松软围岩底抽巷变形破坏影响因素模拟研究

Simulation study on influencing factors of deformation and failure of floor pumping roadway of soft surrounding rock

大众矿21上01工作面底板抽放巷埋深600 m,存在巷道变形量大、锚索锚网断裂严重等问题。针对上述问题,通过数值模拟方法分析了不同巷道断面形状的稳定性,对大众矿底板抽放巷进行合理断面设计,确定合适的巷道断面形状。通过对该地质条件下的不同巷道断面的应力分布、围岩塑性区分布进行分析,初步确定巷道形式为直墙半圆拱形。通过分析直墙半圆拱形巷道在不同地应力和巷道性质下巷道塑性区分布、巷道垂直应力、巷道围岩位移,确定地应力和巷道性质对巷道稳定性的影响,为煤矿井下施工提供依据。

The buried depth of the floor pumping roadway in the No.21 working face of Dazhong Mine is 600 m,and there are problems such as large deformation of the roadway and serious fracture of the anchor cable and anchor network.In view of the above problems,the stability of different roadway cross-section shapes by numerical simulation method was analyzed,and reasonable cross-section design of Dazhong Mine floor pumping roadway was carried out to determine the appropriate section shape of roadway.Through the analysis of the stress distribution of different roadway cross-sections and the plastic zone distribution of surrounding rock under this geological condition,the roadway form was determined to be straight wall semi-circular arch.By analyzing the distribution of roadway plastic zone,vertical stress and displacement of surrounding rock under different ground stress and roadway properties,the influence of ground stress and roadway properties on roadway stability was determined,which can provide a basis for underground construction of coal mine.