贾木那大桥水压定向爆破及其数值模拟

Directional water pressure blasting of Jamuna bridge and its numerical simulation

为了分析及研究薄壁空腔桥墩的水压爆破机理,以孟加拉国贾木那大桥水压定向爆破拆除工程为研究对象,采用显示动力学分析软件模拟了桥墩的水压爆破破碎过程,根据数值模拟结果,得出了水压爆破主要是利用爆炸冲击波、爆轰气体、反射拉伸波及高速水流对桥墩壁面进行破坏,在此基础上,探讨了桥墩水压定向爆破的药包布置方式、起爆顺序等技术问题。

In this study we investigated the mechanism of water pressure blasting in the thin-walled bridge pier, taking the water pressure directional blasting demolition project of Jamuna bridge as the research object and using the explicit dynamics analysis software to simulate the crushing process of the water pressure blasting in the bridge pier. The numerical simulation results show that the failure of the bridge pier mainly depends on the explosive shock wave, the detonation gas, the reflected tension wave and the high-speed flow. Based on these findings, we examined the technical problems of the arrangement of the explosive charge and the order of detonation in the directional water pressure blasting in the bridge pier.