哈拉沟煤矿超长工作面矿压显现规律

Research on the Strata Behavior of Ultra Long Working Face in Halagou Coal Mine

工作面长度的加大在提高开采效率和资源采出率的同时,必将引起上覆岩层破坏及运移规律的改变,需要对超长工作面矿压显现规律进行研究以指导现场实践.以哈拉沟煤矿12上101工作面为背景,采用现场实测方法,对普通工作面与超长工作面下的初次来压、周期来压特征进行了测定分析,结果表明:老顶初次来压期间,超长工作面对应老顶垮落步距、来压期间支架循环末阻力及动载系数均大于普通工作面;周期来压期间,较普通工作面相比,工作面长度的增加使得来压步距将逐渐变小,当顶板来压时会支架循环末阻力、动载系数等一系列参数将逐渐增大,因此对于超长工作面周期来压时,压力强度相对比其它工作面显现明显.该研究为后续类似工作面的开采提供了一定程度的指导.

The increase of the working face length improves mining rate and efficiency, but causes the changes of overburden failure and migration patterns. The regularity of ground pressure under ultra long working face needs to be studied, so as to guide the practice. Take the mining condition of 12- 101 working face in Halagou Coal Mine as the background, this paper studies the characteristics of initial weighting and period weighting under conditions of ordinary working face and ultra long working face by using the field measurement method. Results show that failure step, support resistance and dynamic load coefficient of the ultra long working face are larger than those of the ordinary working face in the initial weighting of the main roof ; failure step of the ultra long working face is less than ordinary working face, the support resistance, dynamic load coefficient, and weighting duration of the ultra long working face are larger than those of the ordinary working face in the period weighting of the main roof, which means the working face periodic weighting strength relatively large. It provides guidance for subsequent similar mining conditions.