工程力学 ›› 2013, Vol. 30 ›› Issue (6): 223-230.doi: 10.6052/j.issn.1000-4750.2012.02.0122

• 土木工程学科 • 上一篇    下一篇

饱和松砂与结构接触面反复剪切下邻近土体性状数值分析

李西斌1,陈伟丽2,陈福全2,姚金梅2   

  1. 1.浙江农林大学园林学院,浙江,临安311300;
    2.福州大学土木工程学院,福建,福州350108
  • 收稿日期:2013-06-27 修回日期:2013-06-27 出版日期:2013-06-25 发布日期:2013-06-25
  • 通讯作者: 陈福全(1971―),男,福建漳平人,教授,博士,主要从事岩土与地下结构工程的教学与科研工作(E-mail:phdchen@fzu.edu.cn). E-mail:ytulxb@126.com
  • 作者简介:李西斌(1977―),男,山东冠县人,副教授,博士,主要从事软弱地基处理方面研究(E-mail:ytulxb@126.com);陈伟丽(1983―),女,山东临沂人,硕士生,主要从事岩土工程数值模拟方面研究(E-mail:443985677@qq.com);姚金梅(1986―),女,四川绵阳人,硕士生,主要从事岩土工程数值模拟方面研究(E-mail:497206067@qq.com).
  • 基金资助:

    国家自然科学基金面上项目(40972200);浙江省自然科学基金面上项目(LY12D02001)

NUMERICAL ANALYSIS OF THE BEHAVIOR OF SATURATED LOOSE SAND ADJACENT TO STRUCTURES

LI Xi-bin1,CHEN Wei-li2 ,CHEN Fu-quan2 ,YAO Jin-mei2   

  1. 1.School of Landscape Architecture,Zhejiang A & F University,Lin’an,Zhejiang 311300,China;
    2.School of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China
  • Received:2013-06-27 Revised:2013-06-27 Online:2013-06-25 Published:2013-06-25

摘要:

该文采用颗粒离散元软件PFC2D,研究了不排水条件高频循环剪切作用下饱和松砂与板桩接触面附近的砂土特性,分析了模型参数对饱和松砂孔隙率和体应变的影响,以及剪切过程中超静孔压的变化规律和砂土颗粒的运动轨迹。结果表明:当颗粒摩擦系数、颗粒刚度、剪切振幅和剪切频率越小或边界围压和接触面摩擦系数越大,饱和松砂的剪缩现象越明显。砂土的孔隙率在作用瞬间减少、然后略有增加后呈下降趋势至稳定;随循环次数增加,砂土中的超静孔压总体上呈增长趋势;砂土颗粒的变位随离开接触面距离的增加而减小。

关键词: 颗粒离散元, 高频循环剪切, 饱和松砂, 接触面, 孔隙率

Abstract:

The behaviors of the sands near the interface between saturated loose sand and a sheet pile in an undrained state under high frequency cyclic shear are simulated by using the particle flow code in 2-dimension (PFC2D).The parameters which influence the volume strain and porosity of loose saturated sand near the interface are investigated.Besides,the variation of pore water pressure and the particle motion traces near the interface are studied.Numerical simulation results show that shear-contraction appears in saturated loose sand during high frequency cyclic shear,and the shear-contraction is obvious when the values of the parameters,including the particle friction coefficient,particle stiffness,shear amplitude and shear frequency,are smaller.However,it is also obvious when the values of the parameters,including boundary confining pressure and frictional coefficient,are larger.The porosity of the sand near the interface decreases firstly,then increases a little,and then decreases until reaching a steady value.The pore water pressure near the interface increases cumulatively.Sand particles near the interface have large displacements,and the value of the displacement become larger and larger with the reduction of the distance between the interface and sand particles.

Key words: particles discrete element method, high frequency cyclic shear, saturated loose sands, interface, porosity

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