渗流作用下非均匀应力场巷道围岩稳定性分析

将巷道围岩视为多孔介质,考虑地下水渗流作用的影响,应用弹塑性理论,分析了非均匀应力场圆形巷道围岩的力学性态,推导出了非均匀应力场下圆形巷道弹塑性的解析解,基于Mo-hr-Coulumb强度准则,得出了渗流作用下巷道围岩的塑性区边界线方程,并通过具体实例,对比分析了当λ=0.5时渗流作用对应力场的径向应力与切向应力在巷道两帮和顶底板的分布情况。研究表明,考虑渗流作用,对应力场的影响作用更为显著。

Surrounding Rock Mass Stability Analysis of Non-uniform Stress Field Under the Action of Seepage

As porous medium,rocks are affected by ground water permeation.Elasto-plastic theory is used to analyze mechanical behaviors of the non-uniform stress field of circular tunnels and the circular tunnels elasto-plastic theoretical solution of non-uniform stress field is deduced.Base on the Mohr-Coulumb failure criterion,the boundary line equation of surrounding rock mass plastic zone under non-uniform stress field on the action of seepage is deduced.Through comparing whether the stability of surrounding rock was under the action of seepage or not,it obtains that the influence of seepage field on stress field is more intensive than without considering seepage when side pressure coefficient is 0.5.The study demonstrates that the influence of seepage field on stress field is intensive.