平端压头静力侵入岩石的数值研究  

Numerical Anslysis of Flat-ended Indenter Statically Invading into Rock

作　　者：杨小林[1,2] 唐国强 谢冰[2] 

机构地区：[1]中铁隧道集团有限公司盾构及掘进技术国家重点实验室,河南郑州450003 [2]洛阳理工学院建筑工程系,河南洛阳471023 [3]河南理工大学土木工程学院,河南焦作454003

出　　处：《河南科技大学学报（自然科学版）》2012年第6期45-50,7,共6页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家重点基础研究发展规划(973计划)基金项目(2010CB736008)

摘　　要：在对实际试验条件做合理简化的基础上,进行了平端压头侵入红砂岩的模拟研究。首先根据FLAC3D接触面理论建立接触面单元。然后,将基于应变等效的损伤模型引入仿真,对模拟过程进行了分析。最后,通过对比仿真和试验结果,分析压头尺寸和加载速率对压头侵入的影响。平端压头静力侵入岩石的结果与试验观测吻合。由仿真结果可知:岩石是由压头下端密实核外围剪切膨胀引起裂纹扩展破坏的,压头半径越大越难于侵入,并且压头半径与载荷存在近似线性相关,加载速率对侵入功有影响。On the basis of the reasonable simplification of the experimental conditions,the simulation of the flat-ended indenter statically invading into the red sandstone was mainly performed.First,according to the theory of contact surface of FLAC3D,interface elements were established.Then the damage model of equivalent strain was introduced into the simulation,and the simulation process was analyzed.Finally the effects of the indenter size and loading speed on the invasion were analyzed by comparing the simulation with the test.The simulation result is consistent with the experimental observation.According to the simulation results,the rock damage is resulted from the crack propagation caused by shear inflation in the periphery of destruction nuclei under the indenter.The bigger of the radius of indenter,the more difficult to invade.And there is a nearly linear relationship between the radius of indenter and the load.Loading rate has influence on the invading work.

关 键 词：平底压头 FLAC3D 仿真 静力侵入 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]