|Table of Contents|

Optimization of ventilation scheme based on combination of press-in ventilation and jet fan in extra long tunnel(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:
101-112
Research Field:
隧道工程
Publishing date:

Info

Title:
Optimization of ventilation scheme based on combination of press-in ventilation and jet fan in extra long tunnel
Author(s):
CHEN Shuang-qin1;  ZHANG Long1;  REN Yu-peng1;  YANG Bao-ping1;  FENG Cheng-ming1; GAO Xin2;  GAO Qi-dong2
(1. The Engineering Co., Ltd of China Railway Beijing Engineering Group, Xi’an 710100, Shaanxi, China; 2. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China)
Keywords:
tunnel engineering;  ventilation and dust removal;  orthogonal test;  jet fan;  layout optimization;  extra long tunnel;  press-in ventilation
PACS:
U453.5
DOI:
10.19721/j.cnki.1671-8879.2023.01.011
Abstract:
In order to reduce the harm of dust generated during tunnel construction to the health of construction workers and the wear of construction machinery, based on the construction section DK052+415～DK054+500 of Xiangshan Tunnel of Zhonglan(Zhongwei-Lanzhou)Railway, the ventilation scheme of inclined shaft section during construction was optimized.The influence of the distance between the jet fan and the center line of the tunnel, the wind speed of the jet fan, the distance between the jet fan and the cloth hanging trolley, and the height of the jet fan on the dust removal effect of the tunnel were analyzed by using Fluent simulation. The influence of the distance between the fan and the cloth hanging trolley, the distance between the fan and the tunnel center line, and the fan wind speed on the dust removal effect was studied by using the orthogonal test method, and the layout scheme of the jet fan was compared and optimized. The results show that the dust concentration increases at the two vehicles in tunnel. The installation of jet fan auxiliary ventilation in the tunnel can reduce the dust concentration near the two vehicles.When the air duct and jet fan are arranged on the same side, the dust removal capacity of the fan will be reduced due to the friction between them. The wind speed of the fan has a positive impact on the dust removal capacity of the jet fan. The distance between the fan and the trolley and the height of the fan have optimal values, too large or too small will reduce the dust removal effect of the jet fan. The best layout scheme of jet fan is that the distance between the fan and the cloth trolley is 35 m, the distance between the fan and the tunnel center line is 2 m, the fan height is 2 m, and the fan wind speed is 40 m/s. Both range analysis method and variance analysis method show that the biggest influence factor of jet fan dust removal effect is fan speed. The order of influence importance of each factor on the dust concentration near the two vehicles is fan speed, fan distance from the cloth trolley and fan distance from the tunnel center line. During tunnel construction, the impact of fan speed on the dust removal effect of jet fan needs to be focused in the ventilation project of inclined shaft section.7 tabs, 16 figs, 33 refs.

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Last Update: 2023-01-30