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An improved method for high‐efficiency coal mine methane drainage: Theoretical analysis and field verification

机译：一种高效的煤矿瓦斯抽采方法：理论分析与现场验证

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Degassing a coal seam with in‐seam boreholes is an important method for mitigating the gas hazards in the underground coal mine. However, the low strength of the outburst‐proven coal limits the borehole sealing performance and borehole space maintaining, and thus influences the drainage performance of in‐seam boreholes. This study was conducted to seek a method to improve the sealing performance and borehole space maintaining for high‐efficiency CMM drainage. A visco‐elastic plastic model involving the plastic softening and dilatancy features for soft coal was proposed, and the deformation, shrinkage, and fracture characteristics of the coal surrounded a borehole and a roadway were analyzed. An enormous amount of connective fractures generated in the failure zone and the plastic zone, and the plastic zone develops timely for the creep behavior of coal, which aggravates the difficulties of borehole sealing. A comprehensive approach including the theoretical method and the technical method was developed to determine the proper sealing depth which can significantly influence the sealing performance. The sieve tubes made of high‐density polyethylene has been used to maintain the borehole space during the scheduled pre‐drainage period. A series of field tests were conducted in an outburst‐proven coal seam to verify the feasibility of the comprehensive approach and the borehole space maintaining method. Field tests showed that the comprehensive approach to determine the proper sealing depth and the installing of sieve tubes to protect the borehole space can provide favorable conditions for maximum CMM pre‐drainage from outburst‐prone coal and maximum utilization of the in‐seam boreholes.
机译：用煤层钻孔对煤层进行除气是减轻地下煤矿瓦斯危害的重要方法。但是，经突出验证的煤的强度低，限制了井眼的密封性能和井眼空间的保持，从而影响了煤层内井眼的排水性能。进行这项研究以寻求一种方法来提高高效CMM排水的密封性能和保持井眼空间。建立了包含软煤塑性软化和膨胀特性的粘弹塑性模型，并分析了煤在井眼和巷道周围的变形，收缩和断裂特征。在破坏区和塑性区中产生大量的连接裂缝，塑性区适时地发展以适应煤的蠕变行为，这加剧了井眼密封的困难。开发了一种综合方法，包括理论方法和技术方法，以确定可以显着影响密封性能的适当密封深度。由高密度聚乙烯制成的筛管已用于在预定的预排水期内保持井眼空间。在经过突出验证的煤层中进行了一系列现场测试，以验证综合方法和井眼空间保持方法的可行性。现场测试表明，采用综合方法确定合适的密封深度并安装筛管以保护井眼空间，可以为从易爆煤中最大程度地抽采CMM和最大程度利用煤层内钻孔提供有利条件。

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