|Table of Contents|

Study on safety distance of pedestrian cross passages in single-tube four-lane highway tunnels(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年5期
Page:
81-91
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Study on safety distance of pedestrian cross passages in single-tube four-lane highway tunnels
Author(s):
QIAN Chao1;  ZHAO Yi-chen1;  SUN Mao-gui1;  CHEN Jian-xun2;  LUO Yan-bin2;  LI Zhuo3
(1. School of Electronic and Control Engineering, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China)
Keywords:
tunnel engineering;  pedestrian cross passage;  distance setting;  cross-sectional shape;  single-tube four-lane tunnel
PACS:
U45
DOI:
10.19721/j.cnki.1671-8879.2025.05.007
Abstract:
The safety distance of pedestrian cross passages in single-tube four-lane rectangular and arch-shaped highway tunnels was investigated. The differences in smoke concentration, temperature, carbon monoxide(CO)concentration, and visibility distribution were analyzed for a 50 MW fire in these two tunnel types. The impact of tunnel cross-section shape on the available safe escape time(ASET)was quantified, and a reasonable safety distance setting scheme for pedestrian cross passages was proposed. The results show that in rectangular cross-section tunnels, smoke concentration rises rapidly in a fire temperature and CO concentration significantly increase, while visibility declines quickly. In contrast, due to their structural characteristics, arch-shaped tunnels have a larger smoke storage space beyond the structural boundary, resulting in slower growth rates of smoke concentration, temperature, and CO concentration at the same horizontal height. Notably, visibility declines to the threshold for safe evacuation relatively slow, effectively extending the ASET and resulting in an overall superior evacuation environment. To ensure safe evacuation of personnel in the tunnel under fire conditions, the safety distance for pedestrian cross passages should be set in conjunction with tunnel cross-section shape. It is recommended that the safety distance in single-tube four-lane rectangular tunnels should not exceed 240 m, while in arch-shaped tunnels, it should not exceed 300 m. Currently, there are no provisions in relevant specifications for single-tube four-lane highway tunnel design. Research on pedestrian cross passages safety distances should consider tunnel cross-section shape, fire scale, and lane count, providing technical support for engineering design, disaster prevention, and rescue operation.6 tabs, 13 figs, 28 refs.

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Last Update: 2025-09-30