In order to solve the problem of low oxygen, low pressure, difficult ventilation in extra long tunnel construction in plateau area, this paper took Xueshanliang tunnel as study object, studied the ventilation technology for extra-long tunnel construction in plateau area. Combined with air quality monitoring data of Xueshanliang tunnel at all construction stage, this paper carried out theoretical calculation and analysis to ventilation demand and ventilation resistance for tunnel construction in plateau area, so to select proper ventilation facilities to accommodate ventilation at different construction stage. Besides, based on Fluent fluid mechanics analysis software and related theories, The numerical simulation was carried out using 3 D turbulence k-εtwo-equation turbulence model to the main hole of Xueshanliang tunnel under pressure-type ventilation air flow condition, so to get the change of dust concentration and gas flow field during the tunneling process, the numeric analysis results were compared with the real monitoring data to seek the weak spots in ventilation technology, thus to compensate and optimize the construction ventilation solution.%为解决高原地区特长隧道施工期间缺氧低压、通风困难的问题,以雪山梁隧道工程为研究对象,对高原地区特长隧道施工通风技术展开研究.结合雪山梁隧道各施工阶段隧道内的空气质量监测数据,从理论上对高原地区隧道施工通风需风量、通风阻力进行计算和分析,以便选择合理的通风设备,适应不同施工阶段的通风方式.另外,基于Fluent流体力学分析软件及相关理论,对雪山梁隧道主洞在压入式通风气流运动条件下采用三维紊态k-ε双方程湍流模型进行数值模拟,得到隧道在掘进过程中扬尘浓度和气体流场的变化情况,并将数值分析结果与实体监测数据进行比较,找出通风技术环节的不足,使施工通风方案得以补充和优化.
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