大直径钻孔采空区瓦斯治理技术研究

Study on gas control technology of large diameter borehole

为有效解决瓦斯尾巷取消后工作面采空区瓦斯和上隅角瓦斯超限问题,同时减少联络巷的施工,提出利用大直径钻孔抽采采空区瓦斯的技术。对钻机设备及配套施工工艺流程和参数进行了选择和设计,现场应用后,瓦斯抽放效果表明,随着工作面推进,大直径钻孔可有效改变采空区瓦斯流场,使工作面上隅角瓦斯浓度基本维持在0.25%~0.60%,大直径钻孔瓦斯治理工艺简单、施工速度快,成本低,极大缓解了煤矿采掘接替紧张问题,可以有效解决上隅角和采空区超限问题,提高瓦斯抽放效率。

In order to effectively solve the problem of gas overrun in the goaf and upper corner of the working face after the cancellation of the gas tail lane,and reduce the construction of the connecting lanes,a technology of using large diameter boreholes to mine the goaf was proposed.The rig equipment and supporting construction process flow and parameters were selected and designed.After field application,the gas drainage effect showed that as the working surface advanced,large-diameter drilling can effectively change the gas flow field in the goaf and make the working surface The corner gas concentration was basically maintained in the range of 0.25%~0.60%.The large diameter borehole gas treatment process was simple,the construction speed was fast,and the cost was low,which greatly eased the tension problem of coal mine mining replacement,and can effectively solve gas overrun problem in the upper corner and goaf,improve gas drainage efficiency.