论文部分内容阅读
以某矿9#煤层首采面为研究背景,建立了FLAC~(3D)力学模型,分别对不同的工作面长度和采高与煤层顶板导水断裂带发育高度的关系进行了研究。研究结果表明:不同采高情况下,工作面长度小于250 m的时候,导水断裂带高度都随工作面长度的增加呈线性增大关系,工作面长度在250~300 m之间时,导水断裂带高度增加迅速,当工作面长度达到300 m之后,导水断裂带高度的增加变缓,并都在工作面长度达到350 m的时候达到最大值,且随着工作面长度的增加不再变化;随着采高的增加,导水断裂带高度呈线性增大趋势。
Taking the first coal face of 9 # coal seam in a mine as the research background, the FLAC 3D mechanical model was established and the relationship between different working face length and mining height and the development height of the aqueduct of coal seam roof was studied respectively. The results show that under different mining conditions, when the working face length is less than 250 m, the height of the water-carrying fault zone increases linearly with the increase of working face length. When the working face length is between 250 and 300 m, The height of the water fault increases rapidly. When the length of the working face reaches 300 m, the increase of the height of the water-carrying fault zone slows down and reaches the maximum when the working face length reaches 350 m. With the increase of working face length, Then with the increase of mining height, the height of water-bearing fault zone increases linearly.