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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
（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）
Measurement and Analysis of Dust Concentration in Service Tunnel during Construction of Tianshan Shengli Tunnel with "TBM Method + Drill and Blast Method"
(1. CCCC Central South Engineering Co. Ltd., Changsha 410000；2. School of Highway, Chang'an University，Xi'an 710064)
Abstract：
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 distribution 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 patterns 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 PM2.5, PM10, and PM100 concentrations maintained at 0.8 mg/m3, 3.7 mg/m3, and 9.5mg/m3, respectively, meeting the dust concentration thresholds for tunnel construction. During blasting periods in the main tunnel, dust concentrations in the service tunnel increase sharply, peaking at 1.4 mg/m3 for PM2.5, 6.9 mg/m3 for PM10, and 21.3 mg/m3 for PM100. Except for PM2.5, concentrations of PM10 and PM100 exceed their allowable levels by 38% and 113%, respectively. And so the ventilation volume in the service tunnel should be increased to 128.5 m3/s.Before the main tunnel connects with the connection passage, airflow must be exhausted through the service tunnel,synchronously driving dust concentration changes in both the service tunnel and connection passage during main tunnel blasting. Once the main tunnel working face connects directly to the connection passage, the blasting in the main tunnel will significantly affect dust concentration in the connection passage but has a smaller impact on the service tunnel
HUANG Dengxia1 LUO Yanbin2 ZHAO Zhiqiang2 CHEN Jianxun2 LIU Weiwei2 FENG Rubing1 WU Teligen1
.Measurement and Analysis of Dust Concentration in Service Tunnel during Construction of Tianshan Shengli Tunnel with "TBM Method + Drill and Blast Method"[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(4): 77-85
2024, Vol. 61 