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Journal of Central South University 2014年第9期21卷 3648-3655页

作者：孔纲强周航刘汉龙丁选明 LIANG Robert College of Civil and Transportation Engineering Hohai University Department of Civil Engineering The University of Akron

A simplified approach was proposed to analyze the negative skin friction calculation of special-shaped pile considering pile-soil interaction under surcharge. Based on the concentric cylinder shearing theory, considering the changes of pile shape(such as, taper angle and diameters of pile base, etc.), the load-transfer of special-shaped pile was built. The accuracy of the developed simplified approach was verified by numerical simulation model with the same condition. Then, the influence factors, such as, taper angles, the diameter of pile base, surcharge, and pile-soil interface parameters were analyzed and discussed. The results show that the developed simplified approach can calculate NSF of special-shaped pile under surcharge effectively. A limited parametric study indicates that in many practical situations special-shaped piles(such as belled wedge pile shown in this work) offer a design option that is more economical than traditional uniform cross-section piles.

关键词： negative skin friction special-shaped pile pile-soil interaction dragload downdrag surcharge

3D finite element analysis on pile-soil interaction of passive pile group

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Journal of Central South University of Technology 2008年第1期15卷 75-80页

作者：赵明华刘敦平张玲蒋冲 Institute of Geotechnical Engineering Hunan University

The interaction between pile and soft soil of the passive pile group subjected to soil movement was analyzed with three-dimensional finite element model by using ANSYS software. The soil was assumed to be elastic-plastic complying with the Drucker-Prager yield criterion in the analysis. The large displacement of soil was considered and contact elements were used to evaluate the interaction between pile and soil. The influences of soil depth of layer and number of piles on the lateral pressure of the pile were investigated, and the lateral pressure distributions on the (2×1) pile group and on the (2×2) pile group were compared. The results show that the adjacent surcharge may result in significant lateral movement of the soft soil and considerable pressure on the pile. The pressure acting on the row near the surcharge is higher than that on the other row, due to the "barrier" and arching effects in pile groups. The passive load and its distribution should be taken into account in the design of the passive piles.

关键词： pile-soil interaction passive pile group soft soil lateral pressure deformation 3D finite element analysis

Simplified analytical solution for stress concentration ratio of piled embankments incorporating pile–soil interaction

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Railway Engineering Science 2021年第2期29卷 199-210页

作者： Qiang Luo Ming Wei Qingyuan Lu Tengfei Wang School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China MOE Key Laboratory of High-Speed Railway Engineering Southwest Jiaotong UniversityChengdu 610031China

piled embankments have been extensively used for high-speed rail over soft soils because of their effectiveness in minimizing differential settlement and shortening the construction *** concentration ratio,defined as the ratio of vertical stress carried by pile heads(or pile caps if applicable)to that by adjacent soils,is a fundamental parameter in the design of piled *** view of the complicated load transfer mechanism in the framework of embankment system,this paper presents a simplified analytical solution for the stress concentration ratio of rigid pile-supported *** the derivation,the effects of cushion stiffness,pile–soil interaction,and pile penetration behavior are considered and examined.A modified linearly elastic-perfectly plastic model was used to analyze the mechanical response of a rigid pile–soil *** analytical model was verified against field data and the results of numerical simulations from the *** to the proposed method,the skin friction distribution,pile–soil relative displacement,location of neural point,and differential settlement between the pile head(or cap)and adjacent soils can be *** work serves as a fast algorithm for initial and reasonable approximation of stress concentration ratio on the design aspects of piled embankments.

关键词： piled embankments pile-soil interaction pile penetration Cushion Rigid pile High-speed railway

The Boundary Element Method for pile-soil interaction

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China Ocean Engineering 1992年第3期7卷 317-330页

作者： Liu Xingye Associate Professor, Department of Civil Engineering, Tianjin University, 300072 Tianjin

In this paper, several mathmatical models for the pile- soil interaction are outlined. The Boundary Element Method is one of the very effective methods for the reasonable models of elasticity and elastoplasticity. The major of this paper is concerned with the Boundary Element Method for the pile-soil interaction, including general methods and calculating formulation of static and dynamic analysis of the pile and pile groups. Some results of analysis are also given.

