Chongqing Vocational Institute of Engineering
Sinohydro Bureau 10 Co. ,Ltd.
Xi’an University of Science and Technology
Shanxi Coal Transportation and Marketing Group Zuoquan Panchengling Coal Industry Co. Ltd.

针对因煤层开采易导致上覆岩层产生裂隙,贯通地下含水层引发矿井水灾的问题,以盘城岭煤业150105工作面为研究背景,采用理论公式、现场井下仰孔注水测漏法和钻孔电视成像探测法,以及FLAC3D和UDEC数值模拟综合分析导水裂隙带的高度和发育规律。理论计算导水裂隙带的最大高度为81.56m;通过井下仰孔注水测漏法监测3个钻孔的注水渗透量梯度临界值为12L/min,通过临界值判定导水裂隙带高度为78.56~79.99m;通过钻孔电视成像探测法观测钻孔内裂隙分布判定导水裂隙带高度为78.39~79.46m;利用FLAC3D和UDEC数值模拟,根据覆岩塑性区变化特征,当工作面推进至180m时,裂隙发生贯通,塑性区最大高度达到76.4m,并根据覆岩塑性区变化、垂直应力分布、垂直位移云图分析了导水裂隙带发育规律的3个阶段。对不同方法下的导水裂隙带高度进行了相互验证。

In response to the issue that coal mining can easily lead to the formation of fractures in the overburden,which can penetrate underground water - bearing layers and trigger mine water disasters. This study takes the working face of Panchengling Coal Industry as the research background. Theoretical formulas,underground upward hole water injection leakage detection method,borehole television imaging detection method,FLAC3D and UDEC numerical simulations were employed to comprehensively analyze the height and development patterns of the water-conducting fracture zone. The theoretical calculation results show that the maximum height of the water-conducting fracture zone is 81. 56 m. Underground upward hole water injection leakage detection method monitored the water injection permeability gradient of boreholes,with a critical value of L/ min,and determined the height range of the water-conducting fracture zone to be 78. 56 m to 79. 99 m. Borehole television imaging detection method observed the distribution of fractures inside the boreholes and determined the height range of the water-conducting fracture zone to be 78. 39 m to 79. 46 m. FLAC3D and UDEC numerical simulations results indicate, Mining Safety & Environmental based on the characteristics of the plastic zone changes in the overlying rock,when the working face advances to m,fractures occur and penetrate. The maximum height of the plastic zone reaches 76. 4 m. Development pattern of the water-conducting fracture zone can be divided into three stages according to the changes in the plastic zone of the overlying rock,the distribution of vertical stress,and the vertical displacement cloud diagram. The heights of the water-conducting fracture zone is obtained by different methods and have been mutually verified.

重庆市教委科学技术研究项目(KJZD-K202303406,KJQN202203401,KJQN202303420)

王毅,周余,张丁丁,等.综采工作面采动覆岩导水裂隙带发育高度综合研究[J].矿业安全与环保,2024,51(5):132-141.

WANG Yi,ZHOU Yu,ZHANG Dingding,et al. Comprehensive study on the development height of water-conducting fracture zone in overburden rock of fully mechanized mining face[J]. Mining Safety & Environmental Protection,2024,51(5):132-141.