information of the decision-maker’s preferences. Finally, a simulated example to apply this algorithm to a multipurpose reservoir’s operation is provided, indicating the feasibility and effectiveness of this advanced MOGA.
Motion Simulation of Dual-Frequency Vibrating Screen
Authors: Hou Yong Jun , Fang Pan , Liu Qi Yu , Liang Jun
Published: October 2012

In order to reduce screen plugging and screen pasting, improve the efficiency of screening, a kind of dual-frequency vibrating screen was introduced. It had been used three exciting motors. We established the mechanical model of this vibrating screen, and used Matlab-simulink software to analyze the trajectory changes of screen surface, influenced by mass moment rate, initial phase differences and installation position between high and low frequency exciting motors. The results of the study indicate that, the rate of mass moment and difference of initial phase angle have great influence on the motion trail pattern and amplitude of vibration of the screen, and the installation position of high-frequency exciting motor have less influence on screen surface trajectory under the condition of exciting motors’ parameters given in this article. When designing dual-frequency vibrating screen, we can use the method of this paper to select appropriate rate of mass moment, difference of initial phase angle and so on, and achieve the expected motion trajectory of vibrating screen.
A Novel Image Registration Approach With SIFT Algorithm and Tangent-Cross-Point Feature
Authors: Song Zhi Li
Published: October 2012

By the aid of Tangent-Cross-Point feature, a novel improved SIFT algorithm is proposed in this paper. This method is more efficient and reliable in some cases, since it adopts Tangent-Cross-Point feature to improve the efficiency and robustness of SIFT algorithm. With a pair of matching feature points and a pair of curves nearby, it’s very easy to estimate the values of local transformation parameters and validate the correctness of this matching by the aid of Tangent-Cross-Point feature.
Simulation and Implementation of HLA-Based Branch Predictor of Multi-Pipeline Processor
Authors: Ye Ji Hua , Xie Qi , Xiahou Yao Hong
Published: October 2012

Researched how the multi-pipeline processor accelerates the running of thread ,found that when the branch predictor facing the random branch instruction, the hit rate will become very low, so bring out a new method that using the free pipeline to accelerate the running of branch instruction. If the right prediction from branch predictor is less than 70% and there is a free pipeline, then using two pipelines to run the two sides of a branch instruction at the same time. In order to test the new method, the HLA (High Level architecture) architecture-based simulation system is established, the results show that the new method can really reduce the time when processing the random branch instructions.
The Finite-Element Analysis of Characteristics of Soil Slope Seepage Field Change in Rainstorm Condition
Authors: He Zhong Ming , Wu Wei , Zeng Ling , Cai Zhong Xin
Published: October 2012

A numerical model was built by Finite Element software,discussed the effect of rainfall on slope pore water pressure、volatile water content and depth of infiltration in rainstorm condition. The results indicated that: (1)the variation of slope surface pore water pressure is more significant and the depth of infiltration is larger with the increase of rainfall intensity on the condition of fixed rainfall duration;(2)The slope section appears three pore water pressure divisions: transient saturated zone、negative pressure region and hydrostatic pressure area after the rainfall.
In Situ Measurement of Ground Vibration Induced by Inter-City Express Train
Authors: Liu Quan Min , Zhang Xun , Zhang Zhi Jun , Li Xiao Zhen
Published: October 2012

On the basis of the measured ground borne vibration of some inter-city express railway viaduct, test results analysis shows that: the test environmental vibration is under the limit set by standard of environmental vibration in urban area; whether transverse or vertical vibration, a rapid attenuation of the peak acceleration with the distance to the up-track center is observed, however the vibration at 7.5m appears to be amplified; the ground vibration with the distance conforms to a logarithmic relationship; the horizontal ground vibration at 7.5m caused by the elevated rail transit is larger 3.6cm/s2 than the vertical vibration; low-frequency vibration transfers farther than high frequency vibration; the eccentric effect of two-track viaduct is obvious.
Study on Soft Soil Consolidation by Simulate Vacuum Preloading with Computer Tomography
Authors: Mao Ling Tao , Liu Tai Qian , Wen Li Ming , Yuan Ze Xun
Published: October 2012

