薄基岩厚松散层煤层覆岩导水断裂带发育高度研究

Study on the development height of the water conducted zone in coal seam overburden of thin bedrock and thick loose layer

为了研究薄基岩厚松散层条件下煤层覆岩导水断裂带高度发育情况,在山西三元煤矿3301工作面进行了工程试验,依据经验公式法对三元煤矿3301工作面3#煤层覆岩条件下的导水断裂带高度进行了理论预测,采用数值模拟的方法分析了3#煤层覆岩分布条件下采动导水断裂带高度的动态变化过程,并利用煤矿井下分段注水观测方法对3301工作面导水断裂带高度进行了现场试验观测。结果表明:采用上述3种方法得出的三元煤矿3301工作面导水断裂带高度分别为62.9、64.0、61.1 m,所得结果十分接近。为了确保安全,导水断裂带高度应取现场观测最大值64.4 m。

In order to study the height development of water conducted zone in coal seam overburden under the condition of thin bedrock and thick loose layer,engineering test was carried out in 3301 working face of Sanyuan Coal Mine,Shanxi Province.Based on the empirical formula method,the height of water conducted zone under overburden condition of No.3 coal seam in 3301 working face of Sanyuan Coal Mine was theoretically predicted.The method of numerical simulation was used to analyze the dynamic change process of the height of the subsidence water conducted zone under the distribution condition of No.3 coal seam overburden.The height of water conducted zone in 3301 working face was observed by field test using the method of staged water injection observation in underground coal mine.The results show that the height of water conducted zone in 3301 working face of Sanyuan Coal Mine obtained by the above three methods is 62.9 m,64.0 m and 61.1 m respectively,and the obtained results are very similar.In order to ensure safety,the height of the water conducted zone should be 64.4 m,which is the maximum value observed in site.