深部煤巷开掘断面优化的数值模拟研究

Numerical simulation study on coal roadway section optimization of deep coal mining

从深部煤巷的赋存条件为入手,测试分析了刘庄煤矿深部煤巷的围岩力学特性,比较了直墙三心拱、矩形、直墙拱3种断面的围岩稳定性,从塑性区、垂直位移及垂直应力分布分析得到,当巷道为三心拱、直墙拱、矩形时,巷道顶板塑性区为1.5、2.5、1.5 m,底板塑性区宽度为1、1.5、1 m,两帮塑性区宽度1、2、1.5 m;垂直应力分别为21、21.7、22.2 MPa;顶底板移近量分别为40.8、85、100 mm,综合分析得到深部煤巷开掘为直墙三心拱形断面最为有利,为类似条件巷道开掘断面优化提供了借鉴。

Based on coal seam occurrence conditions,the mechanical characteristics of the surrounding rock were tested and analyzed.The stability of surrounding rock in three sections of straight wall arch,rectangular arch and straight wall arch were compared.By analysis of the plastic zone,vertical displacement and vertical stress distribution,the width of the plastic zone of the top plate was 1.5 m,2.5 m,1.5 m,and the width of the plastic zone of the floor 1 m,1.5 m,1 m,and the width of the plastic zone of the two sides was 1 m,2 m,1.5 m;the vertical stress was 21 MPa,21.7 MPa,22.2 MPa,and the top and bottom plate displacement was 40.8 mm,85 mm,and 100 mm respectively.The most favorable section in deep coal mining was straight wall and three-core arch,and this provided reference for the optimization of mining under similar conditions.