In this paper, triaxial compression experiments on remolded soil were carried on by simulated the stress path of vacuum preloading method. With Industrial Computer Tomography(ICT), the pore micro-structure in soil samples on different load phases were studied. The number of pores was decreasing in trend, and pore area gradually became smaller. Shape factors gradually became larger, and the pore shapes were rounded. Direction angle tends to unity, orientation become better. In addition, the relationships between compression and pore surface area ratio, strength with deformation , pore size with shape factor, permeable nature and pore orientation in vacuum preloading process were established.
Study on Deformation Prediction of Landslide Based on Grey Theory and BP Neural Network
Authors: Li Rong Yu , Ruan Yong Fen , Li Shi Sheng , Wu Yong Hong
Published: October 2012

The stability of the landslide can be effectively evaluated and predicted by predicting the future development of landslide deformation according to the actual deformation of the landslide. Therefore, the accuracy of the prediction regarding the landslide deformation determines the validity of the landslide stability assessment. The GM (1.1) model in the grey system theory, uses displacement time series to establish the grey differential equation. By solving the equation, we can obtain a time response function, which can then be used to predict the landslide deformation. The BP neural network is a used for training and exercising on the deformed samples. After the error meets the requirement, we can then use the trained model to predict the landslide deformation. This paper use both grey system theory model and BP neural network model to predict Jinlong ditch application field landslide deformation.The prediction results are compared and analyzed to test the accuracy of these two predictions. Finding a more accurate prediction method for application in actual engineering project has practical significance.
3D Numerical Analysis of Soil Structure Interaction Behaviors of Pipe Jacking Construction
Authors: Liu Wen Tsung , Lu Xu Yan
Published: October 2012

This study is analyzed by numerical analysis using finite element method program of Plaxis-3D Tunnel at Kaohsiung Science Park in Taiwan. It probes the risk of tunneling procedure adopting pipe jacking construction (PJC) with man–made excavation. The main parameters of numerical calculation in this research include advancement size, soil improvement ratio and void contraction ratio, etc. Those parameters are calculated to displacement and stress distribution and we get ground movement, settlement at crown and heave at invert of tunnel excavation to assess the security. This study finds that it is safe by excavation using PJC with man-made while the gap has to be less than 38mm. Actually, the gap is 100 ~ 150mm under PJC with man-made, and it will result in high risk. Therefore, the PJC with shield has more security than other methods through monitoring ground settlement.
Meso Analysis on Soft Soil Uniaxial Consolidation Experiment with CT
Authors: Mao Ling Tao , Zhao Dan , Zhou Kai , Yuan Ze Xun , An Ji Li
Published: October 2012

In this paper, marine sediments soft soil of Beigangchi wharf in Tianjin port was scanned by Computer Tomography(CT) in different load during uniaxial consolidation experiment. The CT images were analyzed to research on the relationship between the microcosmic characteristics of Marine deposits soil and it’s compression in Tianjin areas. The results show that: with the increase of the pressure loading, the average grey value of the CT images increases gradually, which illustrates that soil samples are compacted and the density increases. The variance decreasing of CT image grey value indicates that the soil sample get more evenly. Soft soil of Beigangchi wharf in Tianjin port has high compressibility through the changes of grey compression coefficient. This paper can be referenced for the research of the structure changes of the soil sample consolidation process.
Study on the Stability Analysis Method of the Anchored Soil Slope Based on the Theory of Plasticity Limit
Authors: Wang Xiang Qiu , Yang Wen Tao , Zhang Yu Hong
Published: October 2012

Based on the analysis theory of plasticity limit, a formula of virtual work and an energy equation are established for the stability analysis of anchored soil slope, in which the soil nails and anchors are regarded as the internal structure which consumes the external power in the soil slope engineering.In the meantime, based on the simplified method of circular slip, another formula which can consider many factors such as the self-weight of slope, earthquake force, pressure of pore water and the force of anchor, is established to analyse the whole stability of anchored soil slope. It has important values for perfecting the analysis method of soil slope.
Analysis of the Interaction between the Various Influencing Factors on the Low Temperature Compressive Characteristics of Sulphate Saline Soil
Authors: Guo Xin Hong , Han Bin , Wu Guang De
Published: October 2012

According to the experiments study of sulfuric acid saline soil, the formula of compression coefficient with the changes of moisture content, salt content, initial dry density and temperature is presented, and the interaction law between the various influencing factors on sulfuric acid saline soil compression are analyzed in the paper.
The Research of Calibration of the Rainfall in Laboratory Landslide Test
Authors: Huang Ying , Shi Chong Xi , Bo Tong Zhen
Published: October 2012

