某高原螺旋施工隧道CO分布及扩散特征

doi:10.16265/j.cnki.issn1003-3033.2022.12.0110

摘要/Abstract

摘要：

为探究某高原螺旋施工隧道内风流场分布情况及CO运移特征,提升隧道掘进面施工环境空气质量,以流体控制方程和组分运输模型为基础,运用Ansys Fluent流体仿真软件,以送风风速、掘进面与风筒口之间的距离为影响因素,模拟多个工况下的风流场和CO分布特征,并建立一种适用于测算高原螺旋施工隧道内CO质量浓度的多元线性回归模型。结果表明:沿隧道出口方向,隧道断面的平均风速在风筒口前方先增大后减小,在风筒口后方逐步趋于稳定;当掘进面与风筒口之间距离超过30 m时,射流末端和风筒口前端2个区域容易形成明显的涡流;CO质量浓度分布受风速和距离的影响呈现出“中间低,两边高”和“左低右高,上低下高”2种分布特征;隧道内不同时刻、不同截面上的CO质量浓度可按多元线性回归模型测算。

关键词: 高原地区, 螺旋施工隧道, CO质量浓度, 掘进面, 风流场

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

刘杰, 周皓文, 王婉青, 张悦, 赵湖云. 某高原螺旋施工隧道CO分布及扩散特征[J]. 中国安全科学学报, 2022, 32(12): 79-87.

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.

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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