With the development of urbanization, the construction of the utility tunnel facilitates people's lives, but also brings some new potential hazards. For example, gas explosion occurring in the natural gas compartment can pose great threats to the safe operation of utility tunnels. In this paper, an experimental apparatus for modeling the process of the natural gas explosion in utility tunnels is established to investigate the effects of the gas compartment length and pressure relief conditions on the flame behaviors, and several parameters related to the consequence severity of gas explosion are studied comprehensively. The results indicate that ancillary facilities in the natural gas compartment (seen as obstacles) that cannot generate the large-scale recirculation zone but cause the small size of turbulence. The maximum overpressure firstly increases and then decays with the increase of the length of the gas compartment. Besides, it is also found that different pressure relief locations and strengths have a great influence on explosion characteristics in utility tunnels. This study can provide technical supports for safe management of utility tunnels. Meanwhile, some suggestions are put forward for the explosion suppression techniques and the design of pressure relief ports in the utility tunnel.

随着城市化的发展，综合管廊的建设在方便了人们生活的同时，也带来了一些新的潜在危害。例如，天然气舱内发生的瓦斯爆炸会对综合管廊的安全运行构成极大威胁。在本文中，建立了用于模拟综合管廊天然气爆炸过程的实验装置，以研究气室长度和泄压条件对火焰行为的影响，以及与瓦斯爆炸后果严重程度相关的几个参数进行了全面的研究。结果表明，天然气舱内的辅助设施（被视为障碍物）不能产生大规模的再循环区，但会引起小尺寸的湍流。最大超压随着气室长度的增加先增大后减小。此外，还发现不同的泄压位置和强度对综合管廊的爆炸特性有很大的影响。本研究可为综合管廊安全管理提供技术支持。同时，对综合管廊的抑爆技术和泄压口设计提出了一些建议。