回采巷道围岩分类治理模式及关键技术研究

以淮北矿区某矿回采巷道围岩治理中存在的问题为出发点，在摸清其围岩赋存特征、掌握支护失效原因的前提下，基于各主采煤层回采巷道围岩赋存差异等特征提出回采巷道围岩按煤层类别、沿空与否的分类治理模式，并进一步分析治理关键技术；通过数值模拟计算，对比分析两类回采巷道围岩分类治理前后巷道变形、应力变化情况，得到分类治理后巷道围岩变形大大减小，围岩应力亦明显改善；最后，将围岩分类治理的关键技术应用到工程实践。实践结果表明：回采巷道围岩分类治理后较分类治理前，围岩变形得到有效控制。研究成果能为类似条件下回采巷道围岩治理提供很好的借鉴和参考依据。

STUDY OF KEY TECHNOLOGIES AND MANAGEMENT MODES FOR CLASSIFYING SURROUNDING ROCKS OF GATEWAY

Based on the problems of the gateway of a mine of Huaibei mine area controlling surrounding rocks and different characters of tunnel surrounding rocks，management models and key technology were classified by coal seam types and whether driven along goaf or not that in premise of figuring out its feature and mastering failure reasons for supporting. Changes of deformations and stresses between before and after in two types of gateways is compared by numerical simulations during classification management. It was found that deformations of gateways surrounding rocks after classification management reduced greatly；and the stress levels of surrounding rock were significantly improved. Lastly，key technologies were applied to engineering practice. The practical result shows that deformations of gateways surrounding rocks were effectively controlled after classification management than those before classification management. The research results can be references for gateways surrounding rocks management under similar conditions.