摘要
针对岳城矿大巷煤柱回收工作面在回采过程中面临过空巷的技术难题,空巷内会出现顶板压力大、冒顶严重等问题,影响工作面的正常回采,以岳城煤矿大巷煤柱回收工作面为研究背景,通过理论计算得到了空巷支护强度应大于6.03 MPa,并采用数值模拟对不同支护强度下巷道的顶板应力及位移进行了分析,确定了当顶板支护强度达到7 MPa及以上时,空巷顶板下沉量可以控制在合理的范围内。空巷支护采用木垛支护,采用数值模拟对不同支护排距下空巷的顶板应力及位移进行了分析,确定选取0.7 m排距、1.5 m×3 m×3 m的联锁木垛可以满足综放工作面过空巷段的支护要求。现场矿压监测结果表明,当空巷顶板支护强度达到7 MPa及以上时,可以满足工作面安全生产要求,实现岳城矿大巷煤柱回收工作面的安全高效回采。
In view of the technical difficulties of passing through empty roadways faced by the coal pillar recovery working face in the main roadway of Yuecheng Mine during the stoping process,problmes such as high roof pressure,severe roof caving and others will happen inner empty roadways,which affect the normal stoping of the working face,taking the coal pillar recovery working face in the main roadway of Yuecheng Coal Mine as the research background,through theoretical calculation,it is concluded that the support strength of the empty roadway should be greater than 6.03 MPa.Numerical simulation is used to analyze the roof stress and displacement of the roadway under different support strengths,and it is determined that when the support strength of the roof reaches 7 MPa or above,the subsidence amount of the empty roadway roof can be controlled within a reasonable range.The support of the empty roadway adopts wooden stacks,and numerical simulation is used to analyze the roof stress and displacement of the empty roadway under different support row spacings.It is determined that selecting interlocking wooden stacks with a row spacing of 0.7 m and 1.5 m×3 m×3 m can meet the support requirements of the fully mechanized caving face passing through the empty roadway section.The on-site mine pressure monitoring results show that when the support strength of the roof of the empty roadway reaches 7 MPa or above,it can meet the safety production requirements of the working face and achieve safe and efficient stoping of the coal pillar recovery working face in the main roadway of Yuecheng Mine.
作者
潘瑞
徐大龙
顾伟
Pan Rui;Xu Dalong;Gu Wei(Shanxi Jinmei Group Qinxiu Coal Industry Co.,Ltd.Yuecheng Coal Mine,Shanxi Qinshui 048200;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Jiangsu Xuzhou 221116)
出处
《山东煤炭科技》
2024年第7期23-28,共6页
Shandong Coal Science and Technology
关键词
孤岛工作面
过空巷
木垛支护
数值模拟
矿压监测
isolated island working face
passing through empty roadway
wooden stack support
numerical simulation
mine pressure monitoring
