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以唐口煤矿深部圆形巷道为例,分别以该巷道的实际形状和光滑圆形为几何边界条件,采用有限元软件ANSYS模拟计算巷道开挖后围岩的应力分布和塑性区范围。结果表明:光滑圆形断面下围岩塑性区范围与基于Drucker-Prager准则推出了解析解相接近;非规则断面下两帮围岩局部破坏,塑性区范围为1.33R_0,45°方向塑性区范围为2.08R_0,大于简化断面的模拟计算值和理论解。因此,评价围岩稳定性必须考虑几何的非规则性所导致的应力集中效应,这对于开挖边界附近的塑性区发展过程产生重要影响。
Taking Tangkoukou deep circular roadway as an example, the finite element software ANSYS was used to simulate the stress distribution and the plastic zone range of the surrounding rock after excavation respectively, taking the actual shape and smooth circle as the geometric boundary conditions. The results show that the plastic zone of the surrounding rock under the smooth circular section is close to the analytic solution based on the Drucker-Prager criterion. The partial destruction of the surrounding rock under the irregular section has the plastic zone in the range of 1.33R_0 and 45 ° Is 2.08R_0, which is larger than the calculated value and theoretical solution of simplified section. Therefore, the evaluation of the stability of surrounding rock must consider the stress concentration effect caused by geometric irregularities, which has an important influence on the development of plastic zone near the excavation boundary.