【摘要】 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。更多还原

【Abstract】 "Mining above aquifer",as the main method to explore coal seams above confined aquifer,in which the determination of coal seam floor failure depth is the key factor and precondition.Taking the 1066 workface of Taoyuan Coal Mine for example,the high-precision microseismic monitoring technique is used to monitor the continuous and dynamic failure characteristics of an inclined coal seam floor above a confined aquifer,which can overcome the limitation of traditional method in field measurement of floor failure depth,especially for the failure depth of an inclined coal seam floor(the inclined angle of coal seam is between 25°and 45°).The monitoring results show that:(1) compared to the coal seam floor nearby the workface return airway(upper crossheading),the failure depth of coal seam floor nearby the workface conveyance roadway(lower crossheading) is deeper,with wider failure zone.(2) from the whole aspect,the failure zone of the inclined coal seam workface floor presents an asymmetric form.According to the results of microseismic monitoring,the maximum failure depth of the coal seam floor nearby the workface return airway and the workface conveyance roadway as well as the dangerous area of water-inrush from floor are determined.Finally,the floor failure depth determined by microseismic monitoring is compared with the failure depth calculated by the empirical formula;some existing deficiency of the empirical formula for calculating the floor failure depth are pointed out.更多还原