|Table of Contents|

Optimization of ventilation in construction section of inclined shafts in extra-long tunnels(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:
72-81
Research Field:
隧道工程
Publishing date:

Info

Title:
Optimization of ventilation in construction section of inclined shafts in extra-long tunnels
Author(s):
WANG Peng1;  PAN Hong-wei1;  CHENG Feng1;  JIA Run-zhi1;  GUI Shan1; REN Rui2;  LONG Wei2
(1. The No.1 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;  construction ventilation;  field test;  numerical simulation;  ventilation optimization
PACS:
U453.5
DOI:
10.19721/j.cnki.1671-8879.2023.01.008
Abstract:
In order to solve the problems of high dust concentration and poor working environment in the construction section of the inclined shaft of the extra-long tunnel, field tests were carried out in the construction section of the 5# inclined shaft of the Xiangshan Super-long Tunnel of the Zhonglan(Zhongwei-Lanzhou)Railway. The wind speed, wind flow direction, and dust concentration of each test section were collected to reflect the actual ventilation situation. A three-dimensional numerical model of press-in ventilation in the construction section of the inclined shaft was established to study the characteristics of the ventilation flow field in the tunnel and the law of dust diffusion. Combined with the numerical calculation of ventilation, the ventilation structure was optimized, and corresponding improvement measures were proposed. The results show that the air supply volume of the originally designed ventilation system is insufficient, and the wind speed of the tunnel body is low, only 0.1 to 0.2 m/s. There are a large number of vortex areas at the second lining trolley and at the intersection of the main hole and the inclined shaft. A large amount of dust generated by slag extraction and shotcrete operations is trapped in the main tunnel, and the dust accumulation phenomenon is obvious. During the slag removal operation, the dust concentration in the cave is the highest, the maximum values of the inhalable dust concentration, and the total dust concentration are 35.4 and 39.3 mg/m3, followed by the spray mixing operation. The maximum values of inhalation dust concentration and total dust concentration are 5.3 and 7.2 mg/m3. Under the three working conditions, the dust concentration in the cave exceeded the allowable value of the specification. The wind flow at the second lining trolley and the intersection of the inclined shaft and the main tunnel are chaotic, and there are a lot of eddy current areas, where dust particles gather and cannot be discharged out of the tunnel smoothly. In response to the above problems, measures such as adding air supply relay fans, jet guide fans, and dust-proof curtains are adopted to increase the air supply volume of the air duct, increase the return air speed in the tunnel, and guide the airflow out of the tunnel.3 tabs, 15 figs, 25 refs.

References:

