缙云山隧道穿越含瓦斯和采空区煤层施工技术研究

Study on the Construction Technology of Jinyunshan Tunnel Passing Through the Coal Seam with Gas and Goaf

针对隧道通过煤层中可能出现的瓦斯突出施工难点,采用排堵相结合方法,对瓦斯涌量超过警戒值,设计了通过富含瓦斯地层过程中瓦斯排放施工方案和参数,解决了缙云山隧道穿越煤层过程中瓦斯突出的施工问题;同时隧道开挖通过煤层采空区时,提出了隧道边墙两侧、拱部以上的采空区采用回填,仰拱以下采空区采用钻孔压住水泥砂浆充填处理,并给出了钻孔布置、压浆等工艺的施工参数,有效地解决了隧道通过富含瓦斯和采空区煤层施工难题,为类似工程提供经验。

According to the possible gas outburst occurred during the tunnel passing through the strata of coal,the discharging-blocking methods are used. If gas gushing quantity exceeds the warning value,the gas discharge is used and the construction scheme and parameters of gas drainage are designed. By the above methods,the gas seeping into the tunnel is effectively cut off,which the gas outburst problem is solved. When tunnel excavation passing through the empty zone,mined out areas around the both sides of the wall and arch of the tunnel are backfilled,and mined out area under the inverted arch is filled by the liquid cement through the drilled holes. Furthermore,construction parameters of the layout of drilled holes and grouting pressure are presented. Using the above construction scheme,the problem of the Jinyunshan Tunnel through the gas outburst and collapse of mining area is solved,which can offer experiences for the similar projects.