综合管廊燃气爆炸对下穿隧道结构安全性的影响研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (8) : 160-166.

论文

王岱1,2，陈昌昊1，张海1,2，刘中宪1,2，孟思博1,2

作者信息 +

Influence of gas explosion in a utility tunnel on the structural safety of a undercrossing tunnel

WANG Dai1,2，CHEN Changhao1，ZHANG Hai1,2，LIU Zhongxian1,2，MENG Sibo1,2

Author information +

文章历史 +

摘要

针对综合管廊燃气爆炸时下穿隧道可能遭受的破坏风险，首先通过野外管廊燃气爆炸试验确定综合管廊超压时程，而后建立综合管廊-土体-下穿隧道整体三维有限元模型，并在综合管廊燃气舱内壁施加荷载，计算分析了下穿隧道的动力响应规律。结果表明，野外管廊燃气爆炸试验实测超压峰值高达0.63MPa，且升压和降压持续时间均为0.1s左右；隧道衬砌拱顶区域最先受到冲击，衬砌位移随时间增大而增大，而衬砌应力则在超压峰值时刻达到最大，且隧道平行下穿时的衬砌应力可达正交下穿时的3.5倍以上；随着隧道和管廊间距的增大，隧道动力响应如衬砌应力、振动速度等均逐渐减小，且隧道正交下穿管廊时的减小趋势更为明显；综合考虑各因素的影响，建议优先考虑隧道正交下穿综合管廊，且隧道与管廊的安全距离控制在7m以上。研究结果可为综合管廊抗爆及下穿隧道工程设计等提供参考。

Abstract

For the possible damage risk of the tunnel passing through the underground utility tunnel under the gas explosion, firstly, the overpressure time history of utility tunnel is determined through the field gas explosion test of underground utility tunnel, then the overall three-dimensional finite element model of utility tunnel, soil and undercrossing tunnel is established, and the load is applied to the inner wall of gas tank of utility tunnel to calculate and analyze the dynamic response law of undercrossing tunnel. The results show that the measured peak overpressure of gas explosion is as high as 0.63Mpa, and the duration of overpressure at both rising stage and descending stage is about 0.1s; The vault area of tunnel lining is impacted first, and the lining displacement increases with the increase of time, while the lining stress reaches the maximum at the peak of overpressure. The Mises stress of parallel undercrossing tunnel can be more than 3.5 times than that of orthogonal undercrossing; With the increase of the distance between the tunnel and the utility tunnel, the dynamic response of tunnel, such as lining stress and vibration speed, decreases gradually, and the decreasing trend is more obvious for the case of orthogonal undercrossing; Comprehensively considering the influence of various factors, it is suggested that the orthogonal undercrossing tunnel should be considered preferentially, and the safe spacing for the undercrossing tunnel should be greater than 7m. The research results can provide some reference for the anti-explosion design of utility tunnel and the engineering design of undercrossing tunnel.

导出引用

王岱1,2，陈昌昊1，张海1,2，刘中宪1,2，孟思博1,2. 综合管廊燃气爆炸对下穿隧道结构安全性的影响研究[J]. 振动与冲击, 2023, 42(8): 160-166

WANG Dai1,2，CHEN Changhao1，ZHANG Hai1,2，LIU Zhongxian1,2，MENG Sibo1,2. Influence of gas explosion in a utility tunnel on the structural safety of a undercrossing tunnel[J]. Journal of Vibration and Shock, 2023, 42(8): 160-166

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