孤岛综放工作面覆岩结构分析及矿压特征研究

The analysis of overburden rock structure and the study of ore pressure characteristics in the fully mechanized caving face of isolated island

为了保证采煤工作面的接替,避免回采巷道应力集中采区内会经常采用跳采的采煤方式,这便无法避免的使采区内存在一个工作面为孤岛工作面。本文通过分析孤岛工作面上覆岩层的结构特征得出老顶初次来压及周期来压步距的表达式,同时在3205孤岛综放面回采时进行矿压观测分析得出实际的老顶来压步距,同时得出工作面端头的来压强度高于工作面中部,对相似工作面回采时围岩控制提供参考。

In order to ensure the replacement of the working face and avoid the frequent use of stope mining method in the stress concentration mining area of the stope roadway,it is impossible to avoid the existence of an isolated working face in the mining area.In this paper,through the analysis of the structural characteristics of overburden strata on the isolated island,the expression of the first pressure and the periodic pressure step of the old roof is obtained.Meanwhile,the actual step step of the old roof is obtained through the observation of mine pressure during the mining in the fully-mechanized caving face of 3205 isolated island.At the same time,it is concluded that the compressive strength of the end of working face is higher than that of the middle of working face.