(1. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China)
Abstract：During the blasting excavation of deep-buried tunnels, the dynamic disturbance caused by the blasting load and the transient unloading is the key factor for the instability of the surrounding rock of the tunnel. This study takes a double-track tunnel in the western region as the background and uses the finite difference method to explore the spatial distribution characteristics of blasting vibration velocity on the tunnel contour surface, the superposition effect of ground stress and dynamic disturbance of blasting load, and the influence of stress adjustment under plastic deformation on blasting vibration velocity. The research results show that: (1) During blasting excavation, the blasting vibration velocity on the contour surface of the adjacent tunnel shows significant spatial differences. The peak particle vibration velocity (PPV) on the blast facing side is significantly greater than that on the back side. The PPV is the largest at the middle side wall on the blast facing side and the smallest at the arch top. (2) The initial in-situ stress level is positively correlated with PPV, and the vibration velocity induced by transient unloading under high in-situ stress increases significantly. (3) While using the elastoplastic constitutive model, the surrounding rock undergoes plastic deformation. After stress adjustment, the stress at the excavation face and the pilot tunnel is less than the initial ground stress. The spatial distribution characteristics of the blasting vibration velocity at key positions are consistent with the elastic constitutive model. The PPV changes with the ground stress in a different way. The increase in vibration velocity caused by transient unloading is lower than that of the elastic constitutive model.
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2026, Vol. 45 
