Study on CO distribution and diffusion in spiral construction tunnel on plateau

doi:10.16265/j.cnki.issn1003-3033.2022.12.0110

Abstract

Abstract:

In order to explore the air flow field distribution and CO migration characteristics in a spiral construction tunnel on the plateau and improve the ambient air quality of the excavation face in the construction tunnel, Ansys Fluent was used for fluid simulation based on fluid governing equations and component transport models. The characteristics of the airflow field and CO distribution under multiple working conditions were simulated by taking the air speed of supply wind and the distance between the excavation face and air duct as the influencing factors, and a multiple linear regression model was established for the calculation of CO mass concentration in the spiral construction tunnel on the plateau. The results show that the average wind speed of the cross-section first increases and then decreases in front of the air duct, and gradually becomes stable behind the air duct along the tunnel exit direction. When the distance between the excavation face and the air duct exceeds 30 m, the two regions of the jet end and the front of the air duct mouth are easy to form an obvious vortex. The CO concentration presents two distribution characteristics: "low in the middle, high on both sides" and "low on the left and high on the right, low on the top and high on the bottom" with the influence of wind speed and distance. The CO mass concentration at different times and sections in the tunnel can be calculated by multiple linear regression model.

Key words: plateau section, spiral construction tunnel, CO mass concentration, excavation face, airflow field

LIU Jie, ZHOU Haowen, WANG Wanqing, ZHANG Yue, ZHAO Huyun. Study on CO distribution and diffusion in spiral construction tunnel on plateau[J]. China Safety Science Journal, 2022, 32(12): 79-87.

Figures/Tables 12

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模型参数	设置
求解器	Pressure-Based
时间	Transient
空气密度/(kg·m^-3)	0.9
温度/℃	19.6
炮烟抛掷长度/m	62
CO初始质量浓度/(kg·m^-3)	0.003 1

编号	c_i	v_i	l_i	t_i
1	1 648	1.566	5	1
2	1 087	1.902	10	3
3	724.6	1.874	15	6
4	310	0.702	20	9
5	163.2	0.55	25	12
6	120	0.542	30	15
7	90	0.533	35	18
8	72	0.535	40	21
9	46	0.524	45	24
10	18	0.526	50	27
总和	4 278.8	9.254	275	136