The laboratory landslide test device of three part constituting by the model slotk and the catchment sink and rainfall system is developed according to test requirements, and it carried out to research calibration test of rainfall and correction of rainfall for rainfall systems under laboratory conditions. The calibration results of rainfall shown that the indoor rainfall increases linearly with time if the opening of the water-tap is reasonably controlled and that can ensure stability of the supplying water of the laboratory landslide test. The correction results of rainfall shown that, according to the energy balance method and volume method, the indoor rainfall can be converted the actual rainfall by the energy reduced coefficient in the indoor rainfall conditions and the actual rainfall conditions of the slope, and that ensure requirements of rainfall of laboratory landslide tests corresponding to the actual rainfall.The energy reduced coefficient is determined by landing speed of indoor raindrop and end speed of actual raindrop.
Strength and Deformation of Silt Foundation Effected by Groundwater Level Fluctuation
Authors: Zhang Long , Lei Xue Wen , Meng Qing Shan , Yang Xi
Published: October 2012

Based on the characteristics of frequent ground subsidence events caused by groundwater level fluctuation in coastal cities in China, the effects of groundwater level fluctuation and building load change on the strength and deformation of silt is simulated by laboratory experiments in studying on the quaternary sedimentary silt in Shanghai. It has summarized the law of the strength and deformation of silt foundation and its inherent varying mechanism through these data. The methodology and result of this research, which can be used as a reference for similar engineering and urban ground subsidence prevetion.
Study on Process Mineralogy and Concentrating of a Certain Kyanite Ore in Xingtai
Authors: Zhang Jin Xia , Chen Miao , Wei Shao Bo , Wang Xing Guo
Published: October 2012

To identify the process mineralogical properties of kyanite from Heibei so as to provide a mineralogical basis for its chemical composition, mineral constituent，ores texture and structure and so on . The results show that: the kyanite Al2O3 21.50%, SiO2 52.87%, using high intensity magnetic separation —gravity separation— flotation folwsheet. Experiments show that, the grinding fineness of -0.074mm 65%, with strong intensity magnetic separation, magnetic concentrate by shaking the low intensity magnetic separation，we can get magnetite, garnet, biotite and phlogopite four concentrates, strong magnetic ore tailings consolidated by a rocking bed mud thrown first, refined through a coarse fine two shake, shake in after a rough featured a parted, won the 60.38% grade of Kyanite concentrate and 85% grade quartz ore.
Research Advance in Fluid Flow through a Single Rock Fracture
Authors: Guo Bao Hua , Tian Cai Xia
Published: October 2012

Flow properties through a single rock fracture are the foundation of researching fluid flow in fractured rock masses. Many researchers at home and abroad are engaging in this subject for the urgent need of engineering practice. This article mainly introduces concepts of roughness, aperture, tortuosity, channeling flow, and influencing factors of stress, temperature, anisotropic, inlet head, scale effect, solution etc. Finally, some research work should be done in future are given.
Tension-Type Anchor Numerical Calculation by Energy Method
Authors: Liu Si Si , Jiang Xue Liang
Published: October 2012

According to energy principle, numerical methods of axial force and displacement of tension-type anchor are derived. Firstly, mechanism of tension-type, computation model of anchoring unit and side resistance are discussed. Secondly, anchoring unit energy balance equations are derived, and given the difference form. Thirdly, program calculation method and program convergence strategy are illustrated. At last, anchor bearing character is analyzed. The main conclusions are: anchorage body bearing character could be reasonably analyzed by using the energy method. The analysis results can provide the reference for engineering design.
Practice Research on Wet-Collapsible Loess Foundation Treatment by High Energy Dynamic Compaction
Authors: Li Qian , Tang Chuan , Fu Le , Cao Xiao Ming , Chen Pei Zhen , Wang Gao , Yang Qiang , Xiong Ying , Ma Yun , Wang Bin , Li Da Mao , Jiang Yun
Published: October 2012

