防灾减灾工程学报2013，Vol.33Issue(1)：11-17,7.
岩石峰后脆性对圆形巷道围岩破坏及能量释放影响的数值模拟——兼谈滑移线与分区破裂化现象的差别
Numerical Simulation of the Influence of Post-peak Brittleness on the Failure and Energy Liberation in the Surrounding Rock of a Circular Tunnel——Discussion on the Difference between Slip Lines and Zonal Disintegration
摘要
Abstract
Failure zone distribution and energy liberation in the surrounding rock of a circular tunnel at different post-peak brittleness are modeled by using of FLAC. A strain-softening constitutive relation is used and a tunnel is excavated after the model is loaded to reach a static equilibrium state. Numerical results show that for more brittle rock, the number of failed elements in the surrounding rock is greater; the released elastic strain energy is higher; and the equilibrium of the surrounding rock after the tunnel excavation is later. Although some loop failure zones are observed in some examples, these zones are not believed to be related to the zonal disintegration phenomenon. It is difficult to study the zonal disintegration phenomenon using the two-dimensional slip lines or failure characteristic lines. For investigating the zonal disintegration phenomenon, we can use the three-dimensional continuous medium model based on the spatial strain localization viewpoint, or we can use the two-dimensional model including granule, in which interactions among granule exist. These two methods introduce new factors that are absent in the two-dimensional continuous medium model.关键词
岩石/峰后脆性/圆形巷道/能量释放/环向破坏区/分区破裂化Key words
rock/post-peak brittleness/circular tunnel/energy liberation/loop failure zone/zonal disintegration分类
矿业与冶金引用本文复制引用
王学滨,张智慧,潘一山,张春野..岩石峰后脆性对圆形巷道围岩破坏及能量释放影响的数值模拟——兼谈滑移线与分区破裂化现象的差别[J].防灾减灾工程学报,2013,33(1):11-17,7.基金项目
国家自然科学基金项目(50974069)、国家重点基础研究发展计划项目(2010CB226803)、辽宁省高等学校优秀人才支持计划项目(LJQ2011030)资助 （50974069）
