综放面覆岩导水裂隙带高度的确定

为了确定长壁综放工作面覆岩导水裂隙带高度，以便为矿井开采提供设计依据，根据某矿长壁综放工作面开采技术条件和岩石力学性能等参数，建立力学模型，运用岩石破断过程分析软件RFPA^2D，对自开切眼至充分采动全过程覆岩随工作面推进时的变形、冒落情况进行了数值模拟，由此确定了覆岩导水裂隙带高度．用经验公式对覆岩导水裂隙带高度进行了计算，采用简易水文观测法对覆岩导水裂隙带高度进行了测定．结果表明数值模拟所得到的覆岩导水裂隙带高度与现场钻探结果比较接近，而由经验公式得到的结果偏于保守和安全，从而为确定覆岩导水裂隙带高度提供了一种新的、有效的方法．

Determination of the Height of Water Flowing Fractured Zone in Overburden Strata Above Fully-Mechanized Top-Coal Caving Face

In order to determine the height of water flowing fractured zone in overburden strata above fully-mechanized top-coal caving face,the mechanics model is established to provide the design basis for the coal mining according to the mechanical parameters of rocks and the exploitation technical conditions in a certain fully-mechanized top-coal caving face.By using the rock failure process analysis software(RFPA~(2D)),the deformation and falling of the overburden strata are simulated to determine the height of water flowing fractured zone in overburden strata as the coalface advanced.And the height of water flowing fractured zone in overburden strata is calculated by the empirical formula and is measured with a simple hydrological observation method according to drilling on spot.Compared with three results mentioned above,the numerical simulation result nearly the same as that on spot,and the result from the empirical formula is conservative and safe in practice.So it is efficient for numerical simulation to determine the height of water flowing fractured zone in overburden strata.