高徐军,周剑,张玉,吕佼佼,柳娜
GAO Xu-jun,ZHOU Jian,ZHANG Yu,LYU Jiao-jiao,LIU Na

• 1:中国电建集团西北勘测设计研究院有限公司

摘要(Abstract)：

为了解地下综合管廊的极限抗爆性能，基于LS-DYNA商用软件，建立了精细化数值计算模型，分析了内部燃气爆炸荷载作用下管廊结构的动力响应特征和受荷破坏全过程，揭示了其失效破坏机理。分析结果表明：当爆炸超压为80～140 kPa时，管廊结构墙缝、顶板跨中和边墙跨中位置出现裂缝；当爆炸超压为160 kPa时，边墙出现弯剪破坏；当超压达到180 kPa时，顶板在跨中位置明显破坏；当超压达到200 kPa后，结构发生倒塌破坏；基于超压峰值和结构破坏关系建立了管廊损伤预测方法，标定了管廊的损伤预测等级；提出了2种结构加固方法，将管廊结构抗爆性能提升了17.5%、146%,该加固方法为同类管廊提供了借鉴。
In order to understand the ultimate blast resistance performance of underground utility tunnel, a refined numerical calculation model was established based on LS-DYNA commercial software. The dynamic response characteristics and the whole process of loading failure of utility tunnel structure under internal gas explosion load were analyzed, and the failure mechanism was revealed. The analysis results show that when the explosion overpressure is 80-140 kPa, cracks appear in the wall joints of the pipe gallery structure, the of roof span and the middle of side wall span. When the explosion overpressure is 160 kPa, the side wall appears bending shear failure; when the overpressure reaches 180 kPa, the roof is obviously damaged in the mid-span position. When the overpressure reaches 200 kPa, the structure collapses. The damage prediction method of pipe gallery was established based on the relationship between overpressure peak and structural damage, and the damage prediction level of pipe gallery was calibrated. Two structural reinforcement methods are proposed, and the blast resistance performance of the pipe gallery structure is improved by 17.5 % and 146 %.

关键词(KeyWords)： 地下综合管廊;燃气爆炸;损伤预测;加固方法
underground utility tunnel;gas explosion;damage prediction;reinforcement method

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 高徐军,周剑,张玉,吕佼佼,柳娜
GAO Xu-jun,ZHOU Jian,ZHANG Yu,LYU Jiao-jiao,LIU Na

DOI: 10.19931/j.EB.20210409

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