煤柱留设宽度对密闭墙稳定性的影响研究  

Study on Influence of Reserved Width of Coal Pillars on Stability of Airtight Wall

作　　者：韦四江[1] 王生柱 李鑫鹏 WEI Sijiang;WANG Shengzhu;LI Xinpeng(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003

出　　处：《煤炭技术》2023年第12期1-5,共5页Coal Technology

基　　金：国家自然科学基金项目(51974104,52174074);2022年度河南省科技攻关计划项目(222102320183,212102210230)。

摘　　要：为研究煤矿资源枯竭条件下大巷煤柱的安全回收问题,采用理论分析和数值模拟的方法对采空区密闭墙在超前和侧向支承压力共同作用下的稳定性进行研究。结果表明:密闭墙体应避开支承压力峰值区,其临界宽度为26.4 m。当煤柱回收工作面运输巷距密闭墙的距离L=8 m时,密闭墙体所处的煤柱宽度为36.1 m,其稳定性、承载能力满足回采要求。数值模拟分析表明,当L=8 m时,密闭墙体的塑性区、位移等均在合理的范围内。工程实践表明:在工作面推进到距密闭墙体5 m时,密闭墙体和附近煤体基本稳定,密闭墙气密性良好,能够保证工作面安全回采。To study the safe recovery of coal pillars in the main roadway under the condition of coal mine resource depletion,the stability of the airtight wall in the goaf under the combined action of advance and lateral abutment pressure was studied by theoretical analysis and numerical simulation.The results show that the airtight wall should avoid the peak area of bearing pressure,and its critical width is 26.4 m.When the distance between the transportation roadway of the coal pillar recovery face and the airtight wall is L=8 m,the width of the coal pillar where the airtight wall is located is 36.1 m,and its stability and bearing capacity meet the mining requirements.The numerical simulation analysis shows that when L=8 m,the plastic zone and displacement of the airtight wall are within a reasonable range.The engineering practice shows that when the working face is advanced to 5 m away from the airtight wall,the airtight wall and the surrounding coal body are basically stable,and the airtightness of the airtight wall is good,which can ensure the safe mining of the working face.

关 键 词：密闭墙 煤柱 稳定性 承载能力 数值模拟 

分 类 号：TD726[矿业工程—矿井通风与安全]