高瓦斯煤层群保护层工作面留设煤柱合理宽度  

Reasonable coal pillar width of protective layer during high-gas coal seams mining

作　　者：徐超 李小芳 王凯 郭超飞 付强 鞠杨 XU Chao;LI Xiaofang;WANG Kai;GUO Chaofei;FU Qiang;JU Yang(Beijing Key Laboratory for Preeise Mining of Intergrown Energy and Resources,School of Emergency Managerment and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Yangquan Coal Industry(Group)Co,Ltd,Yangquan.Shanxi 045000,China)

机构地区：[1]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室煤炭资源与安全开采国家重点实验室应急管理与安全工程学院,北京100083 [2]阳泉煤业(集团)冇限责任公司,山西阳泉045000

出　　处：《中国矿业大学学报》2020年第3期445-452,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51974321,51874314,51904310)。

摘　　要：以神东矿区保德煤矿高瓦斯煤层群为工程背景,对保护层8~#煤层留设煤柱的自身稳定性及其对被保护层的卸压效果进行研究.结果表明:煤柱宽度越大,则煤柱内部塑性区占比、垂向应力、水平变形均越小,煤柱稳定性越高;煤柱下方卸压盲区中不同底板深度处的垂向应力与煤柱宽度呈不规则关系,据此将煤柱底板不同深度区域划分为垂向应力-底板埋深负相关区(底板埋深0~15 m)、垂向应力-底板埋深过渡区(底板埋深15~30 m)、垂向应力-底板埋深正相关区(底板埋深大于30 m)3个区域;煤柱宽度对完全卸压区域的范围及卸压程度几乎无影响,11~#煤层完全卸压后膨胀变形量达0.7%,最小垂向应力仅为0.57 MPa;11^#煤层卸压盲区宽度为57 m,现场实测结果与数值模拟结果基本吻合.综合考虑煤柱稳定性、被保护层卸压效果、资源回收率方面因素,建议将保护层8^#煤层中留设煤柱宽度优化为25~30 m.The high gas coal seam group of Shendong Baode coal mine was taken as the engineering background,and the stability of coal pillar retained in the protective layer coal seam 8~#and its influence on pressure relief effect of protected layer were studied.The results show that the larger the coal pillar width,the smaller the plastic zone ratio,vertical stress and horizontal deformation of coal pillar are,and the higher the stability of coal pillar is.The vertical stress at different depths of the floor rock in unloading blind zone below coal pillar is irregularly related to the width of coal pillar.The areas of coal pillar floor at different depths are divided into three regions according to the different depths of the coal pillar floor:the negative correlation zone(depth between 0 m and 15 m),the transition zone(depth between 15 m and 30 m),and the positive correlation zone(depth more than 30 m).The width of coal pillar has almost no influence on the range of complete pressure relief zone and the degree of pressure relief.The expansion deformation of coal seam 11^# is 0.7% and the minimum vertical stress is only 0.57 MPa after complete pressure relief;the width of blank zone in coal seam 11^# is 55 m.The field test results are basically consistent with the numerical simulation results.Considering the stability of coal pillar,the pressure relief effect of protected seam and the recovery rate of resources,it is suggested that the width of coal pillar in coal seam 8^# should be optimized to 25-30 m.

关 键 词：保护层开采 煤柱宽度 煤柱稳定性 卸压盲区 

分 类 号：TD712[矿业工程—矿井通风与安全]