不同侧压巷道塑性区变异性特征模拟分析

Variability Characteristics Simulation of Roadway Plastic Zone in Different Side Pressure Coefficients

侧压系数λ对巷道围岩稳定影响较大,在不同侧压系数作用下开挖巷道围岩的破坏区形态和范围均不同。应用数值模拟方法,分析了不同侧压系数条件下埋深分别为400 m和800m圆形巷道塑性区分布特征,并提出了相应的巷道支护对策。结果表明:λ=1时,巷道围岩塑性区为圆形;λ>1时,巷道围岩塑性区为竖椭圆形;λ<1时,巷道围岩塑性区为横椭圆形;λ>1时巷道支护应以控制顶底板为主,λ<1时巷道支护应以控制两帮为主;相同侧压时埋深越大巷道围岩塑性区范围越大,但增长幅度与埋深呈非线性关系。

Side pressure coefficient has a greater impact on the stability of roadway surrounding rock,the shape and scope of plastic zone of roadway surrounding rock is different in different side pressure coefficients. Applying the method of numerical simulation,plastic zone distribution characteristics of roadway were analyzed with different side pressure coefficient under the condition of buried depth400 m and 800 m,and the corresponding support countermeasure of roadway was proposed. The simulation results show that： when λ= 1,plastic zone of roadway surrounding rock was circular; when λ 〉 1,plastic zone of roadway surrounding rock was vertical ellipse;when λ 〈 1,plastic zone of roadway surrounding rock was transverse ellipse; when λ 〉 1,roadway support should give priority to control the roof and floor mainly; when λ 〈 1,roadway support should give priority to control the side wall mainly. When the greater depth of roadway surrounding rock plastic zone is larger in the same side pressure coefficient,but the growth rate is non-linear relationship with buried depth.