2-126工作面覆岩移动及超前支承压力分布规律

Overburden Strata Movement and Distribution Law of Advanced Abutment Pressure in 2-126 Working Face

为掌握2-126工作面回采时覆岩移动规律和超前支承压力分布,通过具体分析工作面的地质条件,采用理论分析与数值模拟的方式进行上覆岩层运移规律的分析,确定基本顶的初次和周期来压步距,以及上覆岩层三带的分布;另外在回采期间通过现场监测的方式对工作面超前支承压力进行分析。结果表明:2-126工作面基本顶的初次和周期来压步距分别约为38.9 m和15 m,工作面垮落带和裂隙带的高度分别约为25 m和75 m,超前支承压力影响范围约为50 m,应力峰值约出现在超前工作面16.7 m的位置.

To grasp the movement law of overburden rock and the distribution of advanced abutment pressure in the mining of 2-126 working face,through specific analysis of the geological conditions of the working face,the theoretical analysis and numerical simulation are used to analyse the overburden rock layer migration law to determine the initial and sub-period pressure steps of the basic roof,and the distribution of the three zones of overlying strata,in addition,on-site monitoring of the support surface pressure during the mining process was also analysed in the paper.Results show that the initial and periodic stepping distances of the basic roof of the 2-126 working face are about 38.9 m and 15 m respectively,and the heights of the collapse and fissure zones on the working face are about 25 m and 75 m respectively.The influence range of the leading bearing pressure is about 50 m,and the peak stress appears at the position of 16.7 m ahead of the working face.