厚煤层软底沿空留巷充填体选择研究与应用

Research and Application of Filling Body Selection for Gob-side Entry Retaining in Soft Bottom Thick Coal Seam

为对某煤矿N1202工作面厚煤层软底情况下沿空留巷的安全稳定性提供支持,现就此情况建立底鼓和顶板破断力学模型并做计算分析,对顶板破坏位置和帮部变形进行理论分析。分析结果表明,增大充填支护体的强度和宽度是最为有效的手段,N1202工作面采用C30强度的混凝土设置充填体宽度为1.5 m时即可安全留巷。该研究结果可为N1202工作面厚煤层软底情况下充填支护布置提供理论依据。

In order to provide support for the safety and stability of gob side entry retaining under the condition of thick coal seam soft bottom in N1202 working face of a coal mine,the mechanical models of floor heave and roof fracture are established to calculate and analyze in this case,and the theoretical analysis of roof failure location and wall deformation is carried out.The analysis results show that the most effective means is to increase the strength and width of the filling support body.When the filling body width is 1.5 m with C30 strength concrete in N1202 working face,the roadway can be safely reserved.The research results can provide a theoretical basis for the arrangement of filling support in the thick coal seam of N1202 working face under the condition of soft floor.