论文部分内容阅读
岩体地下工程的围岩稳定评判具有复杂的非线性特征,目前尚无确定性方法量化描述局部岩体系统的塑性失稳过程.在阐释开挖扰动与局部岩体系统失稳概念的基础上,借助突变理论,提出了岩体地下工程局部围岩系统开挖失稳的能量耗散突变判据.根据能量耗散原理及弹塑性有限元算法,定义了塑性耗散能密度(PDED)和表征耗散能(RPDE)的概念.通过表征耗散能突变特征值D判断系统失稳的状态,通过单元塑性耗散能密度的分布情况判断引起失稳的大致局部部位以及塑性破坏的可能程度.对锦屏一级水电站大型地下洞室群施工开挖过程进行了稳定分析,结果表明,该判据能够量化反映洞室局部围岩系统失稳的行为过程,与工程实践较为吻合,具有一定的工程参考价值.
Rock mass stability evaluation of underground engineering has complex nonlinear characteristics, there is no certainty method to quantitatively describe the plastic instability process of local rock mass system.Based on the interpretation of the concept of excavation disturbance and local rock system instability Based on the theory of energy dissipation and the elasto-plastic finite element method, the plastic dissipation energy density (PDED) and the plastic deformation energy density The concept of dissipative energy (RPDE) is characterized by characterizing the state of destabilization of dissipative energy eigenvalue D. The distribution of plastic dissipative energy density in a cell is used to determine the approximate local parts causing instability and the possibility of plastic failure The stability analysis of the excavation process of large underground caverns at Jinping I Hydropower Station shows that the criterion can quantitatively reflect the behavior of local surrounding rock system instability in tunnel caverns and is in good agreement with engineering practice and has a certain The project reference value.