极浅埋煤层采动应力及煤柱宽度留设研究  

Study on Mining-induced Stress and Width of Coal Pillar in Extremely Shallow Buried Coal Seam

作　　者：李少刚 LI Shaogang(Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, China;State Key Laboratory of Coal Mining and Clean Utilization （China Coal Research Institute）, Beijing 100013, China)

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013

出　　处：《煤矿安全》2018年第5期222-225,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51564004;51674142)

摘　　要：针对埋深100 m左右极浅埋煤层,以西部某矿工作面开采为例,安设应力监测系统研究采动应力分布规律,分3个区域:采动轻微影响区,30 m以外区域,根据支承压力变化趋势又可分为降压区和稳压区;采动明显影响区,位于10~30 m区域,随着距离增大超前支承压力逐步降低,但总体上高于原岩应力;采动剧烈影响区,位于10 m以内区域,超前支承压力急剧增大,围岩弹性形变剧烈。侧向支承压力分布呈起伏状态,出现2个应力峰值,分别在距煤壁5 m和9 m处,侧向支承压力的影响范围11 m;两峰值间7 m处出现应力最小值,确定在5~7 m内顶板侧向断裂。最后理论结合数值模拟软件确定合理煤柱宽度15 m。This paper researches the abutment pressure based on stress monitoring system for the shallow buried coal seam about 100 m. The lead abutment pressure is obviously divided into three areas： slightly mining affected area that can divided into lower pressure zone and stable pressure zone based on the support pressure change trend is 30 m away; obviously mining affected area with the range of 10 m to 30 m, the lead abutment pressure gradually decreases with the increase of distance, but is larger than the stress of original rock; severely mining affected area within 10 m range, the lead abutment pressure increases sharply and elastic deformation of surrounding rock is severe. The lateral support pressure distribution is fluctuated and has two stress peaks, at the 5 m and 9 m near the coal wall, and its influence area is about 11 m and has the minimum at the 7 m and the roof fracture is at 5 m to 7 m. Finally,theoretical and numerical simulation software is used to determine the reasonable width of 15 m coal pillar.

关 键 词：极浅埋煤层 采动应力 数值模拟 煤柱宽度 覆岩破坏 

分 类 号：TD323[矿业工程—矿井建设]