关键词： pile soil pile-soil interaction boundary element method BE-FE coupled method

Comparative Analysis of Seismic Response Characteristics of pile-soil-Stnicture interaction System

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Journal of Ocean University of China 2006年第1期5卷 1-6页

作者： KONG Desen LUAN Maotian WANG Weiming School of Civil Engineering Harbin Institute of Technology Harbin 150090 P.R. China School of Civil and Architectural Engineering Shandong University of Science and Technology Qingdao 266510 P.R. China Institute of Geotechnical Engineering Dalian University of Technology Dalian 116024 P.R. China

The study on the earthquake-resistant performance of a pile-soil-structure interaction system is a relatively complicated and primarily important issue in civil engineering practice. In this paper, a computational model and computation procedures for pile-supported structures, which can duly consider the pile-soil interaction effect, arc established by the finite clement method. Numerical implementation is made in the time domain. A simplified approximation for the seismic response analysis of pile-soil-structure systems is briefly presented. Then a comparative study is performed for an engineering example with numerical results computed respectively by the finite clement method and the simplified method. Through comparative analysis, it is shown that the results obtained by the simplified method well agree with those achieved by the finite element method. The numerical results and findings will offer instructive guidelines for earthquake-resistant analysis and design of pile-supported structures.

关键词： pile-supported structures pile-soil interaction seismic response analysis finite elements method

pile-clayey soil interaction analysis by boundary element method

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Journal of Rock Mechanics and Geotechnical Engineering 2012年第1期4卷 28-43页

作者： Mohammed Y.Fattah Kais T.Shlash Madhat S.M.Al-Soud Department of Building and Construction Engineering University of TechnologyBaghdadIraq Department of Civil Engineering University of MustansiryahBaghdadIraq

This paper is an attempt to solve the soil-pile interaction problems using the boundary element method（BEM）.A computer package called PGroupN,which deals mainly with the analysis of the pile group problem,is employed in this *** studies are carried out to assess the impacts of the pile diameter,pile length,ratio of spacing to diameter and the thickness of soil *** external load is applied incrementally and,at each increment,a check is made that the stress state at the pile-soil interfaces does not violate the yield *** is achieved by specifying the limited stresses of the soil for the axial pile shaft capacity and end-bearing *** elements of the pile-soil interface yielded can take no additional load,and any increase in load is therefore redistributed between the remaining elements until all elements have ***,by successive application of loading increments,the entire load-displacement relationship for the pile group is *** is found that as the applied load reaches the ultimate bearing capacity of the pile group,all the piles will share the same amount of *** exception to this case is for the center pile in a group of 9 piles embedded in clay,which is not consistent with the behaviors of the other piles in the group even if the load reaches the ultimate *** the 4 piles group embedded in clay,the maximum load carried by the base does not exceed 8% of the load carried by each pile with different *** low percentage ascertains that the piles embedded in cohesive soils carry most of the load throughout their shafts.

关键词： pile foundations clayey soil pile-soil interaction boundary element method (BEM)

The mechanical response of piles with consideration of pile-soil interactions under a periodic wave pressure

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Journal of Hydrodynamics 2014年第6期26卷 921-929页

作者：王环玲徐卫亚朱峰 Key Laboratory of Coastal Disaster and Defence Ministry of Education Hohai University Department of Civil Engineering University of Toronto Institute of Geotechnical Engineering Hohai University

The pile-soil interaction under wave loads is an extremely complex and difficult issue in engineering. In this study, a physical model test is designed based on the principle of the gravity similarity to obtain time histories of wave forces of unsteady regular waves, and to measure the magnitude and the distribution of wave forces acting on the piles. A numerical model and relevant numerical methods for the pile-soil contact surface are adopted based on the principles of elastic dynamics. For a practical project, the time histories of wave forces on the piles are obtained through physical model tests. The deformations of the piles in the pile-soil interactions and the distribution of the bending moment on the piles are studied. It is shown that, with the increase of the period of wave pressures, the absolute value of the horizontal displacement of the piles increases, the embedment depth of the piles increases, and the scope of influence of soils increases. The change of the bending moment on the piles is consistent with that of its theoretical results, and the proposed numerical method can very well simulate the properties of the piles.

