Test and Numerical Research of Explosion Inside Partially Confined Tunnel Structure
The propagation and attenuation effect of blast wave in a proposed partially confined tunnel structure are investigated.A three-dimensional finite element model of the partially confined tunnel structure is developed to simulate the propagation of blast wave in the partially confined tunnel and quantify the blast loading vented from the internal space to the adjacent free field.The mechanism of vortex forming,venting effect and blast wave attenuation characteristics are revealed based on the numerical predictions.The significant improvement effect of a composite configuration consisting of T-joints,venting channel,and expansion chambers on the wave attenuation efficiency is revealed by using numerical predictions and theoretical predictions based on scaling laws,the venting effect of the proposed tunnel structure is quantified.and the blast overpressure distribution in the adjacent free-field is obtained.This work can provide technical support for the structural optimization design of the partially confined tunnel.
partially confined tunnel structureblast wave release and attenuationblast wave propagationpressure distribution
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