摘要
煤层开采引发的采动覆岩垮落带、导水裂隙带(“两带”)定量表征一直是采矿工程领域难解问题,精准刻画采动覆岩“两带”演变过程对于科学指导顶板水害防治与浅表水资源保护开采具有重要意义。采用三维电阻率反演技术,开展了长城六矿1301S工作面实测垮落带和导水裂缝带(“两带”)发育高度实测研究。结果表明:随着工作面逐渐向前推进,煤层上覆顶板局部岩层出现应力集中,岩层破断后视电阻率不断升高,随着工作面与钻孔之间距离缩短,高阻区距离孔口的距离也越来越近;1301S工作面3-1煤层开采后垮落带高度13.5 m,导水裂缝带发育高度达到45.9 m。通过矿方提供的资料分析,停采线附近的工作面回采厚度为3.36 m,则垮落/采厚比为4.02,裂缝/采厚比为13.66。项目研究成果可为相邻矿井及相似地层条件矿区保水开采设计提供决策依据,进一步完善保水开采理论与技术体系。
Quantifying overburden caving zone and water-conducting fracture zone(“two zones”)has been a challenge in mining engineering.An accurate depiction of the“two zones”evolution is important for scientific guiding water damage prevention and shallow surface water resources protection.In this study,we conducted an investigation on the caving zone and water-conducting fracture zone at the 1301S working face of the Great Wall Mine 6 by 3D resistivity inversion.The results show that,with the gradual advance of the working face,stress concentration occurs in the local rock strata of the overlying coal seam roof,and the apparent resistivity increases after the fracture rock strata;as the distance between the working face and the borehole shortens,the high resistance zone is getting closer to the borehole.While the height of the caving zone at the 1301S working face of the 3-1 coal seam is 13.5 m,the development height of the water-conducting fracture zone reaches 45.9 m.On the data analysis,the thickness of the working face near the stopping line is 3.36 m.The collapsing to mining thickness ratio is 4.02 and the fracture to mining thickness ratio is 13.66.The results can provide a basis for decision-making in the design of water protection mining in neighbouring mines and mines with similar strata conditions,and further improve the theory and technology of water protection mining.
作者
高超
秦胜君
安守学
牛淑敏
GAO Chao;QIN Shengjun;AN Shouxue;NIU Shumin(Beijing Tanchuang Resources Technology Co.,Ltd.,Beijing 110000,China)
出处
《山西煤炭》
2023年第1期109-118,共10页
Shanxi Coal
关键词
覆岩运移
电阻率反演
垮落带
导水裂隙带
保水开采
overlying strata migration
resistivity inversion
caving zone
water-conducting fracture zone
water protection mining
