马蹄形洞室围岩稳定性结构面倾角效应分析

为了分析不同倾角结构面对马蹄形洞室围岩稳定性的控制机理,文章运用数值模拟的方法分析了15°、30°、45°、60°、75°5种典型倾角结构面横穿马蹄形洞室断面时围岩应力分布、围岩位移的特征,探讨了结构面产状控制围岩变形与破坏的机理。通过对应力场和位移场的分析可知:当结构面倾角小于等于60°时,塑性区随结构面倾角的增大不断减小;当结构面倾角大于60°时,塑性区随倾角增大而增大;在结构面倾角为60°时,洞室围岩的塑性区最小,相对稳定。

Analysis of dip effect of structural plane on stability of the surrounding rock of horseshoe section cavern

This paper aims to analyze the control mechanism of structural planes with different obliquities on the stability of the surrounding rock of horseshoe section cavern.The numerical simulation is made to study the characteristics of stress distribution and displacement of the surrounding rock of horseshoe section cavern,which is crossed by structural planes with five typical different obliquities including 15°,30°,45°,60°,and75°.And the deformation and fracture mechanism of the surrounding rock under different occurrence of structural planes are also investigated.Through the analysis of stress field and displacement field,some results are summarized as follows:when the obliquities of structural plane are smaller or equal to 60°,with the increase of inclination angle,the plastic zone decreases;when the obliquities of structural plane are larger than 60°,the plastic zone increases with the increase of inclination angle;the plastic zone reaches its minimum value when the obliquity of structural plane is equal to 60°.