煤层开采覆岩运动破坏相似材料模拟实验研究

为探究煤矿煤层开采过程中的覆岩运动破坏,以潘二煤矿11111、11113工作面的地质条件为基础,通过相似材料模拟实验的方法,建立工作面相似材料模型,将模型中11、13煤层采出;发现当开采推进距离未达到顶板极限跨距时,关键层上方的岩层基本无运动,当超过顶板极限跨距后,覆岩开始迅速变形垮落,采动结束后模型未能达到充分采动,产生的裂隙带形状近似拱形,弯曲带产生法向弯曲,但仍具有整体性;通过观测线下沉值可知,煤层采动所产生的空间由下向上传递时,下沉值及下沉空间逐渐减小。

In order to explore the damage caused by overburden strata movement in the process of coal seam mining,based on the geological conditions of working faces 11111 and 11113 in Pan'er Coal Mine,the similar material model of working face is established by the method of similar material simulation experiment.After No.11 and No.13 coal seams in the model are mined,it is found that when the mining advance distance does not reach the roof limit span,the rock strata above the key strata have little movement,and when the roof limit span is exceeded.The overburden began to deform and collapse rapidly,and the model failed to reach full mining after mining.The shape of the fracture zone was approximately arched,and the bending zone produced normal phase bending,but it still had integrity.Through the observation of the subsidence value of the line,it is known that when the space produced by coal seam mining is transferred from the bottomto the top,the subsidence value and subsidence space gradually decrease.