坚硬顶板下综放工作面过空巷关键技术  

Key Technology of Fully Mechanized Workface Passing Through Abandoned Roadway with Hard Roof

作　　者：孙晓明[1,2] 张勇[1,2] 吴修光[3] 桂兵[3] 卢昊[1,2] 杨鸣鹤[2] 

机构地区：[1]中国矿业大学(北京)深部岩石力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]兖矿集团有限公司济宁三号煤矿,山东济宁272169

出　　处：《煤矿安全》2017年第4期87-91,共5页Safety in Coal Mines

基　　金：国家自然科学基金面上资助项目(51374214);国家重点研发计划资助项目(2016YFC0600901)

摘　　要：针对工作面过空巷易出现矿压显现剧烈及空巷围岩大变形等问题,基于岩层运动中心建立的矿山压力理论为指导思想,以切顶短臂梁为理论基础,提出了综放工作面过空巷切顶卸压+恒阻大变形锚索支护技术。利用理论分析和数值模拟的方法分析了巷道围岩的稳定性、估算出周期来压步距及构建空巷理论力学模型,通过预裂爆破和等压小煤柱技术,使得超前支撑压力峰值处于空巷前方的煤壁深处,同时结合恒阻大变形锚索耦合支护技术控制巷道顶板的大变形。数值模拟结果显示,工作面周期来压步距约23.4 m,周期来压时超前支承压力位于煤壁前方12 m处。It is prone to some problems such as strata pressure, surrounding rock deformation when workface passes through aban-doned roadway. The guiding ideology is the theory of mining pressure, which is established by the center of rock strata movement.The theoretical basis of the research is the theory of cut-roof short arm beam. We propose the supporting technology of cuttingroof pressure relief ＋ constant resistance large deformation anchor cable when the comprehensive workface passes thrlgh aban-doned roadway. By the means of theoretical analysis and numerical simulation, we analyzed the stability of roadway surroundingrock, estimated periodic weighting step distance and structured theoretical mechanics model of the construction of abandoned road-way. Through the pre-splitting blasting and isopiestic technique, the peak of advanced support stress shifted to the depth of thecoal wall. The constant resistance large deformation anchor cable controlled the deformation of surrounding rock. Numerical simula-tion results show that the pressure step distance of workface is about 23.4 m and the advanced support stress is located at 12 min front of the coal wall.

关 键 词：围岩大变形 短臂梁 切顶卸压 恒阻大变形锚索 耦合支护 

分 类 号：TD322[矿业工程—矿井建设]