Deformation Mechanism Research and Countermeasures for Soft Surrounding Rocks of Mountain Tunnel

The large deformation mechanism in the soft surrounding rock section of Caoyutan tunnel's left line is analyzed here in detail,which is in Leya Expressway from national expressway network.In the process of analysis,based on the geological conditions in sites and combined with detection measures,it is found out that the deformation is attributed to both geological conditions and construction quality defects.According to the deformation mechanism and combined with actual deformation conditions,the reasonable and effective solution is proposed to solve actual engineering problems.