浅埋富水卵石土地层隧道降水加固施工技术研究

Research on Construction Technology of Precipitation Reinforcement for Shallow Buried Water-Rich Pebble Soil Layer Tunnel

在高原山岭环境建设隧道,常遇到沟谷环境的浅埋隧道施工,由于降雨及山岭地下水流汇集冲刷,受水文地质条件影响,该类区域地层多以卵石土为主,且地层多富水,甚至出现地下暗涌复杂地层等不良施工环境。针对暗涌地层的流水治理,单纯注浆加固效果并不理想。本文针对浅理隧道地表加固及降排水技术进行研究,结果表明,采用咬合桩截水帷幕+井点降水+注浆加固+暗挖法施工工艺,可有效解决地下水发育问题,对地下流动暗涌水治理效果较好;验证试验结果表明,采用注浆工艺,对原地层围岩单轴抗压强度提升效果明显。

In the tunnel construction in the plateau mountain environment,shallow buried tunnel construction in the valley environment is often involved.Due to the accumulation and erosion of rainfall and mountain underground water flow,affected by hydrogeological conditions,the formation in this area is mainly pebble soil,and the formation is rich in water,and even resulting in underground gushing formation and other bad construction environment.The effect of simply grouting reinforcement is not ideal for the treatment of flowing water in underground gushing formation.In this paper,a study was conducted on the surface reinforcement and dewatering technology of shallow buried tunnels.The results show that the use of bite pile water cutoff curtain+well point dewatering+grouting reinforcement+underground excavation construction technology can effectively solve the problem of groundwater development and has active effect on treating underground surging water.The verification test results show that the grouting process has a significant effect on improving the uniaxial compressive strength of the surrounding rock in the original formation.