Shanxi Zezhou Tiantai Energy Co., Ltd.

在煤层开采过程中,由于厚煤层开采技术水平要求高,开采条件复杂,因此研究厚煤层工作面矿压显现规律以及各方面的特征迫在眉睫。以山西某煤矿典型大采高工作面为工程背景,通过理论计算出工作面顶板各岩层载荷,再以此计算顶板周期垮落和初次垮落步距,计算得到的值可供现实实践参考。而后利用FLAC3D数值模拟分析了工作面矿压显现规律,得到结论如下,随着煤层的开采,顶板岩层在地应力作用下逐渐变形下沉,顶板中部下沉量最大,基本顶初次来压步距在60m左右。初次来压前,工作面前方应力峰值随开采距离增加而增大,影响区域也逐渐增大。当推进距离为50m时,影响范围约为35m;随着回采距离的增加,推进到60m时,应力峰值突然降低,应力峰值位置逐渐向煤壁前方更深处转移。此时支承压力峰值约为15.1MPa。

seam mining, it is urgent to study the behavior law of mine pressure and various characteristics of thick coal seam workingfaces. Taking a typical large height working face of a coal mine in Shanxi as the engineering background, the load of eachrock layer on the roof of the working face is theoretically calculated, and then the periodic collapse and initial collapse stepdistance of the roof are calculated. The calculated values can be used as a reference for practical practice. FLAC numericalsimulation was used to analyze the behavior of mine pressure on the working face, and the conclusion is as follows: with themining of coal seams, the roof rock layer gradually deforms and subsidence under the action of geo-stress, and the middlepart of the roof has the largest amount of subsidence. The basic roof’ s initial pressure step distance is at about 60 m. Beforethe initial pressure, the stress peak value in front of the working face increases with the mining distance, and the affected ar-ea also gradually increases. When the advancing distance is 50 m, the influential range is about 35 m. As the mining dis-tance increases, when advancing to 60 m, the stress peak suddenly decreases, and the stress peak position gradually shiftsdeeper in front of the coal wall. At this time, the peak abutment pressure is about 15. 1 MPa.