大南湖一矿“三软”煤层回采巷道围岩破坏规律研究

Study on surrounding rock failure laws of three-soft coal seam mining roadway in Da'nanhu No.1 Mine

为掌握"三软"煤层回采巷道在工作面回采过程中的破坏规律,采用巷道表面位移监测、松动圈测试技术和钻孔窥视技术,分析了巷道围岩破坏的表面位移特征,以及巷道破坏的松动圈范围及围岩深部破坏特征。分析结果表明,采动影响下1305回采工作面回风巷巷道破坏呈整体破坏型,巷道顶底板移近量在500～1000mm之间;两帮移近量在0～400mm范围内;巷道顶板及两帮松动圈范围在2600mm以内;在1.5～2.4m范围内顶板存在离层,在4～10m范围内,孔壁相对光滑完整。分析结果为矿井回采巷道支护参数的优化提供了一定的依据。

In order to understand the failure laws of the mining roadway in the process of work face advance in three-soft coal seams,surface displacement monitoring,loosening zone testing and borehole peeping technology were used to analyze the surface displacement characteristics of surrounding rock failure,as well as the scope of loosening zone and deep failure characteristics of surrounding rock.The analysis results showed that under the influence of mining,the failure of the return air roadway in1305mining face was whole failure type,and the displacement of the roof and floor was between500~1000mm;the displacement of two sides of roadway was within400mm;the roof and the loosening circle of the roadway were within2600mm;the roof separation of the roadway was between1.5~2.4m,and the hole wall was relatively smooth and intact within4~10m.The analysis results provide a basis for the optimization of roadway support parameters.