通风竖井对隧道内CO扩散速率的影响  

Influence of Ventilation Shaft on CO Diffusion Rate in Tunnel

作　　者：刘卫彬 孙三祥[1] 丁朝阳 陈霄汉 Liu Weibin;Sun Sanxiang;Ding Chaoyang;Chen Xiaohan(School of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,Shaanxi,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《绿色科技》2024年第8期153-159,共7页Journal of Green Science and Technology

基　　金：中铁第一勘察设计院集团有限公司项目(编号:WCSRSAUKY-2020-001)。

摘　　要：针对隧道内CO扩散速率的研究,试验选用物理隧道模型,通过传感器测量在开关不同数量、位置的竖井时隧道内CO浓度,计算分析CO在隧道内的扩散速率。根据试验结果可知,竖井的位置是影响CO的扩散速率关键因素,单竖井时,竖井位置于越靠近隧道中间区域,CO扩散速率越高,平均扩散速率0.1818 mg/(m^(3)·s),是不开竖井的5.81倍;双竖井时,竖井位置处于隧道进口与中段时,CO扩散速率最高,平均扩散速率0.3044 mg/(m^(3)·s),分别是其他2种工况的1.63倍和1.66倍;三竖井时,竖井分散处于隧道进出口与中段时,扩散速率最优,平均扩散速率0.406 mg/(m^(3)·s),是双竖井的1.33倍,单竖井的2.23倍。In order to study the diffusion rate of CO in the tunnel,the physical tunnel model is selected in the experiment.The CO concentration in the tunnel is measured by the sensor when the shafts with different numbers and positions are switched,and the diffusion rate of CO in the tunnel is calculated and analyzed.According to the test results,the position of the shaft is the key factor affecting the diffusion rate of CO.In the case of a single shaft,the closer the shaft is to the middle area of the tunnel,the higher the CO diffusion rate is.The average diffusion rate is 0.1818 mg/(m^(3)·s),which is 5.81 times that of the non-open shaft.In the case of double shafts,when the shaft is located at the entrance and middle of the tunnel,the CO diffusion rate is the highest,and the average diffusion rate is 0.3044 mg/(m^(3)·s),which is 1.63 times and 1.66 times that of the other two conditions,respectively.When the three shafts are dispersed in the tunnel entrance and exit and the middle section,the diffusion rate is the best.The average diffusion rate is 0.406 mg/(m^(3)·s),which is 1.33 times that of the double shaft and 2.23 times that of the single shaft.

关 键 词：隧道模型 竖井 CO 扩散速率 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]