岩土力学Issue(11)：3293-3300,3314,9.DOI:10.16285/j.rsm.2015.11.034
含裂隙岩体单轴压缩裂纹扩展机制离散元分析
DEM analyses of crack propagation in flawed rock mass under uniaxial compression
摘要
Abstract
A contact model for rock is established and imbedded into a DEM software by summarizing the bond granule tests. DEM simulation of uniaxial compression test on the pre-cracked Lac du Bonnet granite is performed, and then stress distributions are further analyzed and compared with the theoretical results. Different fracture criteria are employed to predict the crack initiation angles that are compared with theoretical ones. The results show that the failure modes obtained from DEM simulation are similar to experimental results, and stress distributions in DEM simulation are qualitatively similar to theoretical values. When the angle of pre-crack is small, the lateral stresses are compressive and tensile. The compressive strains concentrate at two edges, resulting in the tensile strains in the up-and downward cracks. When the angle of the pre-crack is large enough, the stress concentration is unobvious, leading to a discrepancy between the DEM and theoretical results. The crack extension angle resulting from uniaxial compression measured from DEM tests are in good agreement with those acquired from experimental tests. These angles are consistent with theoretical predictions by the maximum circumferential stress criterion and the maximum energy release rate criterion.关键词
离散元法/裂纹扩展/胶结接触模型/预制裂隙Key words
distinct element method/crack propagation/bond contact model/pre-existing cracks分类
数理科学引用本文复制引用
蒋明镜,张宁,申志福,陈贺..含裂隙岩体单轴压缩裂纹扩展机制离散元分析[J].岩土力学,2015,(11):3293-3300,3314,9.基金项目
国家重点基础科学研究发展计划（973）项目（No.2011BC013504，No.2014CB046901）；国家杰出青年科学基金（No.51025932）。@@@@Project supported by the National Program on Key Basic Research Project (Grant Nos.2011BC013504 and 2014CB046901) and China National Funds for Distinguished Young Scientists (Grant No.51025932) （Grant Nos.2011BC013504 and 2014CB046901）
