大型失控车辆与隧道衬砌的动态相互作用与损伤分析

基于动力有限元法模拟不同碰撞条件下隧道衬砌与大型车辆的动态相互作用,研究车辆与隧道结构在撞击作用下的动态响应。结果表明:在碰撞角度相同的情况下,隧道衬砌拉伸损伤值随车速的增大而增大;在失控车速相同的条件下,拉伸损伤值随碰撞角度的增大而增大;碰撞速度与角度越大,则车内人员受到的加速度越大,损伤越严重。对我国京沪高速公路上的蟠龙隧道碰撞事故(2009年)进行了数值模拟,对比分析发现数值模拟结果与蟠龙隧道碰撞事故后衬砌的表观信息及超声波探测结果有很好的一致性,碰撞后损伤区域的混凝土渗透系数明显增大,表明碰撞后衬砌发生漏水的几率明显增大。

Dynamic interaction and damage analysis of large runaway vehicle and tunnel lining

Based on dynamic finite element method, the dynamic interaction under different crash conditions between the tunnel lining and large vehicle and the dynamic response of them were studied. The results showed that in the same collision angle, the tensile damage value of the tunnel lining increased with the vehicles speeding up, and with the collision angle increasing at the same velocity. In addition, the increasing of the velocity and the angle of crash produced higher acceleration to the passengers, which meant a worse damage. Numerical simulation was carried out for an accident occurred in the Panlong Tunnel on the Jingfu Expressway (2009), and the results of the simulation was highly consistent with the appearance of the tunnel lining after the accident and the ultrasonic test image. The permeability coefficient of the concrete in the damage areas increased apparently, which led to a higher probability of water leakage for the tunnel lining.