以某矿巷式充填开采为工程背景,采用理论计算和数值模拟的方法,分析合理充填体强度。结果表明:理论计算得出充填体合理强度6.67 MPa,数值模拟以隔离煤柱垂直应力和充填体上方顶板下沉量为依据,模拟结果得出充填体合理强度应为0.6~0.8倍的煤体强度,即6~8MPa,2种方法得到的结果相近,因此设计充填体强度为6~8 MPa。 Based on the engineering background of alluvial mining in a certain mine, the strength of reasonable filling body is analyzed by theoretical calculation and numerical simulation. The results show that the theoretical calculation results in a reasonable strength of the filling body of 6.67 MPa. Based on the numerical simulation of the vertical stress of the coal pillar and the subsidence of the roof above the filling body, the simulation results show that the reasonable strength of the filling body should be 0.6 to 0.8 times Strength, ie, 6 ~ 8MPa, the results obtained by the two methods are similar, so the design of the filling body strength of 6 ~ 8 MPa.