[1] 《中国公路学报》编辑部.中国交通隧道工程学术研究综述·2022[J].中国公路学报,2022,35(4):1-40.
Editorial Department of China Journal of Highway and Transport.Review on China’s traffic tunnel engineering research:2022[J].China Journal of Highway and Transport,2022,35(4):1-40.
[2]王帅帅,毛锦波,张斌斌,等.乌尉高速天山胜利隧道总体施工技术方案[J].现代隧道技术,2022,59(1):55-68.
WANG Shuai-shuai,MAO Jin-bo,ZHANG Bin-bin,et al.General construction technology scheme of Tianshan Shengli Tunnel on Urumqi-Yuli Expressway[J].Modern Tunnelling Technology,2022,59(1):55-68.
[3]AKHTAR S,KUMRAL M,SASMITO A P.Correlating variability of the leakage characteristics with the hydraulic performance of an auxiliary ventilation system[J].Building and Environment,2017,121(47):200-214.
[4]SU F P,ZHOU X Q,WANG Y.Influence of atmospheric pressure fluctuation on air leakage rate of airtight-wall[J].Procedia Engineering,2011,11:401-408.
[5]ONDER M,CEVIK E.Statistical model for the volume rate reaching the end of ventilation duct[J].Tunnelling and Underground Space Technology,2008,23(2):179-184.
[6]赵宁雨,吕陈伏,陈弘杨,等.高海拔长大隧道压入式施工通风的合理长度研究[J].重庆交通大学学报(自然科学版),2020,39(3):94-99,128.
ZHAO Ning-yu,LU Chen-fu,CHEN Hong-yang,et al.Optimal length of forced ventilation in construction of long tunnel at high altitude[J].Journal of Chongqing Jiaotong University(Natural science),2020,39(3):94-99,128.
[7]TORANO J,TORNO S,MENENDEZ M,et al.Auxiliary ventilation in mining roadways driven with roadheaders:Validated CFD modelling of dust behaviour[J].Tunnelling and Underground Space Technology,2011,26(1):201-210.
[8]MARCHANT T,PORTER I.Modelling auxiliary ventilation systems for long tunnels[C]//Institution of Engineers.Proceedings of the Second Biennial Australian Engineering Mathematics Conference.Barton:Institution of Engineers,1996:73-78.
[9]HARGREAVES D M,LOWNDESO I S.The computational modeling of the ventilation flows within a rapid development drivage[J].Tunnelling and Underground Space Technology,2007,22(2):150-160.
[10]仇玉良,李宁军,谢永利.喷射混凝土衬砌隧道通风阻力系数测试研究[J].中国公路学报,2005,18(1):81-84.
QIU Yu-liang,LI Ning-jun,XIE Yong-li.Site test for ventilation resistance coefficient of shotcrete lining tunnel[J].China Journal of Highway and Transport,2005,18(1):81-84.
[11]谭信荣,陈寿根,周泽林.钻爆法施工隧道空气质量现场测试[J].地下空间与工程学报,2016,12(2):567-572.
TAN Xin-rong,CHEN Shou-gen,ZHOU Ze-lin.Air quality field testing in tunnel construction with the drilling and blasting method[J].Chinese Journal of Underground Space and Engineering,2016,12(2):567-572.
[12]王明年,邓 涛,于 丽.基于大断面高铁隧道的施工通风时间理论预测方法研究[J].隧道建设(中英文),2018,38(8):1279-1285.
WANG Ming-nian,DENG Tao,YU Li.Study of theoretical prediction method for construction ventilation time required for large-sectional high-speed railway tunnel[J].Tunnel Construction,2018,38(8):1279-1285.
[13]李 琦,于 丽,严 涛,等.高海拔隧道施工通风风管漏风率研究[J].铁道学报,2019,41(1):144-148.
LI Qi,YU Li,YAN Tao,et al.Study on construction ventilation duct leakage rate in high altitude tunnel[J].Journal of the China Railway Society,2019,41(1):144-148.
[14]骆 阳,王英学,宋相帅,等.曲线隧道施工通风沿程阻力损失数值模拟[J].地下空间与工程学报,2020,16(增2):897-903,933.
LUO Yang,WANG Ying-xue,SONG Xiang-shuai,et al.Numercial simulation of construction ventilation resistance loss along the curved tunnel[J].Chinese Journal of Underground Space and Engineering,2020,16(S2):897-903,933.
[15]XIE Z W,XIAO Y M.Application of thermal pressure ventilation technology in extra long construction tunnel with high ground temperature[J].IOP Conference Series:Earth and Environmental Science,2020,541(1):012011.
[16]雷 帅,方 勇,刘 静,等.南大梁高速公路华蓥山隧道施工通风优化研究[J].现代隧道技术,2019,56(02):194-200.
LEI Shuai,FANG Yong,LIU Jing,et al.Research of construction ventilation optimization for Huayingshan Tunnel on Nanchong-Dazhu-Liangping Expressway[J].Modern Tunnelling Technology,2019,56(2):194-200.
[17]赵树磊,王海洋,赵宁雨,等.米拉山隧道独头极限通风距离下污染物运移规律研究[J].隧道建设(中英文),2021,41(增2):367-374.
ZHAO Shu-lei,WANG Hai-yang,ZHAO Ning-yu,et al.Migration law of pollutants under dead-end limit ventilation distance of Milashan Tunnel[J].Tunnel Construction,2021,41(S2):367-374.
[18]张 欣,黄志军,周国宁,等.高寒高海拔隧道施工通风设施性能现场测试及优化[J].资源信息与工程,2019,34(2):151-153.
ZHANG Xin,HUANG Zhi-jun,ZHOU Guo-ning,et al.Field test and optimization of ventilation facility performance in high altitude tunnel construction[J].Resource Information and Engineering,2019,34(2):151-153.
[19]曹正卯,刘 晓,牛柏川.高海拔公路隧道施工期粉尘运移特性研究[J].地下空间与工程学报,2019,15(3):927-935.
CAO Zheng-mao,LIU Xiao,NIU Bai-chuan.Migration characteristics of dust during construction stage in highway tunnels at high altitude areas[J].Chinese Journal of Underground Space and Engineering,2019,15(3):927-935.
[20]ZHOU Y,YANG Y,BU R W,et al.Effect of press-in ventilation technology on pollutant transport in a railway tunnel under construction[J].Journal of Cleaner Production,2020,243:118590.
[21]XIE Z W,XIAO Y M,JIANG G X,et al.Numerical study on fine dust pollution characteristics under various ventilation time in metro tunnel after blasting[J].Building and Environment,2021,204:108111.
[22]TAO Y C,HU H,ZHANG H,et al.A new ventilation system for extra-long railway tunnel construction by using the air cabin relay:A case study on optimization of air cabin parameters length[J].Journal of Building Engineering,2022,45:103480.
[23]ZHOU G,FENG B,YIN W J,et al.Numerical simulations on airflow-dust diffusion rules with the use of coal cutter dust removal fans and related engineering applications in a fully-mechanized coal mining face[J].Powder Technology,2018,339:354-367.
[24]ZHANG G,YUAN S,ZHANG N N,et al.Dust-suppression and cooling effects of spray system installed between hydraulic supports in fully mechanized coal-mining face[J].Building and Environment,2021,204:108106.
[25]GBZ 2.2-2007,工作场所有害因素职业接触限值 第2部分:物理因素[S].
GBZ 2.2-2007,Occupational exposure limits for hazardous agents in the workplace -Part2:Physical agents[S].

Memo

Memo:
-
Last Update: 2023-01-30