孤岛工作面沿空掘巷窄煤柱合理宽度确定  

Reasonable width of narrow coal pillar in gob-side entry driving of isolated island working face

作　　者：李立 郭亚奔 刘慧妮 丁科 李宏儒 LI Li;GUO Yaben;LIU Huini;DING Ke;LI Hongru(CCTEG Coal Mining Research Institute,Beijing 100013,China;Tiandi(Yulin)Mining Engineering&Technology Co.,Ltd.,Yulin 719000,China;Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China)

机构地区：[1]中煤科工开采研究院有限公司,北京100013 [2]天地(榆林)开采工程技术有限公司,陕西榆林719000 [3]天地科技股份有限公司,北京100013

出　　处：《中国矿业》2022年第12期121-128,137,共9页China Mining Magazine

摘　　要：为了分析孤岛工作面窄煤柱合理宽度,结合某矿2102孤岛工作面工程实例,引入尖点突变模型,理论分析了煤柱合理宽度范围。建立FLAC_(3D)数值模型,模拟不同煤柱宽度时垂直应力分布状态及巷道围岩塑性区分布。理论计算结果表明:根据尖点突变模型,煤柱极限宽度需大于7.5 m。数值模拟结果表明:当煤柱宽度为6~8 m时,巷道处于低应力环境;当煤柱宽度大于8 m时,在煤柱内部开始出现集中应力,并且随着煤柱宽度增加,集中应力程度越明显。根据理论分析及数值模拟结果,最终确定2102孤岛面沿空掘巷窄煤柱宽度为8 m。现场布置矿压测站监测巷道表面位移及顶板离层量,巷道表面无明显变形,底鼓量最大280 mm,两帮位移量在130 mm以内,顶板下沉量在50 mm以内。顶板离层量较小,浅部离层量在5 mm以内,深部离层量在3 mm以内,能够保证工作面安全回采。In order to analyze the reasonable width of narrow pillar in isolated island working face,combined with the engineering example of 2102 island working face in a mine,the cusp mutation model is introduced to theoretically analyze the reasonable width range of coal pillar.FLAC_(3D) numerical model is established to simulate the vertical stress distribution and the plastic zone distribution of roadway surrounding rock under different coal pillar widths.The theoretical calculation results show that the limit width of coal pillar should be wider than 7.5 m according to the cusp mutation model.The numerical simulation results show that when the width of coal pillar is 6-8 m,the surrounding rock of the whole mining roadway is in a low stress environment.When the width of the coal pillar is wider than 8 m,the concentrated stress begins to appear inside the coal pillar,and with the increase of the width of the coal pillar,the degree of concentrated stress is more obvious.Finally,it is determined that the width of the narrow coal pillar of the 2102 isolated island working face is 8 m.Site layout of mine pressure measuring station monitoring roadway surface displacement and roof separation,no obvious deformation of roadway surface,the maximum amount of floor heave 280 mm,two-sided displacement within 130 mm,roof subsidence within 50 mm.The roof abscission layer amount is small,the shallow separation amount is within 5 mm,and the deep separation amount is within 3 mm,which can ensure the safe mining of the working face.

关 键 词：孤岛工作面 沿空掘巷 尖点突变 窄煤柱 

分 类 号：TD322[矿业工程—矿井建设]