特厚煤层开采覆岩裂隙演化数值模拟研究  

Numerical simulation study on evolution of overlying rock fractures ofextra thick coal seam mining

作　　者：马文新 张乐 丁宏磊 郭明杰[2] 李小军[2] Ma Wenxin;Zhang Le;Ding Honglei;Guo Mingjie;Li Xiaojun(Kuangou Coal Mine,Xinjiang Energy Co.,Ltd.,CHN Energy Group,Changji 831100,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]国家能源集团新疆能源有限责任公司宽沟煤矿,新疆昌吉831100 [2]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《能源与环保》2024年第9期275-280,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金面上项目资助(52374086)。

摘　　要：煤层开采造成覆岩破坏及裂隙演化发育,因采动卸压而释放的瓦斯在裂隙通道内流动、汇聚,给工作面生产带来了严重威胁。采用3DEC数值模拟实验,以宽沟矿B2特厚煤层工作面开采为原型,对采动覆岩应力演化规律进行了模拟研究,得到了采动覆岩应力演化的4阶段分布特征;在以覆岩卸压系数表征裂隙发育程度的基础上,绘制了裂隙富集区域的动态演化过程;并通过分析采动覆岩破坏及裂隙发育特征,在裂缝带高度范围内沿水平方向将采动覆岩裂隙划分为4个区域,分别为压密裂隙区、结构裂隙区、拉张裂隙区和原岩裂隙区。采动覆岩裂隙演化及区域的划分可为矿井布置钻孔抽采采空区卸压瓦斯,从而消除安全隐患,实现瓦斯资源化利用提供技术参考和依据。Coal seam mining causes damage to the overlying rock and the evolution and development of fractures.The gas released due to mining pressure relief flows and accumulates in the fracture channels,posing a serious threat to the production of the working face.The 3DEC numerical simulation experiments were adopted,based on the mining of the B2 thick coal seam working face in Kuangou Coal Mine,the stress evolution law of the mining overlying rock was simulated and studied,and the four stage distribution characteristics of the stress evolution of the overlying rock was obtained.On the basis of characterizing the degree of fracture development using the overburden pressure relief coefficient,the dynamic evolution process of the fracture enrichment area was plotted.And by analyzing the characteristics of mining overlying rock failure and fracture development,the mining induced overlying rock fractures were divided into four zones along the horizontal direction within the height range of the fractured zone,namely:compaction fractured zone,structural fractured zone,tensile fractured zone,and original fractured zone.The evolution of mining overlying rock fractures and the division of zones can provide technical reference and basis for arranging boreholes to extract gas from the goaf,thereby eliminating safety hazards and achieving the utilization of gas resources.

关 键 词：特厚煤层开采 数值模拟 覆岩破坏 裂隙演化 区域划分 

分 类 号：TD325[矿业工程—矿井建设]