机械扩孔煤体增透应力变化规律研究  

Study on stress change law of coal body permeability improvement by mechanical reaming

作　　者：王海春 雷东记[2] 代振华 覃杰[4] WANG Haichun;LEI Dongji;DAI Zhenhua;QIN Jie(Coal Transportation Department,National Energy Group,Beijing 100011,China;College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;China Coal Technology&Engineering Xi’an Research Institute(Group)Co.,Ltd,Xi’an 710077,China;Chinese Institute of Coal Science,Beijing 100013,China)

机构地区：[1]国家能源集团煤炭运输部,北京100011 [2]河南理工大学安全科学与工程学院,河南焦作454000 [3]中煤科工西安研究院(集团)有限公司,陕西西安710077 [4]煤炭科学研究总院,北京100013

出　　处：《煤矿安全》2024年第1期28-33,共6页Safety in Coal Mines

基　　金：国家能源集团2021年度科技资助项目(GJNY-21-132);国家自然科学基金青年科学基金资助项目(51704101)。

摘　　要：机械扩孔作为一种新型煤层卸压增透强化措施,可广泛适用于低透气性瓦斯煤层。为了探究机械扩孔应力演化规律,通过理论分析,揭示机械扩孔应力分布特征,以车集煤矿2616煤层为研究背景,借助ABAQUS数值模拟软件分析扩孔过程中煤层应力演化规律。结果表明:机械扩孔后孔洞周围煤体应力场存在动态演化过程,由内向外呈圆环状分布,依次为破碎区、塑性区、弹性区和原始应力区;机械扩孔过程中造穴阶段应力扰动范围和应力集中情况都显著大于钻进阶段。Mechanical reaming,as a new type of coal seam pressure relief and permeability enhancement measure,can be widely applied to low permeability gas coal seams.In order to investigate the stress evolution law of mechanical reaming,the stress distribution characteristics of mechanical reaming were revealed through theoretical analysis;taking 2616 coal seam of Juji Coal Mine as the research background,the stress evolution law of coal seam during the reaming process was analyzed by ABAQUS numerical simulation software.The results show that:there is a dynamic evolution of the stress field of the coal body around the hole after mechanical reaming,which is distributed in a circular pattern from inside to outside,in the order of fracture zone,plastic zone,elastic zone and original stress zone;the stress disturbance range and stress concentration in the hole-making stage during mechanical reaming are significantly larger than those in the drilling stage.

关 键 词：瓦斯抽采 卸压增透 机械扩孔 应力分布 破煤效果 

分 类 号：TD713[矿业工程—矿井通风与安全]