|Table of Contents|

Smoke diffusion characteristics and optimization of fire partition walls of underground tunnel with complex cross section(PDF)

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

Issue:
2023年1期
Page:
113-122
Research Field:
隧道工程
Publishing date:

Info

Title:
Smoke diffusion characteristics and optimization of fire partition walls of underground tunnel with complex cross section
Author(s):
LIU Chun1; 2;  ZENG Tian-sheng1;  GONG Guang-cai2;  FANG Xi2;  SHI Xing2; WANG Hong-shun2;  CHUN Liang2
(1. Guangdong Highway Construction Co., LTD, Guangzhou 510000, Guangdong, China; 2. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China)
Keywords:
tunnel engineering;  complex section;  covered underground tunnel space;  fire smoke;  ventilation;  disaster prevention;  fire partition wall
PACS:
U456.33
DOI:
10.19721/j.cnki.1671-8879.2023.01.012
Abstract:
To solve complex section cover type underground tunnel space ventilation problems setting up the fire partition, the underground was divided into single tunnel space, multiple composite space, space combination space of three and four combinations, through CFD simulation calculation under different tunnel space set fire partition scheme to diffusion regularity of fire smoke, combined with the simulation results reasonable fire partition optimization scheme was put forward, and implemented in actual projects. At the same time, the fire smoke diffusion law of the main bridge with and without fire partition wall was compared and analyzed. The results show that no partition wall is set in the space of the underground tunnel with complex cross section, which will cause the disorganized diffusion of smoke in multiple directions, and seriously affect the safety of people at higher position. Setting too many partitions will reduce the diffusion space of fire inside the tunnel, resulting in the rapid diffusion of smoke to the entire overpass tunnel space, thus reducing the escape time of personnel, resulting in safety hazards. The partition wall at the boundary of the main bridge can divide the tunnel into three relatively independent spaces, which can not only avoid the disorganized diffusion of smoke, but also ensure the tunnel has enough space and long enough escape time. The partition wall(four combined spaces)in the middle of the main bridge with two-way traffic is beneficial to strive for more escape time for personnel under fire condition, and then the scheme of setting fire partition wall on the main bridge is put forward. Therefore, the optimal scheme is to divide the whole underground tunnel space into four combined spaces, that is, two partition walls are respectively set at the junction between the ramp and the main bridge, and another partition wall is set in the middle of the main bridge. This study provides a reference for the design of space ventilation fire partition wall of underground tunnel with complex section, and guides the practical engineering application.2 tabs, 18 figs, 28 refs.

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Last Update: 2023-01-30