深部巷道围岩分区破裂化弹塑脆性分析

考虑围岩在空间轴对称受力状态下弹性、塑性、脆性状态的转化,提出了深部围岩分区破裂化现象是围岩在特定条件下拉伸破坏与脆性张裂破坏不断重复的结果。分析了巷道围岩的弹塑性应力场,说明了支撑压力线处的环状连续拉伸破坏是分区碎裂化产生的必要条件,并给出了拉伸破坏处的半径公式。结合Griffith强度准则,推导了围岩由弹性状态转化为脆性张裂破坏的半径关系式,以此来确定破裂区范围。实例计算结果表明,破裂带的宽度和位置都与现场实际观测结果吻合较好。

Elastic-plastic-brittle analysis of zonal disintegration within rock mass in deep tunnel

Considering the conversion of rock behaviors between elastic,plastic and brittle under space axial symmetrical stress,it was put forward that the essence of zonal disintegration was the repeated alternate emergence of tensile failure and brittle tension crack failure.Tensile failure in the support pressure line was the necessary condition for zonal disintegration formation,and elastic-plastic stress field within rock mass in deep tunnel was analyzed,and a formula to determine the location of tensile failure...