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Torsional vibration of a pipe pile in transversely isotropic saturated soil

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 509-517页

作者： zheng changjie Hua Jianmin Ding Xuanming College of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University) Ministry of Education

This study considers the torsional vibration of a pipe pile in a transversely isotropic saturated soil layer. Based on Biot＇s poroelastic theory and the constitutive relations of the transversely isotropic medium, the dynamic governing equations of the outer and inner transversely isotropic saturated soil layers are derived. The Laplace transform is used to solve the governing equations of the outer and inner soil layers. The dynamic torsional response of the pipe pile in the frequency domain is derived utilizing 1D elastic theory and the continuous conditions at the interfaces between the pipe pile and the soils. The time domain solution is obtained by Fourier inverse transform. A parametric study is conducted to demonstrate the influence of the anisotropies of the outer and inner soil on the torsional dynamic response of the pipe pile.

关键词： torsional vibration saturated soil pipe pile transversely isotropic medium

Dynamic response of a pile embedded in elastic half space subjected to harmonic vertical loading

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Acta Mechanica Solida Sinica 2017年第6期30卷 668-673页

作者： changjie zheng Shishun Gan Xuanming Ding Lubao Luan Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing Uniuersity) Ministry of Education Chongqing 400045 China School of Civil Engineering Chongqing University Chongqing 400045 China

An analytical method is developed to investigate the dynamic response of a pile subjected to harmonic vertical *** pile is modeled as a one-dimensional（1D）elastic *** elastic soil is divided into a homogeneous half space underlying the base of pile and a series of infinitesimally thin layers along the vertical shaft of *** analytical solution for the soil-pile dynamic interaction problem is obtained by the method of Hankel *** proposed solution is compared with the classical plane strain *** examples are presented to demonstrate the sensitivity of the vertical impedance of the pile to relevant parameters.

关键词： Pile Dynamic response Vertical loading

Model tests on XCC-piled embankment under dynamic train load of high-speed railways

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 581-594页

作者： Niu Tingting Liu Hanlong Ding Xuanming zheng changjie College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China Anhui University of Science&Technology Huainan 232001China Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University) School of Civil EngineeringChongqing UniversityChongqing 400045China

Piled embankments,which offer many advantages,are increasingly popular in construction of high-speed railways in *** the performance of piled embankment under static loading is well-known,the behavior under the dynamic train load of a high-speed railway is not yet *** light of this,a heavily instrumented piled embankment model was set up,and a model test was carried out,in which a servo-hydraulic actuator outputting M-shaped waves was adopted to simulate the process of a running *** pressure,settlement,strain in the geogrid and pile and excess pore water pressure were *** results show that the soil arching height under the dynamic train load of a high-speed railway is shorter than under static *** growth trend for accumulated settlement slowed down after long-term vibration although there was still a tendency for it to *** geogrid strain has an increasing tendency after long-term *** closer the embankment edge,the greater the geogrid strain over the *** in the pile were smaller under dynamic train loads,and their distribution was different from that under static *** the same elevation,excess pore water pressure under the track slab was greater than that under the embankment shoulder.

关键词： piled embankment model test dynamic train load of high-speed railways XCC-pile M-shaped wave

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus

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Acta Mechanica Sinica 2016年第1期32卷 112-124页

作者： Yifei Sun Yang Xiao changjie zheng Khairul Fikry Hanif Faculty of Engineering and Information Sciences University of Wollongong College of Civil Engineering Chongqing University ARC Centre of Excellence for Geotechnical Science and Engineering University of Newcastle Faculty of Engineering Computing and MathematicsUniversity of Western Australia

Many constitutive models exist to characterise the cyclic behaviour of granular soils but can only simulate deformations for very limited cycles. Fractional derivatives have been regarded as one potential instrument for modelling memory-dependent phenomena. In this paper, the physical connection between the fractional derivative order and the fractal dimension of granular soils is investigated in detail. Then a modified elasto-plastic constitutive model is proposed for evaluating the long-term deformation of granular soils under cyclic loading by incorporating the concept of fac- tional calculus. To describe the flow direction of granular soils under cyclic loading, a cyclic flow potential consider- ing particle breakage is used. Test results of several types of granular soils are used to validate the model performance.

关键词： Constitutive model Fractional order Fractional calculus Long-term deformation

An Analytical Solution for Wave Propagation in a Pipe Pile with Multiple Defects

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Acta Mechanica Solida Sinica 2020年第2期33卷 251-267页

作者： Xuanming Ding Lubao Luan changjie zheng Guoxiong Mei Hang Zhou Key Laboratory of New Technology for Construction of Cities in Mountain Area College of Civil EngineeringChongqing UniversityChongqing 400045China School of Civil Engineering Fujian University of TechnologyFuzhou 350118China Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education College of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China

An analytical solution is developed in this paper to conduct the low-strain integrity testing for a pipe pile with multiple *** derived solution allows simulating the pipe pile as a three-dimensional model by considering the wave propagation in the vertical,circumferential and radial *** solutions of the pile are obtained by the Laplace transform and separation of ***,time-domain responses of the solution are deduced by the inverse Fourier transform *** solution is validated against the published solutions for an intact pile and a pile with a single *** studies are conducted to identify and characterize the velocity responses on the top of pipe piles with multiple *** results suggest that the reflected waves generated by the deep defects are affected by the secondary reflections from the shallow defects.A new detecting method is proposed to decrease the influence of high-frequency interferences and to predict the defective depth,which suggests putting the receiver at the point of 90°along the circumferential direction.

