薄煤层综采工作面围岩运动与矿压显现规律研究

Research on law of surrounding rock movement and rock pressure in full-mechanized mining face of thin coal seam

采煤工作面顶板岩石经过长期的沉积构造作用,岩石自身出现了多种多样的裂隙,煤炭采出后采空区由于矿山压力的显现作用,部分覆岩渐渐地发生变形、离层直至冒落。由于顶板冒落形成的空气冲击灾害与围岩运动及矿压显现规律有关,因此掌握二者规律是矿井安全、高效生产的关键因素之一。本文以某矿8214薄煤层工作面为研究背景,利用离散元软件UDEC对工作面采空区的初次来压步距、周期来压步距、裂隙发育情况进行研究。模拟结果真实地反应了工作面围岩运动规律及矿压显现规律,为同类矿井了解顶板冒落问题提供了参考依据。

After long-term sedimentary structure effect,the coal face roof rock itself appeares various fractures,owing to mine pressure appearence after mining the coal,parts of goaf overburden rock gradually become distortion,delamination even fall.Due to the collapse of roofs,formation of air disasters is related to the rock pressure and the surrounding rock movement law.Therefore,to master the law is a key factor of realizing mine safe and effictive production.This paper based on the background of one mine full-mechanized mining face in thin coal seam of 8214 and used UDEC to study working face of first weighting interval,cycle weighting interval and fracture development.By analyzing the simulation results,it reflected the law of rock pressure and the surrounding rock movement.The conclusion provided a reference for knowing the problem of mine roof collapse in similar mine.