近直立特厚煤层深孔爆破防治冲击地压效果检测

发布时间：2018-06-26 20:20

本文选题：冲击地压 + 近直立特厚煤层　；参考：《煤田地质与勘探》2017年04期

【摘要】：为了对近直立特厚煤层冲击地压进行防治,采用地面岩柱深孔爆破方法对煤层间岩柱进行预裂爆破,并采用地面EH-4探测法和井下瞬变电磁探测法对爆破前后岩柱体的物理力学结构进行探测,对卸压效果进行分析。EH-4探测表明,深孔爆破后岩柱结构破坏明显,在+550~+650 m水平范围时,岩柱体的电阻率等值线由近直立向近水平发育,视电阻率值主要集中在150~250?·m,明显高于未爆破区域;井下瞬变电磁探测表明,深孔爆破后岩柱裂隙增大,探测区域前方20~90 m,视电阻率值从爆破前的25~86?·m增加到爆破后的84~216?·m,出现高阻异常区域。深孔爆破后岩柱破碎效果较好,岩柱体内积聚的弹性能得到释放,卸压效果明显,有效降低了冲击地压发生的危险性。
[Abstract]:In order to prevent and control the rock burst pressure in the near vertical thick coal seam, the rock pillar pre-split blasting was carried out by using the deep hole blasting method of the surface rock column. The physical and mechanical structures of rock columns before and after blasting are detected by using the surface EH-4 detection method and the downhole transient electromagnetic detection method. The analysis of the pressure relief effect shows that the rock column structure is destroyed obviously after deep hole blasting. In the range of 550 ~ 650 m, the resistivity isoline of the rock column develops from near vertical to near horizontal, and the apparent resistivity is mainly concentrated at 150 ~ 250? m, which is obviously higher than that in the area without blasting, and the transient electromagnetic detection shows that the crack of rock column increases after deep hole blasting. The apparent resistivity increased from 25? 86? M before blasting to 84? 216? M after blasting. The area with high resistivity anomaly appeared. The fracture effect of rock column after deep hole blasting is better, the elastic energy accumulated in rock column can be released, and the pressure relief effect is obvious, which effectively reduces the risk of rock burst.
【作者单位】：辽宁工程技术大学矿业学院;中煤科工集团沈阳设计研究院有限公司;
【基金】：国家自然科学基金项目(51274117)~~
【分类号】：TD324.2

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