Large Deformation Mechanism and Control Technology of Squeezing Surrounding Rock Tunnel
Large deformation of soft rock is always a difficult problem in tunnel construction.Improper handling will seriously affect the safety,construction period,quality and cost of the tunnel.Due to the lack of cases at home and abroad,and the lack of relevant experience,the large deformation of squeezing surrounding rock further increases the construction difficulty.This paper is based on Ganzhuang Tunnel of Yumo Railway.The mechanism of large deformation is determined by analyzing in-situ stress,geological structure and formation lithology.According to the mechanism of large deformation,the corresponding control technology is determined,including three-step variant short-step excavation technology,deformation control technology of pressed steel arch,high-speed advanced grouting technology of broken zone,deformation control technology of yielding filling layer,etc.Through a series of targeted measures,the deformation of surrounding rock is successfully controlled,and the construction efficiency is improved.It can provide reference for similar projects.
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