过沟开采速度对浅埋煤层覆岩移动变形的影响研究  

Influence of mining speed across trench on movement and deformation of overlying strata in shallow coal seams

作　　者：孙学阳[1,2] 李玲华 李成 苗霖田[3] SUN Xue-yang;LI Ling-hua;LI Cheng;MIAO Lin-tian(School of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Mine Geological Hazards Mechanism and Control,Xi’an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Xi’an 710054,China)

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]矿山地质灾害成灾机理与防控重点实验室,陕西西安710054 [3]煤炭资源勘查与综合利用重点实验室,陕西西安710054

出　　处：《煤炭工程》2022年第7期92-96,共5页Coal Engineering

基　　金：国家自然科学基金(41272388,51674195);矿山地质灾害成灾机理与防控重点实验室开放课题(KF2018-03)。

摘　　要：为了研究过沟开采速度对浅埋煤层覆岩移动变形的影响,以陕北府谷庙哈孤矿区安山井田为研究对象,采用Rhino^(3D)-FLAC^(3D)耦合技术建立过沟模型,分别以4m/d、6m/d和8m/d的推进速度进行数值模拟,探讨了不同开采速度对覆岩变形的影响。研究表明:当以4m/d的速度对煤层进行开挖时,导水裂隙带高度、地表下沉值和水平移动值分别为42.2m、1.67m和0.2m;以8m/d的速度对煤层进行开挖时,导水裂隙带高度、地表下沉值和水平移动值分别为32m、1.01m和0.14m,相对于以4m/d的速度开采,其导水裂隙带高度、地表下沉值和水平移动值分别减少了24%、40%和31%。随着开采速度增加,覆岩移动变形量有所减小,因此为了减少开采过程中覆岩的移动变形量,在煤矿生产过程中,可根据实际情况,适当增加煤层推进速度。In order to study the influence of mining speed across trench on the movement and deformation of the overlying strata in shallow coal seams,the Anshan mine field in the Miaohagou mining area in northern Shaanxi was taken as the research object,and the trench model was established using Rhino3D-FLAC3D coupling technology.The 6m/d and 8m/d advancing speeds are numerically simulated,and the influence of different mining speeds on the deformation of the overburden was discussed.Research shows that:when the coal seam is excavated at a speed of 4m/d,the height of the water-conducting fissure zone,the surface subsidence value and the horizontal movement value are 42.2m,1.67m and 0.2m,respectively;when the coal seam is excavated at a speed of 8m/d,the height of the water-conducting fissure zone,the ground subsidence value and the horizontal movement value are 32m,1.01m and 0.14m,respectively,which are reduced by 24%,40%and 31%,respectively,compared with mining at a speed of 4m/d.As the mining speed increases,the overburden movement and deformation decreases.Therefore,in order to reduce the movement and deformation of the overlying rock during the mining process,the coal seam advance speed can be appropriately increased according to the actual situation.

关 键 词：开采速度 过沟开采 覆岩破坏 数值模拟 浅埋煤层 

分 类 号：TD323[矿业工程—矿井建设]