基于数值模拟分析的上邻近煤层底板损伤特征研究  

Research on the Floor Damage Characteristics of an Upper Adjacent Coal Seam Based on Numerical Simulation

作　　者：李巍 阮泽宇 郭亚超 吴来伟 张鹏[1] 余宏 LI Wei;RUAN Zeyu;GUO Yachao;WU Laiwei;ZHANG Peng;YU Hong(School of Mining Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州市221116

出　　处：《矿业研究与开发》2021年第3期70-74,共5页Mining Research and Development

基　　金：国家重点研发计划项目(2018YFC0604705).

摘　　要：针对保护层开采技术中高瓦斯低渗透性煤层的卸压增透问题,利用UDEC离散元数值模拟软件,对上邻近煤层开采所造成的底板损伤进行了研究,并分析了底板损伤对下煤层瓦斯迁移的影响规律。研究表明:底板在工作面后方一定范围内会出现倒三角形应力降低区;依据底板破坏的力学机理不同,将底板裂隙带分为拉伸破坏裂隙带和屈服破坏裂隙带;2#煤层开采产生的底板裂隙促进了3#煤层瓦斯的解析及迁移,有效降低了3#煤层开采时的瓦斯涌出量,保障了工作面的安全生产。Aiming at the problem of pressure relief and permeability enhancement of coal seams with high gas and low permeability in protective coal seam mining,UDEC discrete element numerical simulation software was used to study the floor damage caused by the mining of upper adjacent coal seam.Then,the influence laws of floor damage on gas migration of lower coal seam was analyzed.The research results show that,the floor in a certain range behind the working face will appear a stress reduction zone as an inverted triangle;according to the different mechanical mechanisms of floor failure,the floor fracture zone can be divided into tensile failure fracture zone and yield failure fracture zone;the floor fracture produced by 2# coal seam mining promotes the release and migration of 3# coal seam gas,effectively reduces the gas emission of 3# coal seam mining,and ensures the safety production of working face.

关 键 词：UDEC数值模拟 邻近煤层 底板损伤 保护层开采 

分 类 号：TD822[矿业工程—煤矿开采]