Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting

Author:

Hu Hui1,Tao Yuchun1,Zhang Heng1,Zhao Yiqi1,Lan Youdi1,Ge Zhenghui1

Affiliation:

1. Southwest Jiaotong University

Abstract

Abstract In this paper, a 1:21 model experiment was conducted to discuss the dust dispersion efficiency and liner trolley obstruction effect inside the tunnel at -9° to 9°, the effect of different initial dust concentrations on dust dispersion and liner trolley obstruction effect at 6° slope, and the effect of different return air velocity on dust dispersion at 6° slope. The results show that as the slope of the tunnel changes from 0° to -9°, the average dust dispersion time decreases by 3.7% at the working face and the dust concentration difference between the front and rear of the trolley is improved by 2.7%. When the slope of the tunnel changes from 0° to -9°, the average dust dispersion time increases by 7.2% at the working face and the dust concentration difference between the front and rear of the trolley is improved by 17.9%. With each 100mg/m3 increase in the initial dust concentration, the dust dispersion time at the working face and the tunnel exit increases by 9.15% and 8.17% on average, and the lining trolley obstruction time increases by 23.33s on average. The dust dispersion times take an average reduction rate of 15.7%, with the increase of return air velocity. The recommended return air velocity is greater than 1m/s for large slope tunnels. When the slope changes from 0°to 9°, the hindrance rate of slope on dust dispersion is 2.88462%, 8.65385%, and 16.34615% respectively. Dust dispersion efficiency will be reduced as the tunnel slope changes from 0°to 9°, The growth rate of slope on dust dispersion is -0.96154%, -2.88462%, and -6.73077% respectively.

Publisher

Research Square Platform LLC

Reference33 articles.

1. The cooling effect of high geothermal tunnel construction environment: A case of ice and spray method in an extra-long tunnel;Zhang H;International Journal of Thermal Sciences,2022

2. 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;Tao Y;Journal of Building Engineering,2022

3. The relief degree of land surface in China and its correlation with population distribution;Feng Z;Acta Geographica Sinica,2007

4. Construction Technology for Large Slope Inclined Shaft by Three-step Slotting Method;Ma W;Railway Construction Technology,2018

5. Key Technology for construction ventilation in long and inclined shaft working area of single-line super long railway tunnel;Mao S;Building Technology Development,2019

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3