关键词： Wave propagation Pipe pile Multiple defects Low-strain dynamic testing

Horizontal dynamic response of a large-diameter pipe pile considering the second-order effect of axial force

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 567-579页

作者： Luan Lubao Ding Xuanming Zhou Wei zheng changjie Qu Liming Key Laboratory of New Technology for Construction of Cities in Mountain Area College of Civil EngineeringChongqing UniversityChongqing 400045China Powerchina Chengdu Engineering Corporation Limited Chengdu 611130China

The second-order effect of axial force on horizontal vibrating characteristics of a large-diameter pipe pile is theoretically *** equations of the pile-soil system are established based on *** wave equations of soil are decoupled through differential transformation and variable ***,expressions of soil displacements and horizontal resistances can be *** analytical solution of the pile is derived based on continuity conditions between the pile and soil,subsequently from which expressions of the complex impedances are *** are carried out to examine the second-order effect of axial force on the horizontal vibrating behavior of the pipe *** conclusions can be summarized as follows： stiffness and damping factors are decreased with the application of axial force on the pile head; distributions of the pile horizontal displacement and rotation angle are regenerated due to the second-order effect of the applied axial force; and redistributions of the bending moment and shearing force occur due to the second-order effect of the applied axial force.

关键词： axial force second-order effect horizontal vibration pipe pile analytical solution

Numerical and test study on vertical vibration characteristics of pile group in slope soil topography

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 377-390页

作者： Qu Liming Ding Xuanming zheng changjie Wu Chongrong Cao Guangwei College of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China School of Civil Engineering Fujian University of TechnologyFuzhou 350118China Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering Fuzhou 350118China

Topography effects on the vertical vibration responses of pile group are revealed though numerical analysis and model ***,a series of model tests with different topography of ground and bedrock are *** results indicate that displacement amplitude of the pile head in sloping ground topography is larger than in horizontal *** displacement at various positions of the pile cap is observed in non-horizontal ***,a numerical algorithm is employed to further explore the essential response characteristics in group piles of different topography configurations,which has been verified by the test *** lengths of the exposed and frictional segment,together with the thickness of the subsoil layer,are the dominant factors which cause non-axisymmetric vibration at the pile cap.

关键词： topography effects pile group vibration response model test numerical method

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低应变瞬态荷载作用下基桩动力响应解析解

土木工程学报 2019年第11期52卷 79-85页

作者：郑长杰丁选明栾鲁宝瞿立明福建工程学院福建福州350118 福建省土木工程新技术与信息化重点实验室福建福州350118 重庆大学重庆400045

目前广泛采用的基桩低应变检测问题的理论基础是基于平截面假定的一维应力波理论。而实际上,锤击产生的应力波是三维应力波,不仅沿桩身纵向传播,还沿径向传播,对于基桩低应变检测问题平截面假定实际上是不成立的。此时,一维纵波传播问... 详细信息

目前广泛采用的基桩低应变检测问题的理论基础是基于平截面假定的一维应力波理论。而实际上,锤击产生的应力波是三维应力波,不仅沿桩身纵向传播,还沿径向传播,对于基桩低应变检测问题平截面假定实际上是不成立的。此时,一维纵波传播问题转换为应力波沿三维柱体传播问题。文章从基桩三维理论出发,忽略桩土径向位移,考虑桩体中应力波沿纵向和径向传播与桩土的相互作用,建立三维条件下桩土系统瞬态振动计算模型,推导得到低应变瞬态荷载作用下基桩三维动力响应的解析解,以期为基桩低应变检测提供新的理论指导。

关键词：低应变检测基桩三维效应解析解高频干扰

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考虑剪切变形的PCC桩水平振动响应解析解

岩石力学与工程学报 2016年第11期35卷 2345-2358页

作者：栾鲁宝丁选明刘汉龙郑长杰重庆大学山地城镇建设与新技术教育部重点实验室重庆400045 河海大学土木与交通学院江苏南京210098

为了探讨考虑剪切变形的PCC桩水平振动特性,首先,采用Timoshenko模型模拟PCC桩,建立其水平振动控制方程;其次,采用微分变换和分离变量法对三维土体控制方程进行解耦,推导出土体位移和水平阻抗解析表达式;然后,结合桩土连续性条件,推导出... 详细信息

为了探讨考虑剪切变形的PCC桩水平振动特性,首先,采用Timoshenko模型模拟PCC桩,建立其水平振动控制方程;其次,采用微分变换和分离变量法对三维土体控制方程进行解耦,推导出土体位移和水平阻抗解析表达式;然后,结合桩土连续性条件,推导出PCC桩动力复阻抗解析表达式。由此进行算例分析表明:Timoshenko模型与Euler-Bernoulli模型推导的桩顶水平动力复阻抗变化规律一致,验证了解的合理性;复阻抗实部均随桩长增加而减小,虚部均随桩长增加而增大,当桩长增加到临界桩长时,桩长对复阻抗实部和虚部基本没有影响;复阻抗随内径减小而增大,当内径减小至0.2 m及以下时,桩芯土对复阻抗影响不大;当横截面面积相同时,平均半径和壁厚对复阻抗均有显著影响。

关键词：桩基工程 Timoshenko模型大直径管桩桩水平振动解析解复阻抗