Construction effect analysis of near tunnel based on the ground-equivalent circle zone-lining model

Based on the ground-equivalent circle zone-lining model, the construction effect of the near tunnel is calculated. The contact surface is established between the ground, equivalent circle zone and lining model, so the interaction between them can be analyzed. The different construction quality is simulated by the different thickness of the equivalent circle zone. The calculation show that the ground subsidence increases linearly when the construction quality drop and the coefficient of the new tunnel is 3.4 times of the near tunnel The plastic zone between the tunnels is larger than lateral outsides. The calculation shows that using the ground-equivalent circle zone-lining model, the interaction between them can be analyzed and the construction effect of the near tunnel can be worked out effectively.