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为了确定巨厚煤层软弱覆岩分层综放开采条件下覆岩破坏特征,以老虎台矿55003工作面为对象,采用数值计算、微震监测和瞬变电磁探测方法对区域分层综放开采过程中覆岩破坏高度进行分析,确定了采出厚度与覆岩破坏高度的关系。研究表明,抚顺矿区巨厚煤层软弱覆岩条件下覆岩破坏高度与采出厚度呈线性正相关,覆岩破坏高度为采出厚度的8.4倍。巨厚煤层软弱覆岩的破坏高度比坚硬覆岩综放开采要小。覆岩破坏主要受到油页岩和绿色页岩组成的岩层结构的制约,同时受到F7-1断层和F7断层的影响。
In order to determine the characteristics of overlying strata failure under the condition of fully mechanized top-coal caving mining with thick overburden strata with thick overburden, taking the 55003 working face in Laohutai Mine as an example, numerical calculation, microseismic monitoring and transient electromagnetic detection The height of the overburden rock is analyzed, and the relationship between the thickness of the overburden and the height of the overburden rock is determined. The research shows that the height of overburden rock is linearly and positively correlated with the thickness of coal mining under the condition of soft overburden with thick seam in Fushun mining area, and the height of overburden is 8.4 times of the thickness of coal mining. The destructive height of the soft overburden in the thick seam is smaller than the fully mechanized caving mining in the overburden. The overburden failure is mainly controlled by the formation structure of oil shale and green shale, and is also affected by F7-1 fault and F7 fault.