(1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China；2. Architectural Engineering Institute, Hunan Communication Polytechnic, Changsha 410132, China)
Abstract: As a weak part of the assembled tunnel structure, the impact dynamic response characteristics of the joint was directly related to the stability and safety of the whole tunnel. To explore the dynamic response characteristics of three kinds of assembled tunnel joints (self-weight mortise-tenon joint, bolt mortise-tenon joint and steel plate mortise-tenon joint) under impact load, ABAQUS software was utilized to simulate the dynamic response process and damage characteristics of three kinds of joints under impact load, and the impact resistance of three kinds of joints was compared. The results indicated that the response of the assembled tunnel joint under impact could be divided into initial impact stage, development stage and stable stage. In this process, the joint was affected by impact force, reaction force and inertia force. The dynamic response characteristics of the three types of joints were influenced by the mass and velocity of the impact. When the impact mass exceeds 1,400 kg and the impact velocity exceeds 60 km/h, the central displacement, opening, and damage range of the joints significantly increased. The steel plate tenon and mortise joint was the structure with the best impact resistance among the three types of joints. In the anti-impact design of assembled tunnel structures, it was necessary to focus on enhancing the stiffness of the joints.
