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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

Longitudinal vibration of pile in layered soil based on Rayleigh-Love rod theory and fictitious soil-pile model

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Journal of Central South University 2015年第5期22卷 1909-1918页

作者：吕述晖王奎华吴文兵 C.J.LEO Key Laboratory of Soft soils and Geoenvironmental Engineering of Ministry of Education(Zhejiang University) Engineering Faculty China University of Geosciences School of Computing Engineering and Mathematics University of Western SydneyLocked Bag 1797 Penrith Sydney NSW 2751 Australia

The dynamic response of pile in layered soil is theoretically investigated when considering the transverse inertia ***, the fictitious soil-pile model is employed to simulate the dynamic interaction between the pile and the soil layers beneath pile toe. The dynamic interactions of adjacent soil layers along the vertical direction are simplified as distributed Voigt ***, the pile and fictitious soil-pile are assumed to be viscoelastic Rayleigh-Love rods, and both the radial and vertical displacement continuity conditions at the soil-pile interface are taken into consideration. On this basis, the analytical solution for dynamic response at the pile head is derived in the frequency domain and the corresponding quasi-analytical solution in the time domain is then obtained by means of the convolution theorem. Following this, the accuracy and parameter value of the hypothetical boundaries for soil-layer interfaces are discussed. Comparisons with published solution and measured data are carried out to verify the rationality of the present solution. Parametric analyses are further conducted by using the present solution to investigate the relationships between the transverse inertia effects and soil-pile parameters.

关键词： viscoelastic pile layered soil longitudinal vibration fictitious soil-pile transverse inertia effect

Stochastic seismic response of multi-layered soil with random layer heights

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Earthquake Engineering and Engineering Vibration 2010年第2期9卷 213-221页

作者： M.Badaoui M.K.Berrah A.Mébarki Université Paris-Est Laboratoire Modélisation et Simulation Multi Echelle Ecole Nationale Polytechnique

This paper deals with the effect of layer height randomness on the seismic response of a layered soil. These parameters are assumed to be lognormal random variables. The analysis is carried out via Monte Carlo simulations coupled with the stiffness matrix method. A parametric study is conducted to derive the stochastic behavior of the peak ground acceleration and its response spectrum,the transfer function and the amplification factors. The input soil characteristics correspond to a site in Mexico City and the input seismic accelerations correspond to the Loma Prieta earthquake. It is found that the layer height heterogeneity causes a widening of the frequency content and a slight increase in the fundamental frequency of the soil profile,indicating that the resonance phenomenon is a concern for a large number of structures. Variation of the layer height randomness acts as a variation of the incident angle,i.e.,a decrease of the amplitude and a shift of the resonant frequencies.

关键词： random layer heights layered soil seismic acceleration lognormal distribution amplification factors Mexico City

A theoretical analysis of vertical dynamic response of large-diameter pipe piles in layered soil

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Journal of Central South University 2014年第8期21卷 3327-3337页

作者：丁选明郑长杰刘汉龙 Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University College of Civil Engineering Chongqing University

Considering the viscous damping of the soil and soil-pile vertical coupled vibration,a computational model of large-diameter pipe pile in layered soil was *** analytical solution in frequency domain was derived by Laplace transformation *** responses in time domain were obtained by inverse Fourier *** results of the analytical solution proposed agree well with the solutions in homogenous *** effects of the shear modulus and damping coefficients of the soil at both outer and inner sides of the pipe pile were *** results indicate that the shear modulus of the outer soil has more influence on velocity admittance than the inner *** smaller the shear modulus,the larger the amplitude of velocity *** velocity admittance weakened by the damping of the outer soil is more obvious than that weakened by the damping of the inner *** displacements of the piles with the same damping coefficients of the outer soil have less ***,the effects of the distribution of soil layers are *** results indicate that the effect of the upper soil layer on dynamic response of the pipe pile is more obvious than that of the bottom soil layer.A larger damping coefficient of the upper layer results in a smaller velocity *** dynamic response of the pipe pile in layered soil is close to that of the pipe pile in homogenous soil when the properties of the upper soil layer are the same.

关键词： dynamic response large-diameter pipe pile layered soil velocity admittance dynamic stiffness

Longitudinal dynamic response of pile in layered soil based on virtual soil pile model

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Journal of Central South University 2012年第7期19卷 1999-2007页

作者：吴文兵王奎华马少俊 CHIN Jian Leo Key Laboratory of Soft soils and Geoenvironmental Engineering of Ministry of Education(Zhejiang University) Engineering Faulty China University of Geosciences School of Engineering University of Western Sydney

Taking the effect of finite soil layers below pile end into account,the longitudinal dynamic response of pile undergoing dynamic loading in layered soil was theoretically ***,finite soil layers below pile end are modeled as virtual soil pile whose cross-section area is the same as that of the pile and the soil layers surrounding the pile are described by the plane strain ***,by virtue of Laplace transform and impedance function transfer method,the analytical solution of longitudinal dynamic response at the pile head in frequency domain is ***,the semi-analytical solution in time domain undergoing half-cycle sine pulse at the pile head is obtained by means of inverse Laplace *** on these solutions,a parametric study is conducted to analyze emphatically the effects of parameters of soil below pile end on velocity admittance and reflected wave signals at the pile ***,a comparison with other models with different supporting conditions from soil below pile end is performed to verify the model presented.

