井-孔联合微震技术在工作面监测中的应用
Application of well-hole combined micro-seismic technique in working face monitoring
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摘要: 为了利用微震监测技术准确预测煤层顶底板的异常变化情况，以河北葛泉东井矿11916工作面的开采过程为基础，采用井-孔联合微震监测技术，对11916工作面底板破坏深度和导水裂隙实时监测；利用放标定炮的方法，标定定位参数，验证定位精度，确保本次微震监测系统的定位精度能够满足要求，监测的工作面回采长度1 000 m。监测结果表明：在11916工作面回采过程中底板的破坏深度在底板以下20 m的范围内，顶板裂隙发育高度在顶板以上100 m的范围内，监测结果与矿方其他监测结果基本一致。研究结果表明井-孔联合微震技术可以监测到工作面底板破坏深度和顶板裂隙发育高度。Abstract: Based on the mining process of 11916 working face in east well of Gequan Mine, Hebei province, the failure depth of 11916 working face and water-conducting crack in floor were monitored in real time by using well-hole combined micro-seismic monitoring technology. The method of firing calibration gun was used to calibrate the positioning parameters and verify the positioning accuracy, so as to ensure that the positioning accuracy of the micro-seismic monitoring system could meet the requirements, and the stoping length of the working face was 1 000 m during the monitoring period. The monitoring results show that in the stoping process of 11916 working face, the damage depth of the floor is within 20 m below the floor, and the fracture height of the roof is within 100 m above the roof. The monitoring results are basically consistent with other monitoring results of the mine. The results show that the combined well-hole micro-seismic technology can detect the depth of floor failure and the height of roof crack development.
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