深部开采圆形巷道围岩破损区与支护压力的确定

应用经典塑性力学理论确定的圆形巷道围岩弹塑性应力场存在一些问题,这影响深部圆形巷道的稳定性评价及支护设计的合理性。应用塑性力学求解新体系确定的圆形巷道围岩弹塑性应力场准确解,进行了各向同性均质地层中圆形巷道破损区、地层残余强度与支护压力关系方面的研究,取得了如下成果:(1)破损区随开采深度的增加而增大,它们基本呈线性关系。(2)建立了支护压力与巷道埋深、围岩强度、围岩破坏后残余强度、围岩泊松比和重度之间的关系。研究成果可为支护设计提供重要参考。

Determination of failure zone and support pressure of circular roadway under deep mining

It is shown that elastoplastic stress field of circular roadway, which is given by the classic plasticity mechanics, is not correct. Therefore, it affects rationality of stability evaluation and support design of circular roadway. Based on the accurate analytic solution obtained by the new solving system of plastic mechanics, failure zone, relationship between stratum residual strength and support pressure of circular roadway are studied in isotropic and homogeneous stratum. The following results are obtained: (1) Failure zone increases as mining depth increase, which is basically a linear relation. (2) Relationship among support pressure, depth of roadway, strength and residual strength of surrounding rock, Poisson's ratio and bulk density is established. These results will be of great help to support design.