A systematic and comprehensive study on the design, construction and testing of large scale of Ⅲ～Ⅳ grade wet-collapsible loess foundation treatment by 8000 kN•m high energy dynamic compaction is done in this paper. Effect on the treatment for collapsible loess foundation by dynamic compaction is analyzed through Rayleigh wave velocity test, standard penetration test, lab soil test and static cone penetration test. By comparison with physical and mechanical properties index of the foundation soil without dynamic compaction treatment, the effective reinforcement depth, the elimination of collapsibility and the bearing capacity of foundation are found to meet the design requirements. The results of this paper could supply some reference for the design, construction and testing of other collapsible loess foundations by dynamic compaction treatment.
Directional Blasting Demolition Technology of 150m-High Reinforced Concrete Chimney and 75m Cooling Tower
Authors: Xu Shun Xiang , Chen De Zhi
Published: October 2012

This paper describes the successful experience of the directional control blasting demolition of 150m-high reinforced concrete chimney and 75m cooling tower of Shizuishan Power Plant in Ningxia. It emphatically describes the pretreatment measures, blasting cut shape and size, blasting parameters, detonating network and blasting safety technology of the directional window, oriented window and load reducing slot. This paper provides the method for opening the overlarge arch oriented window, opening the special-shape load reducing slot and dense mesh safety net cross-multilayer coverage as well as comprehensive protection method for anti-flyrock splash and vibration reduction. Especially, the blast holes for opening the special-shape load reducing slot and the herringbone column are centralized at the bottom and top, which not only reduces the drilling workload, but also reduces the maximum detonating explosive amount of single section, and also reduces the safety protection workload.
Numerical Modeling of Soil-Pile Interface Behaviors of a Pipe Group Foundation under Complicated Load
Authors: Hu Shao Hua , Fang Shu , Chen Yi Feng
Published: October 2012

A three-dimensional nonlinear contact finite element method was employed in this paper to simulate the soil-pile interface behaviors of a pile group under complicated load in the Jiyang dike. The displacement at the soil-pile interfaces was particularly calculated. The computational results show that interaction mainly occurred in the bottom of the cap, and interaction development was restrained with the help of friction effect between pipes and surrounding soil. Moreover, the most unfavorable load combination is vertical uplift force together with horizontal force. As a result, potential channels of seepage flow could be formed at the location where cracks develop. Seepage field would be changed and the probability for seepage failure is increasing.
Combination GM(1,1) and Stochastic Poroelastic Theory to Prediction the Land Subsidence in Yunlin and Jiayi Area, Taiwan
Authors: Chen Kuan Wei , Lee C.H. , Wang Shih Jung , Tu Chien Hung , Chen Jung Wei
Published: October 2012

In this study, the grey system GM(1,1) and the geostatistical method are initially used to predict the land subsidence of the Yunlin area in the next five years. The Yunlin County Yuanchang Element School is taken as the site example when the stochastic poroelastic model is used in the study because there is a lack of data related to land subsidence. The verification results and prediction data of the stochastic poroelastic model and the grey system are displayed. The results show that the land subsidence in the next five years as calculated based on the data obtained from the monitoring wells is 0.3 m, while 0.31 m and 0.33 m are the prediction results from the stochastic poroelastic model and grey system model, respectively. This indicates the high precision of both models in predicting land subsidence. In order to simulate the effect of climate change on territorial planning, a prediction is made on the possible land subsidence for 2030, in this study. The prediction results are shows that by 25 January 2030, the stochastic poroelastic model shows a land subsidence of 1.01 m, while it is 1.68 m for the Grey System model. Because only the Changyuan Element School is taken as an observation station for the stochastic poroelastic model, the Grey System model is used to predict land subsidence for 2007 by the geostatistical method. The results show that land subsidence will mainly occur in the mid-western area of Yunlin and the western coastal area of Jianyi. To simulate the possible situations in the year 2030, four scene simulation models are proposed in this research, that is, adding 10% discharge, adding 20% discharge, subtracting 10% discharge, and subtracting 20% discharge. The results show the prediction on land subsidence for the year 2003 when add 10% discharge, subtract 10% discharge, add 20% discharge, and subtract 20% discharge, respectively. Land subsidence will occur mainly in the mid-western area of Yunlin and the western coastal area of Jiayi. The maximum land subsidence could reach up to 150 cm or so.
Parameter Analysis of Foundation Settlement Considering Interaction between the Pile and Soil
Authors: Song Xiao , Lu Hui Fang , Xu Guang Sheng
Published: October 2012

