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针对强冲击特厚煤层卸压措施难以选择的工程问题,通过理论研究与现场实测,对大直径卸压钻孔、煤层深孔卸压爆破、煤层注水3种卸压措施,进行了单卸压措施时效性对比实测。现场实测分析结果表明:大直径卸压钻孔卸压效果见效慢,但时效性较强,应作为常规的卸压措施;煤层深孔卸压爆破卸压效果见效快,但时效性较差,短时间内存在应力恢复现象,应作为临时解危措施;煤层注水卸压效果适中,同时具有较强的时效性,但存在应力转移和巷道大变形的情况,对于巷道断面较小的冲击地压工作面不应作为常规防冲措施,可以作为防尘措施实施。
Aiming at the engineering problems that are difficult to choose for the relief measures of strong impact thick coal seam, three kinds of pressure relief measures such as large diameter pressure-relief borehole, deep-hole pressure relief blasting in coal seam and coal seam water injection are carried out through theoretical research and field measurement. Timeliness of the measure comparison. The results of on-site analysis show that the pressure relief effect of large-diameter pressure-relief borehole is effective, but the timeliness is strong, so it should be used as a conventional pressure relief measure. The pressure relief effect of deep- The phenomenon of stress recovery in a short period of time should be taken as a temporary solution to the danger. The effect of water injection and pressure relief in the coal seam is moderate, with strong timeliness, but there is a case of stress transfer and large deformation of the roadway. Face should not be used as a conventional anti-shock measures can be implemented as a dust-proof measures.