深部强矿压矿井煤层覆岩爆破卸压机理研究

    Mechanism of pressure relief by blasting in the overlying strata of deep coal mine

    • 摘要: 为实现深部矿井开采强矿压的高效治理,本文提出首先在煤层覆岩顶板布置“U”型巷道,然后对“U”型巷道中间的岩层进行集中爆破卸压的强矿压治理方案。以西北矿区某深部强矿压矿井为研究背景,在两种岩性的坚硬顶板中,各设计了两种不同埋深的“U”型巷道布置方案,分别是埋深−800 m、−825 m和埋深−850 m、−875 m。研究结果表明,采用“U”型巷道岩层爆破后,煤层采动过程中的采场应力、位移均有所减小。而“U”型巷道爆破卸压效果不仅与相对层间距有关,还与“U”型巷道所在岩层的岩性有关。在岩层岩性相同的情况下,“U”型巷道与下煤层的相对层间距越小,采场爆破卸压效果越好。

       

      Abstract: To effectively reduce the strong mining pressure in deep coal mine excavation, it is proposed in this study to drive a U-shaped roadway in the overlying strata of the coal seam, and effectively release the strong mine pressure through rock blasting. Based on the case of a deep coal mine located in the northwest, two different U-shaped roadway layout schemes are designed for hard rock, the burial depth is −800 m, −825 m and −850 m, −875 m, respectively. The results indicate that blasting in the U-shaped roadway significantly reduces stress and displacement in the working face during the coal mining process. It is shown that the effectiveness of the blasting for pressure relief in the U-shaped roadway is influenced by both relative layer spacing and mechanical behavior of the overlying strata. For the blasted rock strata with similar rock properties, a lower relative spacing between the U-shaped roadway and the coal seam can result in more effective pressure relief.

       

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