The assignment is using Drucker-prager elastic-plastic constitutive model for vertical load to analysis the interface behavior between soil and pile materials. Through the parameter analysis, in actual projects, the pile diameter and properties of pile endpoint soil have definite influences upon stress distribution and deformation of foundation. The conclusions obtained here could be taken for reference by similar projects.
Application of Nanomaterials in Reservoir Protection
Authors: Li Long , Li Ying Min , Yang Yu Ping , Ma Cha
Published: October 2012

Nanomaterials are of great importance to improving mudcake quality, reducing lost circulation, enhancing borehole stability, and protecting reservoir. Some nanomaterials, including nanometer plugging materials, nano-sized MMH drilling fluids, nanocomposite super-short fibers, water-based film-forming drilling fluids, nano-based drilling fluid, and so on, are introduced, and all of them have significantly influence on reservoir protection. As a result, the application of nanomaterials in the field of reservoir protection is very useful for maintaining borehole stability and protecting reservoir.
Numerical Analysis of the Ground Anchor and Row Piles in Mudstone Dip Slope
Authors: Liu Wen Tsung , Tsai Hong Yuan , Tu Ming He
Published: October 2012

It is a dip slope with mudstone and sandstone interbedded at the northward 363K National Highway NO.3. in Taiwan. The Figure 1 showed the slope sliding due to continuous heavy rain on August 19, 2010. This study analyses the slope stability by the finite element method of program PLAXIS-2D, and explores the suitability of various control engineering methods. It is named analysis before design with anchors in this study before September 2010. The aim is to search the original parameters of the ground by comparing a potential sliding surface with monitor data of site. Then countermeasure analyzes the impact based on the loss of anchor prestress and the row of piles set. From the results of analysis, sliding surface analysis and the data which was derived from the early monitor judgments are consistent. The ground anchor has been unable to achieve good stable slope effect for the slope sliding, due to heavy rains. However, the rows of pile construction significantly improved the stability of the slope.
Estimation of Rock Mass Deformation Modulus in Gas Pipeline Area Based on Different Methods
Authors: Zhao Yuan , Wang Liang Qing , Liang Ye
Published: October 2012

Deformation modulus plays an important role in evaluating slope stability of rock mass and conducting the geotechnical engineering design. Based on the research of geological properties, physical and mechanical parameters of predominant rock mass types for different formations from Zhongxian to Wuhan, China, deformation modulus values of gas pipeline area were estimated by using rock mass classification method in this paper. Comparisons were made amongst different formulas based on GSI, RMR and Q methods to suggest range values of deformation modulus for predominant rock mass types of different formations which gives instructions to estimate strength parameters of rock masses for similar projects.
Identification for Bolt-Surrounding Rock System Based on Wavelet Neural Network
Authors: Hu Jun Qiang , Zhang Yong Xing , Chen Jian Gong
Published: October 2012

The dynamic testing is widely used in undestructive testings of bolt’s anchoring quality. But it’s difficult to estimate bolt’s anchoring quality according to the dynamic response of bolt. The bolt’s anchorage quality depends mainly on bolt-surrounding rock structural system which features must be identified. A new analytical method used in identification for bolt-surrounding rock structural system is put forward, which combine with advantages of wavelet analysis and artificial neural network. The results indicate that this wavelet neural network after training can best identify the bolt’s side rigidity factors and can be a useable intelligentized mean to assess the quality of bolt’s anchoring system.
Grid Service Behavior in Geogrid-Reinforced and Pile-Supported Composite Foundations
Authors: Wang Feng , Liang Ji Feng , Bao Guo
Published: October 2012

In geogrid-reinforced and pile-supported composite foundations, the piles, grids and soil compose a complex system in which the three parties perform in coordination to bear the loads. The service behavior and functional mechanism of the geogrids are explored through static and cyclic load tests.
Energy Attenuation Model in Granular Structure
Authors: Jiang Hong Ying , Lu Jin Bu , Mu Qing Song
Published: October 2012

Based on the experimental study of the gravel layer under the level of vibration load, we analysis microscopically the dynamic response in the gravel pile and the variation of energy dissipating rapidly along the depth of granular structure. Propose that the main reasons of the energy dissipation are scattering and shear resistance. Based on the stochastic theory, we have derived the model of probability which reflects the dynamic response of the particles under the action of horizontal vibration. It has provided a theoretical basis for study on the characteristics of the energy dissipation and damping in granular structure.
Study on Homogenization Process of Masonry Using Numerical Simulation Based on Periodic Boundary Conditions
Authors: Yang Chun Xia , Shen Ji Mei , Yang Wei Jun
Published: October 2012

