This paper was intended to investigate the influence of zonal multiple blasting of the subsequently excavated tunnel on its surrounding rock and the antecedently excavated tunnel when a twin-tube eight-lane tunnel with a large cross section was excavated by the double sidewall heading method. To this end

the study took Niuzhaishan Tunnel

a twin-tube eight-lane road tunnel with a small clear distance in Pingtan Comprehensive Pilot Zone

as an example

established a twin-tube tunnel model in LS-DYNA

and carried out analysis based on field measurements of vibration velocity. The results were as follows: ① The maximum vibration velocity significantly attenuated as the distance between the blast center and the monitoring site increased. ② Among all the factors that influenced the structure of the antecedent tunnel during the explosion of the subsequent tunnel

the distance between the explosive source and the antecedent tunnel exerted the greatest influence

followed by charge quantity; the ratio of the maximum vibration velocity of the tunnel wall facing the blasting site to that of the tunnel wall facing away from the blasting site was 12.5; such ratio of the tunnel wall at waist height to the tunnel wall at the bottom was 2.1; by the same token

such ratio of the tunnel wall at shoulder height to the tunnel wall at the bottom was 1.9. ③ During the excavation process using the double sidewall heading method

Zone I made the most impact on the antecedent tunnel

due to its shorter distance to the antecedent tunnel and its fewest number of free faces. Thus

Zone I could be made the controlled case to monitor the blast-induced vibration that the antecedent tunnel underwent.