深部煤层采空区下巷道支护技术  

Support technology for gateway under goaf in deep coal seams

作　　者：方保明 FANG Baoming(Cuncaota Coal Mine,Shendong Coal Group of CHN Energy Investment,Ordos 017200,China)

机构地区：[1]国家能源集团神东煤炭集团寸草塔煤矿,内蒙古鄂尔多斯017200

出　　处：《煤矿安全》2021年第12期121-127,共7页Safety in Coal Mines

摘　　要：为有效控制深部煤层采空区下回采巷道变形失稳破坏,以隆德煤矿209工作面运输巷为例,采用现场监测、理论分析及数值模拟的方法,对采空区下回采巷道进行力学分析,同时提出巷道采用"注浆+全锚索支护+架棚"的联合支护方案,并给出注浆及支护参数。研究结果表明:在高水平应力影响下,巷道围岩发生弯曲拉伸组合破坏,围岩所受拉应力大于煤岩体自身抗拉强度,巷道产生变形失稳;巷道支护后围岩塑性区面积明显缩小,顶底板应力集中范围减小;巷道表面移进量得到有效控制,巷道围岩变形速率在一万步左右后趋于稳定,顶底板位移量以及两帮位移量在两万步数后基本稳定,巷道支护效果较好。To effectively control the deformation and instability failure of the mining gateway under the goaf in deep coal seams,taking the case of 209 working face transportation roadway in Longde Mine and adopting the mechanics of the roadway under goaf by field monitoring,theoretical analysis and numerical simulation,a combined support technology with grouting,full anchor cable and rack shed is proposed,and then the grouting parameters and support parameters are proposed.Research indicates that under the influence of great horizontal stress,the surrounding rock of the roadway was experienced bending and tensile failure,the roadway is deformed and unstable when tensile stress of surrounding rock is greater than the tensile strength of the coal rock;the area of the surrounding plastic zone was significantly reduced,and the stress concentration range of the roof and floor is decreased;the surface displacement of the roadway is effectively controlled after the support of the roadway,the deformation rate of the surrounding rock of the roadway tends to be stable after ten thousand steps,and the displacement of the roadway are basically stable at two thousand steps,the supporting effect is relatively efficiency.

关 键 词：采空区 水平应力 回采巷道 联合支护 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]