INSTABILITY MECHANISM AND REMEDIATION TECHNOLOGY OF TUNNEL CROSSING LANDSLIDE MASS
Cracks and deformations in the local tunnel are often caused by the tunnel crossing the large bias pres-sure and potential landslide mass.Taking the large-section tunnel of Hanshankou of Shaoxin Expressway as the en-gineering background,the tunnel entrance and landslide are studied through on-site investigation and monitoring and measurement.According to the deformation of the tunnel,the inducing factors and formation mechanism of the landslide at the tunnel entrance are analyzed,and effective treatment measures and monitoring techniques are pro-posed.The results show that the tunnel has a large extrusion deformation when passing through the potential land-slide(the maximum deformation is 44.4 cm,the maximum deformation rate is 30 mm/d);the landslide at the en-trance of the tunnel is caused by the combined factors of bias terrain,unfavorable engineering geology,construction disturbance,rainfall and so on.The deformation of tunnel and landslide is effectively controlled by adopting tempo-rary emergency measures such as crack sealing,hole body strengthening,and slope foot reinforcement,as well as comprehensive treatment measures such as prestressed anchor cable frame beam,hole grouting and ultra-small pipe support.The research results may provide reference and reference for similar projects.
instability of landslide partylarge section tunneladvanced small pipe