不同煤柱尺寸条件下采动巷道层状底板稳定性分析与控制对策  

Stability analysis and control strategy of layered floor of mining roadway under different coal pillar size

作　　者：朱晔 杨科[1] 李永亮[2] 李炜煜 孙昊 ZHU Ye;YANG Ke;LI Yongliang;LI Weiyu;SUN Hao(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Meihuajing Coal Mine,National Energy Group Ningxia Coal Co Ltd,Lingwu,Ningxia 751400,China)

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]中国矿业大学(北京)能源与矿业学院,北京100083 [3]国家能源集团宁夏煤业有限责任公司梅花井煤矿,宁夏灵武751400

出　　处：《采矿与安全工程学报》2023年第3期467-479,共13页Journal of Mining & Safety Engineering

基　　金：安徽理工大学高层次引进人才科研启动基金项目(2021yjrc39);国家自然科学基金项目(52204122);深部煤矿采动响应与灾害防控国家重点实验室开放基金项目(SKLMRDPC21KF14)。

摘　　要：煤柱尺寸对采动巷道层状底板的应力环境造成显著影响,以梅花井矿辅助运输巷为工程背景,综合采用现场调研、理论分析、数值计算和现场试验等研究方法,分析不同应力环境下层状底板的稳定性,并基于具体的工程实例提出针对性的控制对策。研究表明:在采动应力场的影响下,辅助运输巷两侧底板的应力环境存在差异,应力环境的差异性造成巷道两侧底板变形破坏的差异性。以横观各向同性体表征底板的层状特性,建立巷道底板力学计算模型,推导获得采动影响下底板任一点的应力表达式,得到煤柱的尺寸效应对底板应力环境的影响。基于摩尔-库仑准则构造层状底板破坏判据,获得不同煤柱尺寸条件下底板的破坏形态。窄小煤柱条件下,层状底板赋存于非对称应力环境,其破坏形态呈非对称马鞍形分布。煤柱尺寸增大到一定程度后,底板两侧围岩应力的差异性减小,底板破坏形态逐渐呈对称式分布。为了实现回采巷道围岩的精细化控制,支护方案应能够适应围岩应力环境的变化。根据煤柱尺寸的不同,基于围岩控制对策,提出差异化支护与对称式支护相结合的巷道围岩控制技术。数值计算和现场工程应用的结果表明,支护系统能够很好地适应围岩不同的应力环境,与围岩形成协同承载体系,支护效果良好。The coal pillar size has a significant impact on the stress environment of layered floor of mining roadway.Taking the auxiliary haulage roadway of Meihuajing Mine as the engineering background,the comprehensive research methods of on-site investigation,theoretical analysis,numerical calculation and field test are used to analyze the stability of the floor under different stress environments,and the targeted control countermeasures are proposed based on the specific engineering examples.The research shows that under the influence of mining stress field,the stress environment of the floor on both sides of the auxiliary transportation roadway is different,which causes the difference of deformation and failure of the floor on both sides of the roadway.The transversely isotropic body is used to characterize the layered characteristics of the floor.The mechanical calculation model of the roadway floor is established,and the stress expression at any point of the floor under mining influence is derived,so as to obtain the influence of the coal pillar size effect on the stress environment of the floor.Based on the Mohr-Coulomb criterion,the layered floor failure criterion is constructed,and the floor failure patterns under different coal pillar sizes are obtained.Under the condition of small coal pillar,layered floor exists in asymmetric stress environment,and its failure pattern is in an asymmetric saddle shape.When the coal pillar size increases to a certain extent,the difference in the surrounding rock stress on both sides of the floor decreases,and the failure form of the floor gradually becomes symmetrical.In order to achieve fine control of the surrounding rock of the mining roadway,the supporting scheme should be adapted to the change of the surrounding rock stress environment.According to the difference of coal pillar size,based on the surrounding rock control countermeasures,the roadway surrounding rock control technology is proposed combining differentiated support and symmetrical support.Numerical calculation a

关 键 词：采动影响 层状底板 煤柱 应力环境 差异化支护 对称式支护 

分 类 号：TD353[矿业工程—矿井建设]