综采工作面顶板围岩应力特征相似模拟研究

为揭示采动影响下上覆岩层变化规律，以淮南矿业集团谢桥矿1232(1)综采工作面地质条件为工程背景，采用相似材料模拟实验和理论分析的方法，对综采工作面顶板围岩应力特征进行研究。相似模拟研究结果表明：随着采煤工作面的不断推进，工作面前方煤体内应力与超前支承压力峰值不断增大，当工作面由30 m推进至150 m，工作面顶板围岩各监测点处超前支承压力达到峰值时的最大应变量由14增大到292；工作面前方煤岩体经历了由原岩应力到应力升高再到应力降低的过程，其中80 m范围之外为原岩应力区，10~80 m为应力增高区，10 m范围内为应力降低区；随回采推进，各区逐渐向内部转移，对于地质变化不大的煤岩体而言，“三区”会逐渐扩大前移，但整体变化范围不大。研究结果可为中厚煤层的实际开采提供一定的理论指导。

Simulation study on stress characteristics of roof surrounding rock in fully mechanized working face

In order to reveal the variation law of overlying strata influenced by mining, taking the geological conditions of 1232(1) fully mechanized working face in Xieqiao Coal Mine of Huainan Mining Group as the engineering background, the stress characteristics of roof surrounding rock in fully mechanized working face were studied by means of similar material simulation experiment and theoretical analysis. The results of similarity simulation show that with the continuous progress of the coal mining face, the peak value of the internal stress and the advanced bearing pressure of coal mass in front of the working face increase continuously, and the maximum dependent variable of the advanced bearing pressure up to the peak vale at each monitoring point of the roof surrounding rock in the working face increases from 14 to 292 when the working face is pushed from 30 m to 150 m; the coal and rock mass in front of the working face has experienced the process from original rock stress to stress increase and then to stress decrease, in which the original rock stress area is beyond the range of 80 m, the stress increase area is between 10 m and 80 m, and the pressure decrease area is within the range of 10 m; with the advance of mining, each area gradually transfers to the interior, for the coal and rock mass with little geological change, the three areas will gradually expand and move forward, but the overall range of change is not large. The study can provide theoretical guidance for the actual mining of medium and thick coal seam.