下保护层开采扰动卸压效应及瓦斯与煤自燃协同治理技术

Pressure relief effect of mining disturbance in the lower protective layer and collaborative control technology of gas and coal spontaneous combustion

为提高深部高瓦斯易自燃煤层灾害治理水平,探索合理的下保护层开采条件下瓦斯与煤自燃协同治理方法,以平煤十二矿己18煤层为研究对象,分析开采扰动被保护层的移动破坏特征,阐明扰动效应对被保护层煤岩体及瓦斯渗流产生的影响规律,制订相应的瓦斯治理与煤自燃防治协同技术。结果表明:在己18煤层开采扰动影响下,被保护层卸压效应显著,煤层沿垂直方向膨胀变形量大于0.300%,煤层透气性增大,突出危险性降低;矿井采用的穿层仰孔、顺层长钻孔、高抽巷穿层钻孔、采空区埋管等下保护层工作面立体全覆盖瓦斯抽采技术能够有效解决矿井瓦斯问题;同时配合通风管理优化、预测预报、隔离降温的综合防灭火技术,可以有效控制煤层自然发火危险性。

In order to improve the disaster control level of deep gassy coal seam prone to spontaneous combustion and explore a reasonable collaborative control method of gas and spontaneous combustion under the mining of the lower protective layer,taking the No.18 coal seam of No.12 Coal Mine of Pingdingshan Tianan Coal Co.,Ltd.as the research object,analyze the mobile failure characteristics of the mining disturbance protected layer,and clarify the influence law of the disturbance effect on the coal rock mass and gas seepage of the protected layer.The corresponding collaborative technology of gas control and coal spontaneous combustion control was formulated.The results show that the pressure relief effect of the protected layer is significant under the influence of the mining disturbance of No.18 coal seam.The expansion deformation of coal seam along the vertical direction is greater than 0.300%,and the permeability of coal seam increases and the outburst risk decreases.The three dimensional full coverage gas extraction technology of the working face under the protective layer can effectively solve the problem of gas in the mine,such as horizontal hole,bedding long drilling,high drainge roadway through the layer and buried pipe in goaf.At the same time,combined with ventilation management optimization,forecast,isolation and cooling integrated fire prevention technology,can effectively control the risk of coal seam spontaneous combustion.