工程科学学报2017，Vol.39Issue(10)：1470-1476,7.DOI:10.13374/j.issn2095-9389.2017.10.002;
基于XFEM的岩体卸荷过程裂纹起裂扩展规律研究
Study on crack initiation and propagation in rock mass during unloading based on XFEM
摘要
Abstract
Rock-mass unloading often occurs during underground and slope engineering excavations. Here, rock-mass crack initi-ation and propagation during the excavation unloading progress was simulated using the extended finite element method (XFEM) in ABAQUS. Crack propagation and its influencing factors were studied and discussed after calculating the stress intensity factors at the crack tips, and by recording the crack's shape a dynamic evolution model was produced. The results show that the faster the unloading rate,the longer the crack,and the greater the crack dip angle, the easier the crack initiates. The normal stress on a crack surface de-creases while shear stress increases during unloading, and that crack propagation is mainly controlled by shear stress. This is consist-ent with the theoretical analysis. The final shape of the modeled crack was also close to the result of the physical experiments, indica-ting the reliability of this study.关键词
岩体卸荷/裂纹/起裂扩展/扩展有限单元法Key words
rock-mass unloading/crack/initiation and propagation/extended finite element method分类
建筑与水利引用本文复制引用
邓青林,赵国彦,谭彪,邹玉良,李夕兵..基于XFEM的岩体卸荷过程裂纹起裂扩展规律研究[J].工程科学学报,2017,39(10):1470-1476,7.基金项目
国家自然科学基金面上资助项目(51374244) （51374244）
