摘要
为判断滑塌式危岩体主控结构面断裂扩展方向和稳定性,在分析压剪复合裂纹尖端应力场的基础上,运用断裂力学,建立压剪裂纹的最大剪应力断裂判据,将岩石断裂问题与岩石Mohr-Coulumb破坏准则相联系,在裂纹端部压应力区建立基于Mohr-Coulumb准则的断裂判据。实例计算结果表明,两种断裂判据与已有的最大拉应力断裂判据结合使用,讨论其最不利稳定性,分析结果与极限平衡理论方法相吻合,并给出了裂纹端部破裂面发展方向。
In order to judge the fracture initiation angle and the stability of sliding unstable rock, the maximum shear stress fracture criterion is developed according to the analysis of the stress field at the compression-shear crack tip using fracture mechanics. Combined the rock compression-shear mixed-mode crack with the rock Mohr-Coulumb criterion, a new rock fracture criterion related to Mohr-Coulumb is developed for the compressive stress area. The calculation results show that the two fracture criterions in combination with the existing maximum circumferential stress criterion are used to discuss the most unfavorable stability, which is very close to the limit equilibrium method. The new method can forecast the initiation angle at the crack tip.
出处
《水电能源科学》
北大核心
2015年第9期143-147,共5页
Water Resources and Power
基金
国家科学自然基金重点项目(41130745)
国家重点基础研究发展计划(973计划)(2013CB733202)
四川省杰出青年学术技术带头人资助计划(2012JQ0007)
四川省教育创新团队项目
关键词
滑塌式危岩体
应力强度因子
复合断裂准则
稳定性分析方法
sliding unstable rock
stress intensity factor
criteria of compound fracture
stability analysis
