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- 2018
基于施工隧道压入式通风方式结构设置优化
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Abstract:
针对钻爆法施工隧道中压入通风方式造成的隧道内空气质量差、排尘久等缺点，在传统通风方式的基础上进行结构优化改进，形成抽出式风幕通风方式.以吴家岭二级水电站新建I号、Ⅱ号引水隧道为试验隧道，对两种通风方式条件下隧道内风速及游离SiO2粉尘扩散特点进行现场监测与对比分析，并应用有限元Ansys-CFD软件对游离SiO2粉尘浓度场演化特征进行了模拟分析.研究结果表明：在抽出式风幕通风条件下通风35 min后，施工作业区内游离SiO2粉尘浓度即可达标，洞身区只存在少量极低浓度SiO2粉尘，作业区内SiO2粉尘浓度最大净化率较压入式通风方式提高了25.93%，隧体内施工环境大为改善.
：Considering the disadvantages of poor air quality and prolonged dust removal caused by the forced ventilation mode in tunnel construction using drilling and blasting methods,the extractive and air curtain ventilation mode was developed by structure optimization and improvement over the traditional ventilation mode. Diversion tunnels I and Ⅱ of Wujialing second stage hydropower station were used as the research site,with wind speed and characteristics of free SiO2 dust diffusion monitored and comparatively analysed on site. Moreover,the evolution characteristics of the free SiO2 dust concentration field were simulated and analysed using Ansys-CFD. The results indicate that the concentration of free SiO2 dust in the working area can reach the standard after ventilating for 35 min under the extractive and air curtain ventilation mode,with little free SiO2 dust and a low concentration of dust in the tunnel body area. In addition,the maximum purification rate of SiO2 dust in the working area is 25.93% higher than that in the forced ventilation mode,and the construction environment in the tunnel is greatly improved
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