Abstract
Accidents and fires in tunnels hinder traffic and threaten the safety of personal and material resources, moreover, impact and temperature effects often cause damage to structures, affect structural performance, and shorten the service life of structures. In this article, the response behavior of the tunnel lining under the action of vehicle impact and fire load is simulated and analyzed. As the failure criterion of the lining dome settlement and the sidewall convergence displacement, the system compares the two interaction effect of the load, namely, the influence of the fire load on the impact resistance of the lining and the influence of the impact load on its fire resistance. The results show that the fire load reduces the impact resistance of the lining. Compared with the initial static load, the impact of temperature on the impact resistance is more significant; the impact load has an adverse effect on the fire resistance of the lining, when the tunnel lining is subject to explosion first. After the impact load working on the fire, the fire resistance of the lining will be significantly reduced with the increase of the static load ratio and the dynamic load ratio. The research can provide the reference for the design of fire protection and explosion protection parameters of tunnel support structures.
Highlights
Accidents and fires in tunnels hinder traffic and threaten the safety of personal and material resources, impact and temperature effects often cause damage to structures, affect structural performance, and shorten the service life of structures
Based on the stability problem of tunnel lining under extreme accidents such as explosion and fire, this article analyzes the structural response characteristics of tunnel lining under impact and fire load, and draws the following conclusions: 1. Under the combined effect of explosion and fire loads, considering the impact of concrete damage accumulation on the bearing capacity of the tunnel lining structure, one of the following conditions is considered to have reached the limit state of its load, and this is taken as its failure criterion: The top displacement exceeds 6 h/60; the side wall convergence reaches 6 L/30; when the damage is severely accumulated, the lining concrete cracks over a large area or the entire lining structure suddenly collapses
The P–I diagram is used to characterize the impact resistance of the tunnel lining when it is subjected to an impact load
Summary
Accidents and fires in tunnels hinder traffic and threaten the safety of personal and material resources, impact and temperature effects often cause damage to structures, affect structural performance, and shorten the service life of structures. The dynamic response of lining concrete structures under impact and fire loads is studied to determine the failure criterion of tunnel lining in two cases where the order of fire and impact loads is different.
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