圆锥指数仪贯入沙土试验的离散元法模拟  

Discrete Element Simulations of the Cone Penetration Tests in Sandy Soil

作　　者：李艳洁[1] 林剑辉[1] 徐泳[2] 

机构地区：[1]北京林业大学工学院,北京100083 [2]中国农业大学理学院,北京100083

出　　处：《农业机械学报》2011年第11期44-48,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(30800665);中央高校基本科研业务费专项资金资助项目(YX2010-6)

摘　　要：利用离散元法对圆锥指数仪贯入沙土的试验进行了数值模拟研究。贯入试验与数值模拟结果所揭示的现象相吻合,即圆锥侧壁上的土壤摩擦阻力对总贯入阻力影响微小。离散元数值模拟结果显示,贯入圆锥锥尖部位的颗粒力链为强力链,颗粒的速度数值较大但方向杂乱,其他位置颗粒几乎静止;圆锥指数仪的贯入阻力随贯入深度增加而显著增大;土槽侧壁的正压力随贯入深度增加而增大;贯入速度变化对贯入阻力和土槽侧壁正压力的影响微弱。The simulative study with discrete element method for the cone penetration into the sandy soil was investigated.The results of the simulations and the tests are in good agreement,and the friction on the cone side surface has little influence on the penetration resistance.The conclusion of DEM shows that the strong force chain is located at the cone tip,where the directions of particle velocities are in disorder,while the particles in other place are almost stabile.The penetration resistance increased as the increase of penetration depth,and the normal pressure on the side wall of the soil bin.However,the penetration velocity has little influence on the penetration resistance.

关 键 词：圆锥指数仪 贯入 沙土 离散元法 

分 类 号：O347.7[理学—固体力学] TU411[理学—力学]