Study on Overlying Rock Breaking Law and Development Height of Water-conducting Fissure in Stoping Face
张瑾 ZHANG Jin；段凯 DUAN Kai；马军伟 MA Jun-wei
（山西锦兴能源有限公司肖家洼煤矿，吕梁 331300）
（Shanxi Jinxing Energy Co.，Ltd. Xiaojiawa Coal Mine，Lvliang 331300，China）
摘要：煤矿开采伴随上覆岩层的离层垮落，会导通上覆含水层，影响工作面的安全生产。以某矿 1301 工作面为研究背景，采用关键层判别、薄板理论判别、有限差分数值模拟和现场注水实测手段开展回采工作面覆岩导水裂隙带发育高度研究。研究结果表明：关键层理论及薄板理论推理了上覆岩层的破断步距、关键层挠度及关键层下方自由空间高度，同时计算得出导水裂隙带的发育高度为54m；数值模拟分析了导水裂隙带发育过程中的应力传递规律并得出导水裂隙带高度为 56.5m；现场由巷道施工仰斜钻孔实测导水裂隙带发育高度为 54.4m。理论计算、数值模拟和现场实测结果相近，取现场实测数据为准，取 54.4m 作为最终结果。本文研究结果可为相似地质条件下煤矿顶板水防治提供参考。
Abstract: Coal mining accompanied by the collapse of overlying strata will lead to the overlying aquifer and affect the safe production of the working face. Taking the 1301 face of a mine as the research background, the development height of water-conducting fracture zone in overlying rock of mining face is studied by means of key layer discrimination, thin plate theoretical discrimination, finite difference numerical simulation and field waterflooding measurement. The results show that the fracture step of overlying rock, the deflection of key layer and the height of free space below the key layer are deduced by the key layer theory and thin plate theory, and the development height of the water-conducting fracture zone is 54m. The stress transfer law during the development of the water-conducting fracture zone is analyzed by numerical simulation and the height of the water-conducting fracture zone is 56.5m. The development height of the waterconducting fissure zone measured by the excavation borehole of roadway construction is 54.4m. The results of theoretical calculation, numerical simulation and field measurement are similar. Field measurement data shall prevail, and 54.4m shall be taken as the final result. The research results of this paper can provide reference for coal mine roof water control under similar geological conditions.
关键词：覆岩；导水裂隙带；经验公式；数值模拟；现场实测
Key words: overlying strata；water-conduction fracture zone；empirical formula；numerical simulation；field measurement
中图分类号：TD745 文献标识码：A 文章编号：1006-4311（2024）29-082-04 doi:10.3969/j.issn.1006-4311.2024.29.025
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