大采高综采工作面采场上覆岩层运移规律研究

Study on the Movement Law of Overlying Strata in Stope of Large Mining Height Fully-mechanized Face

针对大采高综采工作面上覆岩层运移规律的特殊性,以苏家沟煤矿4101工作面为研究背景,对工作面推进过程中顶板运移情况进行了理论分析以及现场实测研究。研究结果表明:4101工作面直接顶为2类中等稳定顶板,基本顶为来压不明显的Ⅰ级顶板,工作面采场围岩属于较好控制的采场围岩。顶板岩层大约在距工作面煤壁前10 m处开始移动,其移动速率缓慢增加,基本顶中的两个深基点移动的运移情况基本一致,在推过基点大约15 m后,顶板运移量急剧增加,达到最大位移量,深部基点与浅部基点位移量大致相等,工作面顶板并未出现离层现象。

In view of the particularity of the movement of overlying strata in the fully mechanized mining face, the 4101 working face of the Sujiagou coal mine was taken as the research background, and the theoretical analysis of the roof movement in the process of the work surface advancing was carried out and the field survey was conducted. The results show that: 4101 face directly into a very stable 2 types of moderately stable roof, the basic top is not obvious pressure I level roof, working face surrounding rock is a better control of the surrounding rock. The rock strata began to move about 10 m away from the coal face of the working face. Its movement rate slowly increased. The movement of the two deep base points in the basic roof was basically the same. After about 15 m pushed through the base point, the roof moved. The volume increased sharply to reach the maximum displacement. The displacement of the deep base point and the shallow base point was approximately equal, and the top plate of the working face did not appear to be separated.