关键词： soil-pile dynamic interaction virtual soil pile layered soil longitudinal vibration velocity admittance reflected wavesignal

Theoretical Formula for Calculating Negative Skin Friction of Pile in layered soil and Its Application

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Journal of Southwest Jiaotong University(English Edition) 2010年第1期18卷 19-26页

作者：肖俊华赵锡宏 School of Civil Engineering Shandong Jianzhu University Department of Geotechnical Engineering Tongji University

Based on Zeevaert＇s method, a theoretical formula was developed to calculate the negative skin friction of pile in layered soil. For practical purpose,a cut-and-try method was proposed to determine neutral point. Case studies indicate that the total calculated negative skin friction was in agreement with the measured one, which verifies the feasibility and practicability of theoretical formula. Furthermore, the methods for calculating efficiency factor of drag load and settlement were also given.

关键词： Negative skin friction Neutral point Pile layered soil

Axisymmetric Finite Element Method for Analysis of Plate on layered soil

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Computer Aided Drafting,Design and Manufacturing 2008年第1期18卷 12-18页

作者： YIN Yi-ping1, FAN Qin-han1,2 (1. School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China 2. China Zhongtie Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan 430050,China)

To obtain the fundamental solution of soil has become the key problem for the semi-analytical and semi-numerical (SASN) method in analyzing plate on layered soil. By applying axisymmetric finite element method (FEM),an expression relating the surface settlement and the reaction of the layered soil can be obtained. Such a reaction can be treated as load acting on the applied external load. Having the plate modelled by four-node elements,the governing equation of the plate can be formed and solved. In this case, the fundamental solution can be introduced into the global soil stiffness matrix and five-node or nine-node element soil stiffness *** existing commercial FEM software can be used to solve the fundamental solution of soil, which can bypass the complicated formula derivation and boasts high computational efficiency as well.

关键词： semi-analytical and semi-numerical method fundamental solution layered soil axisymmetric finite element method

New pseudo-dynamic analysis of two-layered cohesive-friction soil slope and its numerical validation

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Frontiers of Structural and Civil Engineering 2020年第6期14卷 1492-1508页

作者： Suman HAZARI Sima GHOSH Richi Prasad SHARMA Department of Civil Engineering National Institute of TechnologyAgarala 799046India

Natural slopes consist of non-homlogeneous soil profiles with distinct characteristics from slopes made of homogeneous *** this study,the limit equilibrium modified pseudo-dynamic method is used to analyze the stability of two-layered c-φsoil slopes in which the failure surface is assumed to be a logarithmic *** zero-stress boundary condition at the ground surface under the seismic loading condition is *** formulations derived from an analytical method are proposed for the predicting the seismic response in two-layered soil.A detailed parametric study was performed in which various parameters(seismic accelerations,damping,cohesion,and angle of internal friction)were *** results of the present method were compared with those in the available *** present analytical analysis was also verified against the finite element analysis results.

关键词： layered soil limit equilibrium method seismic analysis damping PLAXIS

Pile Running in layered soils

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China Ocean Engineering 2023年第5期37卷 829-841页

作者： ZHAO Huan WANG Le SUN Li-qiang TIAN Ying-hui Oliver REUL CHEN Quan-zhen State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China Department of Infrastructure Engineering The University of MelbourneParkvilleVictoria 3010Australia Department of Geotechnical Engineering University of KasselKassel 34109Germany

This paper presents a case study on incidents of offshore pile running in layered *** study provides a detailed description of the seabed soil data,pile driving records,and field surveillance video ***-dimensional large deformation finite element(LDFE)analyses were conducted to retrospectively analyze the incidents,considering the remoulding of seabed soil and degradation of the pile-soil interface in the LDFE *** comparing the field observations with the LDFE analysis,the mechanism of pile running was discussed,with a focus on investigating the pile penetration resistance in each *** study revealed that pile running in layered soils primarily resulted from a significant reduction in pile base resistance when transitioning from a strong layer to an adjacent weak *** further investigate the pile running mechanism in layered soils,a parametric study on the strength variation of adjacent soil layers and its influence on pile base resistance was ***,a simplified prediction model of pile base resistance,suitable for assessing the risk of pile running in layered soils,was proposed.

关键词： pile running coupled Eulerian−Lagrangian method layered soil penetration resistance pile−soil interaction