喀斯特地区地层塌陷的离散元法数值模拟

Numerical simulation of DEM on Collapse of soil layer in Karst region

运用LS-DYNA非线性动力学分析软件,采用离散单元法对喀斯特地区地层塌陷现象进行数值模拟,并进一步分析了不同塌孔直径对塌陷效果的影响.结果表明:在实际案例所涵盖的粒径及塌孔尺寸范围内,数值模拟给出了地层塌陷漏斗母线和塌陷效果具有较好的一致性;岩层开洞尺寸的大小对土粒塌陷速度和塌陷形态有一定的影响.

Based on the discrete element method（ DEM）,the process of soil layer collapsing in Karst region was simulated by LS-DYNA. Furthermore,the effect of different holediameter on collapse was analyzed. The results show that in the range of soil diameter and collapse size included by actual cases,the numerical simulation shows that the collapse funnel bus of the soil layer and the final collapse effect are in good agreement,and the size of the hole had some influence on the collapse velocity and the shape of the collapse.