厚煤层强采动覆岩卸压瓦斯富集特征精准探测技术
Precise detection technology for gas enrichment characteristics of overburden rock under pressure of strong mining in thick coal seam
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摘要: 为了更加直观和科学性研究分析厚煤层强采动覆岩裂隙发育规律和高浓卸压瓦斯在采动覆岩裂隙场富集特征，以玉华煤矿2407工作面为试验对象，依据经典的采动覆岩裂隙场理论及卸压瓦斯运移机理，采用多功能的智能钻孔探测的方法，在现场对玉华煤矿厚煤层强采动覆岩卸压瓦斯富集区进行精准探测。结果表明：采动裂隙区裂隙演化形态以岩层横向离层裂隙演化为主；随推进，岩层之间发生竖向破断贯通横向离层裂隙，形成纵横交错的裂隙网。该技术优化拓展了厚煤层强采动裂隙场中卸压瓦斯富集规律分析方法，可以指导高位走向大直径钻孔抽采卸压瓦斯富集区瓦斯工程实践。Abstract: In order to more intuitively and scientifically study and analyze the development law of overlying strata fractures in thick coal seam under strong mining and the enrichment characteristics of high-concentration pressure relief gas in the overlying strata fracture field, this paper takes 2407 working face of Yuhua Coal Mine as the experimental object. Based on the classical theory of overlying strata fracture field and the migration mechanism of pressure relief gas, the multi-functional intelligent drilling detection method is used to accurately detect the enriched area of pressure relief gas in overlying strata under strong mining in thick coal seam of Yuhua Coal Mine. The results show that the fracture evolution pattern of mining-induced fracture area is mainly the lateral separation fracture evolution of rock strata. With the advancing, vertical fracture and transverse separation cracks occur between rock strata, forming a crisscross fracture network. The technology optimizes and expands the analysis method of pressure relief gas enrichment law in the fracture field with strong mining in thick coal seam, and guides engineering practice of gas drainage and extraction in pressure-relief gas-rich areas by high-level large-diameter boreholes.
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