中文摘要：

文章针对静水压力作用下的弹-脆-塑性圆形巷道，采用弹塑性耦合模型进行了围岩应力和位移的解析研究，采用线性的Mohr-Coulomb准则和非关联流动法则推导了圆形巷道岩体应力和变形解析解；从理论上确定了峰值后区岩石的强度参数与弹性模量之间的限定性关系，分析了不同峰后弹性模量劣化程度下圆形巷道围岩应力和变形规律。研究结果表明，弹性模量的劣化不会改变围岩塑性区范围和应力分布状态，但会引起围岩变形量的剧增。

英文摘要：

In this paper, aimed at the elasto-brittle-plastic circular opening under hydrostatic pressure, an elas-to-plastic coupling model was adopted for an analytical study of stress and displacement of the surrounding rock. And based on the linear Mohr-Coulomb criterion and the non-associated flow rule, the analytical solution of the rock stress and deformation was deduced, thus determining theoretically the restrictive relationship between strength parameter and elasticity modulus in the post-failure region and giving the rules of rock stress and defor-mation in the post-failure region under different modulus deterioration conditions. The results show that the mod-ulus deterioration may not result in variation of the plastic zone scope and the rock stress distribution, but it may contribute to the surge of rock deformation.