大采高综采采空区条件下上行开采关键问题研究

Key problems of upward mining under the condition of fully mechanized goaf with large mining height

为了给大采高条件下上行开采提供依据,首先采用理论分析法,推导出大采高综采工作面"部分平衡结构形成层位"平衡结构形成层位"的判别公式。其次以此为标志层,将上部煤层分为3种类型:当上部煤层位于"部分平衡结构形成层位"以下,上部煤层受到较大破坏,不可上行开采;当上部煤层位于"部分平衡结构形成层位"以上、"平衡结构形成层位"以下,上部煤层在一定程度上受到破坏,当其台阶错动量满足要求时,可上行开采其部分厚度;当上部煤层位于"平衡结构形成层位"以上,上部煤层受到的破坏较小,可以上行开采。最后用实例进行了验证。结果表明,文中所提出的大采高综采采空区条件下的上行开采可行性判别方法具有一定的准确性。

In order to provide a basis for upward mining under the condition of large mining heights,firstly, through theoretical analysis, the discriminant formulas of "partially balanced structure formation horizon" and "equilibrium structure formation horizon" in fully mechanized mining face with large mining height was derived. Secondly, with balanced structure formation horizon and part balanced structure formation horizon as marker layers, the upper coal seams were divided into three types: when the upper coal seam is located below the balanced structure formation horizon, the upper coal seam suffers substantial damage, and the coal seam can be mined upward;when the upper coal seam is located below the equilibrium structure formation horizon and above the part balanced structure formation horizon, the upper coal seam suffers a certain amount of damage, and the coal seam can be mined upward when the step error satisfies the relation deduced;when the upper coal seam is located above the equilibrium structure formation horizon, the upper coal seam suffers relatively small damage and can be mined upward. The findings were verified through examples. The results have shown that the method of ascending mining feasibility judgment under the condition of large mining height fully mechanized goaf has certain accuracy.