无巷旁充填支护沿空留巷顶板断裂位置研究  

Study on roof breaking location of gateway retained along goaf with no gateway sidewall backfilling and support

作　　者：殷帅峰[1] 石建军[1] 冯吉成 刘锦荣[2] YIN Shuaifeng;SHI Jianjun;FENG Jicheng;LIU Jinrong(Safety Engineering College,North China University of Science and Technology,Sanhe 065201,China;Datong Coal Mine Group Company,Datong 037000,China)

机构地区：[1]华北科技学院安全工程学院,河北三河065201 [2]大同煤矿集团有限责任公司,山西大同037000

出　　处：《煤炭科学技术》2019年第1期193-198,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51674119;51604114);河北省自然科学基金资助项目(E2016508003);中央高校基本科研业务费资助项目(3142015084)

摘　　要：针对葛泉矿1528工作面无巷旁充填沿空留巷顶板控制难题,通过建立煤层界面应力力学模型和留巷煤体塑性区演化数值模型对基本顶断裂位置进行了力学解析和数值计算,结合基本顶断裂位置影响因素关键性分析,提出了无巷旁充填沿空留巷强力切顶支架围岩控制技术。研究结果表明:距留巷煤壁2.4 m位置基本顶开始塑性破坏,且剪应力达到最大值,数值模拟结果与基于煤体弹塑性交汇位置计算得到的基本顶断裂位置基本吻合;基本顶断裂位置关键影响因素为煤层厚度、开采深度、煤层界面力学性质及应力集中系数;沿空留巷采空一侧由π型钢梁和单体液压支柱构成的强力切顶支架改变了基本顶的切落位置,卸压作用显著,保障了无巷旁充填沿空留巷的安全稳定,为地质生产条件相似矿井提供给了技术借鉴。According to the roof support problem of the gateway retained along the goaf with no gateway sidewall backfilling and support in No. 1528 coal mining face of Gequan Mine,the roof fracture position that in theory and numerical simulation and the technology of cutting roof are studied in order to improve roof status. The results show that a mechanical model of the seam interface stress is established based on the law of plastic area stress distribution. The roof fracture position in elastic-plastic intersection is derived. The simulation results show that the maximum shear stress is in 2.4 m,at the same time,the main roof began to plastic failure in 2.4 m. Based on the analysis of influencing factors that main roof fracture position,the coal thickness,mining depth,the mechanical properties of coal interface and stress concentration factor has great influence. In order to cutting roof reasonable,adopted strength combination support to curtting roof and observed the fracture line. It proved that the supporting is effective to form rational overhang length of the roof. The research provides a reference for stable control of surrounding rock of the gob-side entry retaining with no roadside filling support.

关 键 词：沿空留巷 无巷旁充填支护 断裂位置 切顶卸压 

分 类 号：TD323[矿业工程—矿井建设]