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厚硬顶板多关键层冲击地压与矿震协同防控研究

Exploratory research on the collaborative prevention and control of rock burst and mining seismicity in multi-key strata of thick and hard roofs

  • 摘要: 为了探索蒙陕深部矿区普遍面临的厚硬顶板多关键层条件下矿震和冲击地压的协同防控方法,本文主要开展了以下工作:分析了不同层位厚硬顶板对冲击地压和矿震的影响机制,表明低位顶板悬顶及破断产生的静-动载叠加易触发冲击地压,高位顶板大范围失稳释放强烈动载易诱发矿震,两者通过应力波联动加剧灾害风险;提出了基于顶板区域水力压裂的冲击地压和矿震协同防控思路;研发了“地质-能量-破裂-物性”多维度主控岩层判别技术,用于定位致灾层位;构建了冲击地压与矿震协同防控模式与方法,通过弱化低位顶板消除悬顶实现防冲,预裂高位岩层阻断大结构形成实现减震,从而达到冲击地压和矿震的协同防控目的。该技术在红庆河煤矿进行了试验性研究,试验工作面微震日均能量降低90%,周期来压步距缩短57%,日推进速度提升至5.6~6.4 m,初步验证了“低位连续卸压控冲击、高位分层弱化抑矿震”的协同防控效果,为蒙陕深部矿区冲击地压和矿震治理提供了一条新思路。

     

    Abstract: To explore the coordinated prevention and control methods for rockburst and mining-induced seismicity under the condition of "multiple key strata" in thick hard roof strata commonly encountered in deep mining areas of Inner Mongolia and Shaanxi, this paper mainly carried out the following work: The influence mechanisms of thick hard roof strata at different horizons on rockburst and mining-induced seismicity were analyzed, showing that the static-dynamic load superposition caused by the hanging and fracturing of lower-positioned roof strata tends to trigger rockburst, while large-scale instability of higher-positioned roof strata releasing intense dynamic loads tends to induce mining-induced seismicity, with both linked through stress waves exacerbating disaster risks; A coordinated prevention and control approach for rockburst and mining-induced seismicity based on regional hydraulic fracturing of roof strata was proposed; A multi-dimensional discrimination technique for dominant rock strata based on "geology-energy-fracture-physical properties" was developed to locate disaster-causing horizons; A coordinated prevention and control model and method for rockburst and mining-induced seismicity were established, which weakens lower-positioned roof strata to eliminate hanging roofs for rockburst prevention and pre-fractures higher-positioned rock strata to block large structural formation for seismicity reduction, thereby achieving coordinated prevention and control of rockburst and mining-induced seismicity. This technology was experimentally explored in Hongqinghe Coal Mine, where the test working face showed a 90% reduction in daily average microseismic energy, a 57% shortening of periodic weighting intervals, and an increase in daily advance speed to 5.6 m-6.4 m. The results preliminarily verified the coordinated prevention and control effect of "continuous pressure relief in lower strata to control rockburst and layered weakening in higher strata to suppress mining-induced seismicity," providing an approach for rockburst and mining-induced seismicity management in deep mining areas of Inner Mongolia and Shaanxi.

     

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