基于冻结法的地铁区间隧道矿山法暗挖施工

Underground Excavation Construction of Metro Tunnel Based on Ground Freezing Method

为了保证在地铁含水段隧道顺利进行矿山法暗挖施工,通过冻土墙强度理论计算,合理布置、施工冻结孔,采用冻结法加固土体,形成具有设计厚度及强度的封水挡土墙,封堵地下水源;在隧道开挖过程中,开挖面干燥无水,27 m含水段隧道开挖顺利施工完成,避免了隧道暗挖施工中涌砂涌水、地面环境及隧道遭到破坏的重大风险。

In order to ensure the water bearing metro tunnel successfully constructed with the mine underground excavation method, with the theoretical calculation of the freezing wall strength, rational layout and freezing borehole construction, a ground freezing method was applied to reinforce the soil ground to form a water sealing wall with designed thickness and strength to seal the underground water sources. During the tunnel excavation period, the tunnel excavation face was dry and with no water. Thus the 27 m water hearing tunnel was suc- cessfully constructed and completed, which eliminated the sand and water inrushing during the tunnel excavation and had no great risks to the surface ground and tunnel.