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Study on the influence of surrounding rock parameters on the stability of tunnel face

The surrounding rock is the construction environment and main load source of the tunnel, and its physical parameters have an important influence on the stability of the tunnel face. Based on orthogonal test method, with the Georgia E60 highway 3.0.04 - TA tunnel under construction as the engineering background, numerical test method is used to compare and analyze the influence of different surrounding rock parameters ( elastic modulus E, cohesion C, internal friction Angle φ) on the stability of tunnel face. The multiple linear regression fitting equations of three factors and extrusion deformation are given and verified. The results showed that the elastic modulus and cohesion of surrounding rocks had a significant influence on extrusion deformation of the tunnel face, while the internal friction Angle had no significant influence. The extrusion deformation of the tunnel face is negatively correlated with the elastic modulus, cohesion and internal friction Angle of surrounding rocks. The fitting equation can provide a means for predicting the stability of surrounding rock and guide the construction of the tunnel.