Numerical simulation study of affecting spraying and dust reduction in deeply buried tunnels constructed by drill-and-blast method

doi:10.16265/j.cnki.issn1003-3033.2024.11.1591

Abstract

Abstract:

Tunnel construction projects in China have developed rapidly, and significant dust hazards are associated with drilling and blasting construction. To improve the effectiveness of spraying to reduce dust in tunnels, this article uses digital simulation and a tunnel model was created using ANSYS. The variations in dust mass concentration distribution under different conditions, such as surrounding rock temperature, jet velocity, and nozzle diameter, were investigated in the study. The results show that as the surrounding rock temperature increases, dust movement becomes more intense, which significantly affects dust reduction efficiency. The dust capture effect of atomized water droplets decreases with the increase in surrounding rock temperature. With the increase of water jet velocity, the water pressure in the jet pipe increases, improving the dust capture effect of the droplets. Dust reduction efficiency decreases with increasing nozzle diameter. When the nozzle diameter is too large, the ability of water mist to capture particles weakens. Conversely, a smaller nozzle diameter improves dust reduction efficiency. However, if the nozzle diameter is too small, too much splash water spray rather than affect the efficiency of the dust.

Key words: drilling and blasting construction, deep buried tunnels, spraying to reduce dust, numerical simulation, surrounding rock temperature, jet velocity, nozzle diameter

CLC Number:

X964工业防尘

ZHOU Yuzhu, WEI Dingyi, CAO Weijie, LU Zengxiong, LIN Minglei, DU Xiaokun. Numerical simulation study of affecting spraying and dust reduction in deeply buried tunnels constructed by drill-and-blast method[J]. China Safety Science Journal, 2024, 34(11): 66-72.

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计算模型	模型设定
求解器	基于压力
能量方程	打开
湍流模型	k-ε模型
DPM	打开

DPM	模型设定
DPM迭代间隔	20
最大步数	50 000
虚拟质量力	打开
压力梯度力	打开
喷射源类型	面源
粒子类型	惰性
材料	灰质
质量流率/(kg·s^-1)	5.71
阻力特征	球形颗粒

边界条件	参数设定
水力直径/m	2.84
湍流强度/%	10
出口边界类型	流出
DPM条件	逃逸/反弹
壁面	无滑移