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带压开采是承压水上采煤的主要方法,底板采动破坏深度的确定是实现带压开采的关键和前提。针对底板采动破坏深度现场测量方法的局限性,特别是倾斜煤层(煤层倾角在25°～45°之间)底板采动破坏深度的现场测量。以桃园煤矿1066工作面为例,利用高精度微震监测技术,对承压水上倾斜煤层底板的采动破坏特征进行了连续的、动态监测。监测结果表明:(1)工作面运输巷(下顺槽)附近的底板比工作面回风巷(上顺槽)附近的底板破坏深度更深,破坏范围更大;(2)倾斜煤层工作面底板破坏形态整体呈现为一个下大上小的非对称形态。根据微震监测结果,确定了1066工作面回风巷和运输巷附近底板的最大破坏深度,划分了倾斜煤层工作面底板突水危险区域。将微震监测的倾斜煤层底板破坏深度与经验公式计算的底板破坏深度进行了对比,指出了经验公式存在的不足。
Pressure mining is the main method of pressure water mining. The determination of mining depth of floor is the key and precondition to realize pressure mining. In view of the limitation of on-site measurement method of mining floor destruction depth, especially on-site measurement of floor mining failure depth in inclined coal seam (coal seam dip angle between 25 ° and 45 °). Taking the 1066 working face of Taoyuan Coal Mine as an example, the mining failure characteristics of the coal seam floor under pressure and water pressure are continuously and dynamically monitored by high-precision microseismic monitoring technology. The monitoring results show that: (1) The floor near the transport lane (under the cistern) is deeper than the floor near the return airway (the upper cistern) in the working face, and the scope of the damage is greater; (2) The floor of the inclined coal seam As a whole, the disruptive form appears as an asymmetrical form with large, small, large and small. According to the result of microseismic monitoring, the maximum failure depth of the floor near the air return tunnel and transportation lane of 1066 face is determined, and the danger zone of floor water inrush from the inclined coal seam working face is defined. The comparison between the failure depth of sloped coal seam floor under microseismic monitoring and the failure depth of the floor calculated by empirical formula shows that the empirical formula has some shortcomings.