The homogenization technique has been used to derive equivalent material properties of masonry for many years, however, very few studies by most previous researchers concerntrated on the strain state of RVE, which is very important to calculate the equivalent material properties in the finite element modeling. In this paper, periodic boundary conditions is established automatically with the python re-development produce in ABAQUS environment, and is used to simulate the stress-strain relationship of RVE in different load cases based on ABAQUS. Equivalent elastic constants is derived and make a contrast to other researchers. The results indicated that the periodic boundary conditions derived in this article is feasible, and a reference is made for the finite element modeling of RVE.
An Analytical Study on Evaluation of Lap Splice Length of GFRP Rebar According to Reinforcement Ratio
Authors: Yun Hyo Jin , Choi Hyun Ki , Choi Chang Sik
Published: October 2012

In this study, 2D finite-element study was performed to evaluate the lap spliced length of GFRP rebar of concrete beam designed according to requirements of the current design codes. The analysis models using the general-purpose computer program ABAQUS 6.10-1(2010) are based on the test results of previous researcher. The effects of spliced length and GFRP reinforcement ratio of concrete beam were described in this paper. Total 63 analytical models were considered and nonlinear Finite Element Method (FEM) analysis was conducted. From the analytical results, lap splice length of GFRP rebar was evaluated according to flexural reinforcement ratio.
Application of Structural Loess Binary-Medium Mode in Localization Shear Band
Authors: Li Hong Ru , Feng Fei , Wang Qing
Published: October 2012

Based on the theory of breakage mechanics,the structural loess are conceptualized as binary －medium model consisting of bonding brick and frictional band. Shear band is structural loess’ breakage, localization band sprout and development is dynamic process that bonding brick is translating into frictional band.Application of double parameter breakage ratio binary-medium mode of structural loess,simulated the process of structural loess localization band sprouting and expanding with the numerical simulations method,studied localization shear band shape、speciality and law under different disfigurement project,found that the strain localization on a shear band of structural soil at originally is some sets discontinuous little local breakage area step by step developed、 connected and formed the shape of whole destruct with the external load increased,appeared dilatation softening phenomena under the especial disfigurement. Combining binary-medium mode with general finite element,solved the question of localization shear band softening,visual reappeared the course of the local shear band germination and progress.
Test Study on the CBR of Lime Improved Expansive Soil after Long-Term Immersion
Authors: Dong Yun , Wang Bao Tian
Published: October 2012

Filled road embankment along river levee or widen river levee as road embankment is often used in highway construction, part of the embankment will always immerged in water for seepage. The intensity of the filler will decrease due to the long-term immersion，which lead to eventually failure, especially in the expansive areas. This paper carried out CBR test on the lime improved expansive soil after different time’s immersion. The test results show: The CBR will linearly decreased with the previous immersion time, and then, it varies very small with the immersion time, and the stable CBR after long term immersion is about 80% of the CBR under standard condition. The paper put forward a prediction model of CBR by the immersion time, it can be used to predict the CBR of improved expansive after long term immersion, and to judge whether it meet the requirements of specification.
Fluid-Solid Coupling Analysis the Safety and Critical Distance of the Water-Filled Faults
Authors: Zhao Chun Hu
Published: October 2012

In order to anlysis the rock stress and deformation characteristics in influence of mining disturbances, water pressure and crustal stress, a multi-physics coupling model is created by Comsol4.2a in this paper.By debugging mining steps,the model simulated rock stress and deformation characteristics: under mining disturbance and water stress affect, the rock stress and displacement is basic to its original state when roadway away from the fault is greater than 205m, but the rock stress and deformation displacement increased significantly at the contact surface of fault and coal seam when coal lane away from the fault is less than 105m,and the stress gradient increased significantly between the fault and the mine roadway. the paper determine the 105m as the "critical distance".
Structural Analysis of the Shallow-Buried Station by Using Load Structure Method
Authors: Cao Yong Shuai , Zhang Yong Sheng
Published: October 2012

Aiming at a practical engineering case of a subway station, the paper uses the common software ANSYS as its analysis tool and uses the load structure method to do simulation analysis on the station's main structure. The results indicate that this method is practicable and has certain reference value for engineering design.
Elastic Analysis on Post-Local Buckling of Steel Plates in Thin-Walled Rectangular Concrete-Filled Steel Tube Columns
Authors: Guo Shao Chun , Liu Hai Feng
Published: October 2012

