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针对肥城煤田不能够采用疏水降压的方法实现受奥灰突水威胁煤层安全开采的情况,开展了奥灰顶部注浆加固可行性试验研究。通过大量的钻孔资料统计、井下奥灰孔钻探工程、奥灰岩样X-衍射、显微镜下鉴定,获得了肥城煤田奥灰顶部岩溶裂隙宏观和微观发育特征,得出了肥城煤田奥灰顶部注浆改造的最佳深度是进入奥灰20 m的结论。以肥城曹庄煤矿101002工作面为试验对象,对该工作面奥灰顶部进行了注浆加固工程,通过注浆前后的物探及钻探勘查成果对比分析,验证了该结论的正确性。生产实践证明,通过注浆加固奥灰顶部岩层,能够实现高承压水体上煤层的安全开采。
In view of the fact that Feicheng Coalfield can not adopt the method of water drainage and pressure reduction to realize safe mining of coal seam threatened by Ordovician gray water inrush, a feasibility study on the grouting reinforcement of the top of Ordovician limestone is carried out. The macroscopic and microscopic characteristics of the karst fissures in the upper part of the Aohui coal field in Feicheng coalfield are obtained through a large amount of borehole statistics, borehole-arid gray-hole drilling project, limestone X-ray diffraction and microscopic identification. The best depth for grouting is the conclusion that the depth of the entry is 20 m. Taking the 101002 working face of Caozhuang Coal Mine in Feicheng as the test object, the grouting reinforcement project was carried out on the top of the worktop Aolitic gray. The correctness of the conclusion is verified by the comparison of geophysical and drilling exploration results before and after grouting. The production practice proves that the safe mining of coal seam on high confined water body can be realized by grouting to reinforce the top rock layer of Ordovician limestone.