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针对偶然性爆炸对隧道的破坏问题,分析了某重要的软土中隧道在不同装药量和位置内爆炸情况下的动力反应和破坏机理;通过对比研究,分析了围岩等级对隧道抗内爆炸特性的影响;给出了隧道遭受内爆炸情况下围岩受到明显影响的范围。分析结果表明:当比例距离较小时,装药爆炸会对衬砌结构产生十分严重的局部破坏,在装药偏离隧道中心的内爆炸冲击波作用下,隧道结构产生整体运动和变形运动,既可引起结构的局部破坏,也可引起结构的整体变形破坏;围岩级别越高,限制隧道衬砌变形的能力越好,隧道的抗爆特性越好。本文可供隧道抗内爆炸能力评估和抗爆分析设计借鉴。
Aiming at the problem of accidental explosion damage to the tunnel, the dynamic response and failure mechanism of the tunnel in an important soft soil under different explosions and loadings are analyzed. By comparing the analysis results, The influence of the characteristics of the tunnel on the surrounding rock mass is also given. The analysis results show that when the proportional distance is small, the charge explosion will cause very serious local damage to the lining structure. Under the influence of the internal explosion shock wave with the charge deviating from the tunnel center, the tunnel structure will produce the whole movement and the deformation movement, Of the local damage can also cause the overall deformation of the structure damage; the higher the level of surrounding rock, tunnel lining deformation limit the better the ability of the tunnel antiknock the better. This article can be used for tunnel explosion resistance assessment and antiknock analysis design reference.