With the wide application of high-strength concrete and thin-wall steel tube in concrete-filled steel tube, it is essential to study the post-local buckling behavior of rectangle steel plates. Based on large deflection theory of plate, the post-local buckling behavior of steel plates in concrete-filled steel tube is analyzed in this paper. At the same time, the post-local stress of steel plates is obtained. The results indicate that the post-local buckling behavior of steel plates can be effectively utilized in large width-to-thickness ratios of steel plates.
Three Types of Stress-Strain Relationship’s Comparison of Circular Tubed Reinforced Concrete in FEA
Authors: Hu Xiao , Chen Zhen Lin
Published: October 2012

The paper introduces 3 types of uniaxial stress-strain relationships of concrete filled steel tube by Pan Youguang, Susantha and Saenz, and performs finite element analyses of the axial strengths of 18 CTRC columns, studies the characters of three models, and comprises between the axial strengths from FEA and existed experiments. Results show these 3 types of model are all suitable for bearing analysis, but Pan’s model is more accurate.
Research on the Residual Stresses in Cold-Formed Hat-Shaped Section
Authors: Liu Hua Chen , Zhao Feng
Published: October 2012

In the paper,the electrical discharge machining(EDM) technique was used to cut strips for cold-formed residual stress measurement of hat-shaped section.After adjusting the electrolyte ratio,designing specific the cutting tool and improving the methodof antiseptic treatment,the test results improved significantly. Electrical resistance strain gauges with EDM cutting technique were used to establish the magnitude and distribution of the residual stresses in cold-formed hat-shaped section.Based on the experimental findings, an idealized distribution pattern of the residual stress in cold-formed hat-shaped section is presented.
Ultimate Capacity of the K-Type Overlapped Rectangular Hollow Section Joints
Authors: Liu Jia Li , Zhao Fei Peng
Published: October 2012

The intensity calculating of simple joints is one of the most important thing in the design of space truss with hollow sections. By using the finite element method and close reference to material and geometrical nonlinear properties, numerical simulation analysis of the ultimate strength of K-type overlapped Rectangular Hollow Section joints under the axial force and bending moment was studied. The influence of the overlapped ratios and other geometrical parameters on the ultimate bearing capacity was investigated and explained graphically. With the thickness ratio of the chord bar and web member increasing, the ultimate capacity increased. And with the overlapped ratio increasing, the node capacity reduced.
A Study on Ductility of Lightweight Aggregate Concrete Shear Wall
Authors: Chen Wei Chao , Yang Wei Jun , Li Yao
Published: October 2012

Based on the properties of lightweight aggregate concrete, the yield curvature and the ultimate curvature are calculated by numerical method, and the relationship between curvature ductility ratio and displacement ductility ratios is established for lightweight aggregate concrete shear wall. It is shown that the calculating results agree well with experimental results. The major influencing factors for ductility of lightweight aggregate concrete shear wall include with or without constrain edge conponent, the characteristic value of stirrup of constrain edge conponent, the axial compression ratio and the height-width ratio and so on.
Research, Application and Promotion of New Isolation Layer
Authors: Shang Shou Ping , Zhou Hao
Published: October 2012

The paper centers on research, application and promotion of a new seismic isolation layer technology, whose study achievement includes reinforced-asphalt seismic isolation layer and reinforced-asphalt seismic level isolation pier. The experimental results show that the proposed technology shares excellent seismic isolation performance, and provides low-cost expenditure and simple construction method, which is most suitable to vast rural areas’ building in China, and it can also be implemented to the third world countries. The reinforced-asphalt isolation layer technology has been applied to engineering practice, which is the first building adapting the new technology. Meanwhile, experimental testing is carried out on it, which suggests a superior damping effect. The proposed level isolation pier technology simplifies utilization of civil buildings in rural areas.
Foundation Pit Support Design and Construction of a Complex Building in Changchun
Authors: Xiong Hui , He Long Xiang , Ma Yu Fei
Published: October 2012

With the urban construction process speeding up, the problem of slope in foundition pit engineering has become a problem urgent need to be solved. Combined with the practical engineering,this paper used the combination of soil nailing with prestressed anchors in foundation pit support design，and found this method safe, reliable, economical and well effective.