天山胜利隧道“TBM法+钻爆法”施工期间服务隧道粉尘浓度测试与分析  

Measurement and Analysis of Dust Concentration in Service Tunnel during Construction of Tianshan Shengli Tunnel with"TBM Method+Drill and Blast Method"

作　　者：黄登侠 罗彦斌[2] 赵志强[2] 陈建勋[2] 刘伟伟[2] 冯如兵 吴特力根 HUANG Dengxia;LUO Yanbin;ZHAO Zhiqiang;CHEN Jianxun;LIU Weiwei;FENG Rubing;WU Teligen(CCCC Central South Engineering Co.Ltd.,Changsha 410000;School of Highway,Chang'an University,Xi'an 710064)

机构地区：[1]中交中南工程局有限公司,长沙410000 [2]长安大学公路学院,西安710064

出　　处：《现代隧道技术》2024年第4期77-85,共9页Modern Tunnelling Technology

基　　金：国家自然科学基金青年科学基金(52208385);中交一公局集团项目(X-GL-QSGS(J)-XIJ-WY-05-JS-80);新疆维吾尔自治区重大科技专项(2020A03003-5).

摘　　要：为探索高海拔超特长隧道在“TBM法+钻爆法”共同施工期间洞内气象条件和粉尘浓度时空分布规律,以乌尉高速公路天山胜利隧道为依托,通过现场监测分析洞内风速、风向、气压、温湿度等气象参数时变规律与粉尘浓度时空特性,对比分析不同工况(爆破期间与非爆破期间)下服务隧道和联络通道粉尘浓度分布特征,揭示多工作面条件下服务隧道内粉尘沿程分布规律,探索不同位置工作面爆破对服务隧道及联络通道粉尘浓度的影响。研究结果表明:服务隧道和联络通道内温度、气压、湿度及粉尘浓度的时变规律基本一致,但风速和风向受断面过风面积和施工影响有所不同,联络通道风速较服务隧道风速波动大,受右洞近距离爆破冲击影响,联络通道内风向短期会发生变化,由服务隧道向联络通道排风转变为向服务隧道送风。服务隧道内粉尘浓度从洞口向洞内呈三个梯度递增,竖井自然排风效应显著。主洞非爆破时段,服务隧道中粉尘浓度基本稳定,PM_(2.5)、PM_(10)、PM_(100)浓度分别维持在0.8 mg/m^(3)、3.7 mg/m^(3)、9.5 mg/m^(3)水平,均满足隧道施工粉尘浓度阈值;主洞爆破时段,服务隧道内粉尘浓度急剧增加,PM_(2.5)、PM_(10)、PM_(100)浓度达到峰值,分别高达1.4 mg/m^(3)、6.9 mg/m^(3)、21.3 mg/m^(3),该时段除PM_(2.5)浓度未超标外,PM_(10)、PM_(100)浓度均严重超过其容许浓度,超限比例分别为38%和113%,此时服务隧道应增大供风量为128.5 m^(3)/s。在主洞未与联络通道相连阶段,风流需经过服务隧道排出,主洞爆破会同步驱动服务隧道和联络通道内粉尘浓度变化;当主洞与联络通道直接连通时,主洞爆破会显著影响联络通道内粉尘浓度,但对服务隧道内粉尘浓度影响较小。To explore the spatiotemporal distribution patterns of meteorological parameters and dust concentrations in a high-altitude super-long tunnel during the construction combined with the"TBM method+drill and blast method",this study is based on the Tianshan Shengli Tunnel on the Urumqi-Yuli Highway.On-site monitoring was conducted to analyze the time-varying patterns of meteorological parameters such as wind speed,wind direction,air pressure,temperature,and humidity,as well as the spatiotemporal characteristics of dust concentration.The distri⁃bution characteristics of dust concentration in the service tunnel and the connection passage under different working conditions(blasting and non-blasting periods)were compared and analyzed.The study revealed the distribution pat⁃terns of dust along the service tunnel under multiple working face conditions and explored the impact of blasting at different working face locations on the dust concentration in the service tunnel and connection passage.The results indicate that the time-varying patterns of temperature,air pressure,humidity,and dust concentration in the service tunnel and connection passage are consistent,but the wind speed and wind direction vary due to differences in cross-sectional ventilation area and construction impact.The wind speed in the connection passage fluctuates more than in the service tunnel.Impacted by close-range blasting in the right tunnel,the wind direction in the connection passage temporarily reverses from exhausting air to the connection passage to supplying air to the service tunnel.Dust concentration in the service tunnel increases in three gradients from the portal to the inside,with a significant natural ventilation effect from the shaft.During non-blasting periods in the main tunnel,dust concentrations in the service tunnel are stable,with PM_(2.5),PM_(10),and PM_(100)concentrations maintained at 0.8 mg/m^(3),3.7 mg/m^(3),and 9.5 mg/m^(3),respectively,meeting the dust concentration thresholds for tunnel construction.During blasting pe

关 键 词：天山胜利隧道 服务隧道 粉尘浓度 气象参数 TBM法+钻爆法 

分 类 号：U455[建筑科学—桥梁与隧道工程]