Study on Deformation Characteristics and Supporting Technology of Large-section Strongly Wet-submerged Loess Tunnel
Large-section strongly wet-submerged loess tunnel is prone to large deformation,failure of initial support and collapse during the construction process,and there are great difficulties and risks.This paper takes Lanshan Tunnel of Baolan Passenger Dedicated Line as the engineering background,through on-site investigation,researches and analyses the tunnel collapse condition and the reasons,and puts forward the curtain grouting,advanced support and filling mortar support technology.The research results show that the curtain grouting,advanced support and filling mortar support technology can effectively control the deformation of surrounding rock.After the support technology is adopted,the maximum values of tunnel settlement and hance convergence are 58.6mm and 25.4mm respectively.The stress of surrounding rock is basically stable.The maximum stress of steel arch is 53.7MPa,which does not reach the yield strength.It can be seen that the stress and deformation of tunnel surrounding rock meet the requirements,and the support technology is reasonable and effective.
NETL
NSTL
万方数据
