基于角位移临界值的顶板裂隙带高度研究

Study of water-flow fractur-zone height based on the critical value of rock angular displacement

顶板导水裂隙带是煤层顶板水进入工作面的重要通道.根据工作面采空区的空间形态和超限应力、有限空间的特点,采用岩层角位移临界值为判据,得出了导水裂隙带高度计算公式,并且将理论计算值与任楼煤矿实测数据进行了对比,验证了该公式正确可靠.通过该公式分析表明:采高与导水裂隙带高度的线性相关、碎胀系数、角位移值临界值越小,导水裂隙带高度越大,其中采高和碎胀系数权重较大.

The fractured zone through which water flows is one of the important passages where roof crevice water enters the working face. The spatial pattern of the goaf and the characteristic overstress and limited space were used to formulate a criterion for deducing the height of this water-flow fractured zone. The criterion was based on the critical value of rock angular dis- placement. The formula is correct and reliable compared to measured data obtained from the Renlou coal mine. The formula shows that the height of the water-flow fractured zone is linear- ly related to the mining height, the coefficient of bulk, and the critical value of rock angular displacement. As these decrease the height of the water-flow fractured zone increases. The mining height and coefficient of bulk have more influence on the height of the fractured zone through which water flows.