工作面不同采宽与导水裂隙带高度关系研究

Research on Relationship between Different Width of Working Faces and Heighst of Water-flowing Fractured Zone

为了研究水帘洞矿综放开采条件下,工作面不同采宽与导水裂隙带发育高度之间的关系,并确定工作面临界采宽,以便为矿井顶板水防治提供依据。根据该矿开采技术条件和岩石力学性质等参数,运用FLAC3D软件,模拟分析了工作面采宽从80～300m累计23个数值模型,进而确定出在不同采宽条件下导水裂隙带发育高度,并通过对水帘洞相邻矿井多个工作面实测和分析资料评价了数值模拟结果可靠性。研究结果表明当工作面宽度介于80～170m时,导水裂隙带发育高度随着工作面采宽的加大而呈分段线性增加;在工作面宽度为180m时,导水裂隙带发育至最大,此后导水裂隙带高度不再受采宽的影响。模拟得出现有地质条件下工作面的临界采宽为180m,导采比为19.2。从而为研究不同水文地质条件下采宽与导采比之间的关系提供了一种新的、有效的方法。

The text researched the relationship between different width of working faces and height of water - flowing fractured zone,and determined critical width of working face,in order to provide a basis of the roof water prevention and cure of mine,in condition of fully-mechanized top-coal caving in Shui Lian-dong mine. According to the working technique conditions and mechanical properties of rock,the text utilized FLAC3D to simulate 23 numerical models that the width of working faces are from 80m to 300m,and then determined the height of water-flowing fractured zone under different width of working faces,finally judged the reliability of the numerical simulation result by the observational data of multiple working faces in the several adjoining mines. While the width of working faces are between 80m and 170m,the height of water-flowing fractured zone increases by piecewise linearity as the width of working faces in- crease. While the width of working faces is 180m,the height of water-flowing fractured zone is largest unacted on the width of working faces. According to the numerical simulation,the critical width of working face is 180m and the ratio of height of water-flowing fractured zone and width of working face is 19. 2,under the specific geology conditions in the mine. The paper offered a new and effective method to reach the relation between width of working face and height of water-flowing fractured zone in different hydrogeology conditions.