Construction Technology of High Geostress Fault Fracture Zone Tunnel
Taking Qianzhuwei Tunnel as an example,the deformation characteristics and failure factors of tunnel surrounding rock are studied through on-site investigation and calculation analysis.The control measures of surrounding rock are put forward,such as adopting double-layer small pipe advance support,setting long and short system anchor bars and double-layer steel arch and reasonably increasing the reserved deformation.The research results show that high geostress,weak surrounding rock,groundwater leakage and low support strength lead to large deformation and failure during tunnel construction.After adopting various surrounding rock control measures,the maximum values of vault settlement and haunch convergence of surrounding rock are 225mm and 168mm respectively,and the deformation is effectively controlled.
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