深部应力型突出灾害的声发射监测工艺及预警试验研究
Experimental Study on Acoustic Emission Monitoring Technique and Pre-warning of Stress Type Outburst Disasters in Deep Mine
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摘要: 为研究深部应力型突出灾害的声发射预警方法,采用底抽巷穿层布设传感器的新工艺,开展了深部矿井掘进面动力灾害的声发射监测工艺探索及预警试验。结果表明,穿层传感器适宜布置在底板中,且与煤层的距离宜控制在1~2 m,试验煤层传感器的有效监测距离为40 m。当掘进面处于高地应力区域时,声发射参数出现脉冲式增大;掘进面处于一般应力区域时,声发射参数处于较低水平。声发射参数与钻屑量的对比分析表明,声发射参数与钻屑量变化具有一致性,且超前于钻屑量指标。在传感器穿层布设新监测工艺条件下,声发射参数的变化可以反映工作面的煤岩瓦斯动力灾害地应力致因的变化。Abstract: In order to explore acoustic emission (AE) pre-warning method of stress type outburst disaster in deep mine, we carried out AE monitoring technique and pre-warning experiment for heading face dynamic disasters by installing transducers into through bed holes at bed plate tunnel. The results indicate that installing the transducer into the floor of coal seam is suitable for AE monitoring, and the suitable distance between the sensor and the coal seam should be within 1 m to 2 m; the effective monitoring distance of transducer is 40 m. When heading face is in a high stress area, the AE parameters increase with an impulse type; when the heading face is in a general stress area, the AE parameters are in lower level. Contrastive analysis of acoustic emission parameters and drilling cuttings shows that the variation of AE parameters are consistent with that of drilling cuttings at heading face, and ahead of drilling cuttings volume index. With the new monitoring technique of transducers installing into through bed holes, the variation of AE parameters can reflect the change of stress factors of coal gas dynamic disasters.
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Keywords:
- deep mine /
- stress type outburst /
- acoustic emission /
- monitoring technique /
- pre-warning
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