煤层回采后覆岩破坏特征与煤层开采方法及覆岩性质相关，覆岩破坏特征主要指导水裂缝带发育高度及其形态，是顶板水害防治的关键技术参数。在分析矿井水文地质条件的基础上，采用钻孔冲洗液漏失量观测、数值模拟与经验公式3种方法综合确定了敏东一矿软弱覆岩综放开采条件下导水裂缝带发育高度，结果表明：综放开采厚度为7.7 m时，导水裂缝带发育高度为80 m。研究成果填补了我国北方大雁、扎赉诺尔、伊敏河等矿区的研究空白。通过对南一采区东西翼水文地质条件的对比分析，发现西翼水文地质条件较为复杂，提出以加强煤层顶板探放水与控制煤层开采厚度为主的防治水技术方法，并计算出工作面不同范围内的煤层开采厚度。%Overburden failure features after coal seam extraction are correlated to coal winning method and overburden properties. The features include mainly water conducted zone developed height and its configuration, thus the key parameters in roof water hazard con⁃trolling. On the basis of coalmine hydrogeological condition analysis, using borehole flushing fluid leakage observation, numerical simu⁃lation and empirical formula 3 methods comprehensively determined weak overburden water conducted zone developed height in the Mindong No.1 coalmine under fully mechanized caving condition. The result has shown that when the fully mechanized caving coal win⁃ning thickness is 7.7m, water conducted zone developed height is 80m. The research findings have bridged a studying gap in Dayan, Ja⁃lai Nur and Yiminhe mining areas in northern China. Through contrastive analysis of hydrogeological conditions in east and west limbs of S1 winning district has found that the hydrogeological condition in west limb is relatively complex, thus a water controlling technolo⁃gy of to mainly strengthen coal roof water exploring, drainage and control coal seam winning thickness put forward, estimated winning thickness in different limits in coal face.
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