富水粉细砂隧道围岩加固技术研究

Study on Reinforcement Technology of Tunnel Surrounded by Water-rich Fine Siltstone Rock

粉细砂围岩受到开挖扰动或者遇水会成散砂、稀糊状,局部会出现涌水、涌砂现象。隧道在穿越这种地层时需要采取多种加固措施来保证施工的安全进行。新建玉溪至磨憨铁路中的太达村隧道穿越富水粉细砂地层的施工中,利用多种方式来确定掌子面前方的地质情况,采用掌子面帷幕注浆和地表深孔注浆对隧道围岩进行加固,并取得了良好的效果。本技术可为同类工程施工提供借鉴。

The siltstone rock will be disturbed by excavation or will become loose sand and mushy when exposed to water.Water gushing and sand gushing will occur locally on the face of the tunnel.When the tunnel passes through this stratum,various reinforcement measures are required to ensure the safe construction.In the construction of the Taida Village tunnel in the newly-built Yuxi-Mohan railway passing through the water-rich fine sand formation,various methods were used to determine the geological situation in front of the tunnel face,and then the tunnel face curtain grouting and surface deep hole grouting were used to reinforce the surrounding rock of the tunnel and,achieving good results.