节理岩体剪切试验的非连续变形方法分析  

DDARF analysis of shear tests of jointed rock mass

作　　者：朱维申[1] 周浩[1] 李邦翔[1] 郭帅[1] 张敦福[1] 李超[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《水文地质工程地质》2015年第5期49-53,共5页Hydrogeology & Engineering Geology

基　　金：教育部博士点专项基金项目(20130131110033);国家自然科学基金项目(51279095;41072234)

摘　　要：参照前人对含断续节理岩体所做剪切模型试验的结果,采用改进的非连续变形分析方法 (Discontinuous Deformation Analysis for Rock Failure,DDARF)对剪切试验进行数值模拟。从破裂现象看,仿真计算和模型试验结果相符良好。随后又对断续节理做雁形排列变化,研究对比了不同阶梯状排列裂隙的模型破裂现象及相应的模型峰值剪切强度。研究结果表明,裂隙扩展的过程始于预制裂隙两端的张力裂纹,随着张力裂隙的扩大在其附近生成许多细微裂纹,这些裂纹的贯通导致了模型的最终破坏。On the basis of previous studies of shear tests for jointed rock mass, numerical simulation of shear tests is carried out by the improved DDARF （discontinuous deformation analysis for rock failure）. The results of the fracture phenomenon show high compatibility with the model test. Different fracture phenomena and peak shear strength testing are explored under the condition of different ladder style arrangement of cracks. The preset cracks generate at the two ends of the tension crack, which continue to expand and is accompanied by the many fine cracks in the near parts. These cracks break through to each other and cause the model a final failure.

关 键 词：数值模拟 剪切试验 DDARF 裂隙扩展 峰值剪切强度 

分 类 号：TU457[建筑科学—岩土工程]