不同岩性组合条件下顶板采动效应研究  

Study on Roof Mining Effect under Different Lithologic Combinations

作　　者：林健云 左宇军[1,2,3,4] 王浩 于美鲁[5] 税越 戴亦军 刘荣波 LIN Jianyun;ZUO Yujun;WANG Hao;YU Meilu;SHUI Yu;DAI Yijun;LIU Rongbo(Mining College, Guizhou University, Guiyang 550025, China;School of Mechanics and Civil Engineering,China University of Mining and Technology, Beijing 100083, China;National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;Guizhou Key Laboratory of Comprehensive Utilization of Non -metallic Mineral Resources, Guizhou University,Guiyang 550025, China;Engineering Center for Safe Mining Technology under Complex Geologic Condition,Guiyang 550025, China;China Construction Tunnel Corporation, LTD., Chongqing 400000, China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳550025 [3]贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025 [4]复杂地质矿山开采安全技术工程中心,贵州贵阳550025 [5]中国矿业大学(北京)力学与建筑工程学院,北京100083 [6]中建隧道建设有限公司,重庆400000

出　　处：《贵州大学学报（自然科学版）》2019年第2期44-49,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目资助(51574093; 51774101);贵州省高层次创新型人才培养项目资助(黔科合人才(2016)4011号);中建股份科技研发课题资助(CSCEC-2017-Z-28)

摘　　要：针对工作面回采后采动顶板稳定性的问题,通过FLAC3D数值模拟软件建立8种不同岩性组合条件下顶板采动效应模型,研究不同组合条件下采动顶板的应力和位移分布变化规律。研究结果表明:顶板全为硬岩时顶板垂直集中应力最大,全为软岩时最小;顶板的剪应力集中区主要位于上覆岩层的硬岩中,剪应力最大组合顶板类型为软-硬-软-硬组合;在不同岩性组合顶板条件下,顶板为软岩时其变形量远大于顶板为硬岩及软硬岩结合时的变形量;相同顶板条件下随着距离的加大,顶板垂直位移量呈现降低趋势。研究结果可为工作面布置方式和顶板支护方式的选择提供参考依据。Aimed at mining-induced roof stability problem after coal face mining,the FLAC3 D numerical simulation software was used to build mining-induced roof effect models under eight different lithologic combinations to investigate the stress,and displacement distribution of the mining roof. The results show the vertical concentration stress of the top plate reaches its maximum when the roof is all hard rock and the stress falls to its minimum when the roof is soft;the shear stress concentration area of the roof covers the hard rock of the overlying rock stratum.The type of roof with the maximum sheer stress is the soft-hard-soft combination. Under different lithologic combinations,the roof has different properties. When the roof is soft rock,the deformation amount is far more than that when the roof is hard rock or a combination of soft-hard rock. Under the same roof condition,the vertical displacement of the roof decreases with the increasing distance of the coal face. The study has provided a reference for the layout method on coal face and roof support pattern selection.

关 键 词：煤层顶板 岩性组合 采动效应 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]