肥城煤田奥灰顶部注浆加固可行性分析

Feasibility analysis of grouting reinforcement of Ordovician top in Feicheng coalfield

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 that drainage for decreasing water pressure was useless to guarantee safe mining threatened by water inrush from Ordovician limestone in Feicheng coalfield, the feasibility study of grouting reinforcement of Ordovician top was carried out.Based on the statistics of exploratory boring data, coal mine drilling construction, X-ray diffraction of limestone samples, and microscopic thin sec-tion analysis, the macro and micro characteristics of Karst fissure in the Ordovician top of Feicheng coalfield were obtained.The result shows that the optimal depth for grouting reconstruction in Feicheng coalfield is about 20 meters below Ordovician top.Taking LW101002 in Caozhuang coal mine as test object, the grouting reinforcement project for Ordovician top was carried out.The conclusion validity is proved by the comparison of geophysical exploration and drilling before and after grouting.Practice proves that safety mining on the aquifer with high-pressure can be achieved by grouting reinforcement of Ordovician top.