关键词： periodic wave pressure pile-soil interaction non-linear contact numerical calculation

Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-soil system

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Frontiers of Structural and Civil Engineering 2020年第4期14卷 961-982页

作者： Qian-Qing ZHANG Shan-Wei LIU Ruo-Feng FENG Jian-Gu QIAN Chun-Yu CUI Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China Key Laboratory of Geotechrical and Underground Engineering of the Minstry of Education Tongji UniversityShanghai 200092China

A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation,and basin-shaped settlement is often observed in *** differential settlement of pile groups will decrease the use-safety requirements of building,even cause the whole-building tilt or *** reduce differential settlement among individual piles,non-uniformly arranged pile groups can be *** paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile *** the userdefined subroutine FRIC as the secondary development platform,a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS *** to the response analysis of a single pile,the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer *** reinforcing effects of individual piles is then analyzed using the present finite element ***,the response of non-uniformly arranged pile groups,e.g.,individual piles with variable length and individual piles with variable diameter,is analyzed using the proposed numerical analysis *** suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes.

关键词： numerical simulation non-uniformly arranged pile groups differential settlement pile-soil interaction

Dynamic p-y curves for vertical and batter pile groups in liquefied sand

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Earthquake Engineering and Engineering Vibration 2022年第3期21卷 605-616页

作者： Zhang Jian Li Yurun Rong Xian Liang Yan School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Campus Construction and Management Hebei University of TechnologyTianjin 300401China

In this study,centrifuge model tests of vertical and batter pile groups in liquefied sand were conducted on a centrifuge shaking *** dynamic p-y curves for these pile groups before and during sand liquefaction were obtained from calculations based on test *** results confirm that liquefaction contributes to a reduction in the energy consumption of pile foundations,with the degradation effect being more pronounced for batter pile *** shallow depths,the difference in the backbone gradients of the p-y curves after liquefaction for vertical and batter pile groups indicates that the lateral stiffness of a batter pile group is greater than that of a vertical pile *** shaking intensity increases,the lateral stiffness of a vertical pile group increases with depth during the late stage of sand ***,the lateral stiffness of a batter pile group during liquefaction does not vary with *** results of this study provide a reference for the seismic design of vertical and batter pile groups in liquefied soil.

关键词： soil liquefaction pile-soil interaction p-y curve centrifuge shaking table

A simplified method for the determination of vertically loaded pile-soil interface parameters in layered soil based on FLAC3D

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Frontiers of Structural and Civil Engineering 2016年第1期10卷 103-111页

作者： Jiu-jiang WU Yan LI Qian-gong CHENG Hua WEN Xin LIAN School of Civil Engineering and Architecture Southwest University of Science and Technology Mianyang 621010 China Department of Geological Engineering Southwest Jiaotong University Chengdu 610031 China Faculty of Civil Engineering Guangxi University of Science and Technology Liuzhou 545006 China

The numerical analysis of pile-soil interaction commonly requires a lot of trial works to determine the interface parameters and the accuracy cannot be ensured normally. Considering this, this paper first conducts a sensitivity analysis to figure out the influence of interface parameters on the bearing behavior of a single pile in sand. Then, a simplified method for the determination of pile-soil interface parameters in layered soil is proposed based on the parameter studies. Finally, a filed loading test is used for the validation of the simplified method, and the calculated results agree well with the monitoring data. In general, the simplified method proposed in this paper works with higher accuracy and consumes less time compared with the traditional trial works, especially on the determinations ofinterfacial cohesive and interracial friction angle.

关键词： determination of interface parameters pile-soil interaction FLAC3D sensitivity analysis layered soil