孤岛煤柱下沿空掘巷底鼓机理及控制技术  

Study on Floor Heave Mechanism and Control Technology for Goaf-Side Gateway Driving Under Coal Pillars of Seam Island

作　　者：李文峰[1] 柏建彪[1] 伊西锋[2] 胡忠超[1] 师建新 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221008 [2]北京华宇工程有限公司,北京100120 [3]神华乌海能源有限责任公司平沟煤矿,内蒙古乌海016000

出　　处：《煤炭科学技术》2010年第4期17-20,共4页Coal Science and Technology

基　　金：国家自然科学基金资助项目(50774077);全国博士学位论文作者专项资金资助项目(200760);煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM08X04)

摘　　要：针对孤岛煤柱下沿空掘巷围岩应力大、巷道底鼓严重的问题,分析了巷道围岩性质、工作面动压、沿空掘巷窄煤柱宽度、孤岛煤柱集中应力等对巷道底鼓的影响,通过数值计算得到该类巷道具有围岩塑性区分布大、最大主应力等值线远离底板、底板岩层易挤压流动造成巷道剧烈底鼓等特点。在分析平沟煤矿1603轨道平巷底板浅部围岩位移特点的基础上,提出采用2根底角锚杆、2根底板锚杆的加固法控制巷道底鼓,现场观测表明,该支护方案加固后巷道底鼓量减小65%,取得了良好的控制效果。According to the problems of the high surrounding rock stress and serious floor heaves occurred in the goaf side gateway driving under the coal pillars in the seam island, the paper analyzed the properties of the gateway surrounding rocks, mining pressure of the coal mining face, the width of the narrow pillar in the goal side gateway driving, the concentrated stress on the coal pillars of the seam island and others affected to the floor heave of the gateway. The numerical calculation had obtained the features that gateway would have large distribution of the plastic area in the surrounding rocks, the max main stress equivalence line would be far from the floor and the floor stra- ta would be easy to squeeze and flow to cause the serious heave in the gateway. Based on the analysis on the displacement features of the surrounding rocks under the floor of the No. 1603 railway roadway in Pinggou Mine, the reinforcement method with two bottom anchored bolts and two floor bolts were proposed to control the floor heave of the roadway. The site observation showed that after the reinforcement of the method implemented, the floor heave could be reduced by 65% with good control results.

关 键 词：孤岛煤柱 沿空掘巷 底鼓机理 底鼓控制 

分 类 号：TD322.5[矿业工程—矿井建设]