高海拔特长山岭隧道施工通风技术

Construction Ventilation Technology of Extra-long Mountain Tunnel in High-altitude Area

高海拔特长山岭隧道由于其特殊的环境条件,空气稀薄、气候寒冷恶劣,给施工通风技术提出了更高要求。本文依托阿坝藏族羌族自治州九寨沟县勿角乡境内山岭隧道工程,通过理论研究与现场施工相结合的技术手段,对高海拔特长山岭隧道通风技术进行探讨分析,主要得出以下研究成果:(1)通过对高海拔地区隧道通风方式进行对比论证,确定采用独头压入式通风方式;(2)通过对高海拔山岭隧道施工各项通风参数进行分析计算,制定出高海拔山岭隧道通风专项技术方案;(3)通过在施工现场对隧道爆破施工后的粉尘与风速进行监测,验证了通风专项技术方案通风效果。

Due to the special environmental conditions such as thin air,cold and harsh climate in high-altitude area,higher requirements are put forward for the construction ventilation technology of extra-long mountain tunnels.Based on the mountain tunnel project located within Wujiao Town,Jiuzhaigou County,Tibetan Qiang Autonomous Prefecture of Ngawa,this paper discusses and analyzes the ventilation technology of extra-long mountain tunnel in high altitude area in combination with the theoretical research and field construction,and the following research findings are obtained:(1)by comparing and demonstrating tunnel ventilation mode in high altitude area,it is determined to adopt single-head compression ventilation mode.(2)Through the analysis and calculation of various ventilation parameters in the construction of high-altitude mountain tunnel,the special technical scheme for the ventilation of high-altitude mountain tunnel is formulated.(3)By monitoring the dust and wind speed of the tunnel after blasting at the construction site,the ventilation effect of the special technical scheme for ventilation is verified.