圆锥贯入过程的离散元仿真  

Discrete Element Simulation of Cone Penetration Process

作　　者：孙鹏[1] 高峰[1] 李雯[1] 姚圣卓[1] 弓永涛[1] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《农业机械学报》2009年第1期184-188,226,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家"863"高技术研究发展计划资助项目(2007AA11Z244);高等学校博士学科点专项科研基金资助项目(20070006012)

摘　　要：以室内矾土颗粒、玻璃球和Toyoura砂的贯入试验结果为参考,利用离散单元法对圆锥贯入过程进行了数值仿真。数值仿真与室内试验结果对比表明:数值仿真得到的颗粒集合的贯入曲线与室内试验的结果较吻合,说明离散元法能够很好地模拟圆锥贯入过程中颗粒之间、颗粒与圆锥间的相互作用,并得到合理的宏观特性。仿真和室内试验都指出,随着孔隙率的增大,贯入阻力的数值随之减小。最后,就细观参数、贯入速度、试样颗粒数量及颗粒形状等因素变化对数值仿真结果的影响进行了分析。Based on the results of cone penetration laboratory tests on alumina balls, glass balls and Toyoura sand, the discrete element method （DEM） was used to simulate cone penetration process. Compared the numerical simulation with experimental results, the curves of simulation have the same tendency as those of penetration experiment, which indicates that DEM can effectively simulate the force between particles, the force between a particle and the cone when the cone is penetrating, and get the reasonable macroscopic characteristics. Both the simulation and the penetration experiment indicate that the penetration resistance decreased with the increase of the porosity. Finally, the influences on the numerical simulation, caused by the variation of mesoscopic parameters, penetration speed, quantities of the particles and particle shape, were analyzed.

关 键 词：圆锥贯入 离散单元法 数值模拟 细观参数 

分 类 号：TU411[建筑科学—岩土工程] O242.1[建筑科学—土工工程]