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工作面采动影响下底板破坏深度微震规律

Identification of damage depth caused by longwall mining using microseismic technique

  • 摘要: 采用KJ959微震监测系统对朱庄煤矿III633工作面回采期间煤岩活动和导水裂隙带发育情况进行监测,分析了微震活动能量、时间分布、发育高度以及空间分布规律,结果表明:微震事件数量和能量与开采活动密切相关;回采期间微震事件以顶板事件为主;底板最大破坏深度为25~30 m,未波及到主要含水层,顶板裂隙发育高度为顶板上37 m范围内,裂采比约为13.2。研究结果可为后续采煤和进一步制定矿井防治水方案提供参考。

     

    Abstract: The KJ959 microseismic monitoring system was used to monitor microseismicity and the development of water-conducting fracture zones during the recovery of the III633 working face of Zhuzhuang Coal Mine. The energy,time distribution,development height,and spatial distribution patterns of microseismicity were analyzed. It is concluded that the number and energy of microseismic events are closely related to mining activities. Microseismic events during the recovery mainly occur on the roof of the longwall face. The maximum damage depth within the floor is about 25-30 m,which does not affect the main water-bearing layer. Fractued zoon developed up to 37 m into the roof. The fracture mining ratio is about 13.2. This study provides a reference basis for the subsequent recovery and further development of the mine water control program.

     

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