基于Hoek-Brown准则的薄基岩厚松散层覆岩变形破坏特征研究  

Study on deformation and failure characteristics of overlying strata with thick loose layers and thin bedrock based on Hoek-Brown criterion

作　　者：李全生[1,2] 徐祝贺 张勇 何文瑞[1] Li Quansheng;Xu Zhuhe;Zhang Yong;He Wenrui(School of Energy and Mining Engineering,China University of Mining and Technology,Beijing 100083,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 100011,China;School of Coal Engineering,Shanxi Datong University,Datong Shanxi 037003,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]煤炭开采水资源保护与利用国家重点实验室,北京100011 [3]山西大同大学煤炭工程学院,山西大同037003

出　　处：《矿业科学学报》2019年第5期417-424,共8页Journal of Mining Science and Technology

基　　金：国家重点研发计划(2016YFC0501100);煤炭开采水资源保护与利用国家重点实验室(GJNY-18-77)

摘　　要：基于Hoek-Brown准则,以实验数据为基础确定了乌兰木伦矿的岩体力学参数,并运用FLAC3D研究了煤层开采引起的覆岩破坏特征。结果表明:①在浅埋深条件下覆岩破坏直至地表,地表形成偏态下沉盆地,最大下沉值2.1 m,下沉系数0.6。②在开采区域四周边界一定范围内分别形成应力降低区和应力增高区,呈现“外紧内松”状态,在工作面煤壁前方垂直应力集中程度最高,应力集中系数为2.2,在工作面煤壁上方和开切眼上方均存在“压力拱”,但两者的跨度、拱脚区域大小及应力集中程度不同。③乌兰木伦矿12403工作面垮落带高度为18.9 m,导水裂隙带高度为62.5 m。The mechanics parameters of rock mass in Wulanmulun mine are determined on the basis of the experimental data measured in the laboratory and applied Hoek-Brown criterion in this paper.On this basis the failure characteristics of overlying strata caused by coal mining are studied through FLAC3D simulation software.The research results show that:①The overlying strata under shallow burial depth until surface has been destroyed,and the skewness subsidence basin is formed on the surface.The maximum subsidence is 2.1m,and the subsidence rate is 0.6.②The stress-relaxed area and the stress-increased area are formed in a certain range of the surrounding boundary of the mining area.The state presents“external tight internal loosing”.The degree of vertical stress concentration in front of coal wall is the highest,and the stress concentration factor is 2.2.There is a pressure arch separately above the coal wall and the open-off cut,but the span,the size of the arch foot and the degree of stress concentration are different.③The height of the caving zone is 18.9 m,and the height of water flowing fractured zone is 62.5 m of 12403 face in Wulanmulun coal mine.

关 键 词：HOEK-BROWN准则 力学参数 浅埋深 数值模拟 覆岩破坏 

分 类 号：TD325[矿业工程—矿井建设]