考虑岩石脆—塑性过渡特性的地下洞室受力分析

Stress Analysis of Underground Tunnel with Consideration of Brittle-plastic Transition Behavior of the Rock

本文讨论了岩石脆—塑性过渡特性。采用川本眺万的岩石应力—应变关系曲线的理想化假设,建立了新的强度准则。在适当的假设条件下,导出了考虑该特性的圆型洞室应力状态计算公式,计算分析表明:围岩有软—弹、残—软—弹、残—塑—弹三种应力状态。

The brittle plastic transition behavior of the rock is discussed. Based on idealized rock stress-strain relationship of Toshikazu, a new strength criterion is presented. Under some proper assumptions the formulas for the stress state of the circular tunnel are obtained. The results from calculation show that there are three stress states, namely:softening-elastic, residual-softening-elastic and residual-plasticelastic.