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为解决高原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,针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,从理论上对施工通风需风量、高原地区通风阻力做出计算和分析,选择合理的通风设备,适应不同阶段的通风方式。依托工程,基于Fluent流体力分析学软件及相关理论,对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,得到了隧道在掘进过程中扬尘浓度和气体流场的变化情况;通过模拟结果与实体监测数据相互佐证,对现有施工通风方案进行验证。
In order to solve the problem of low pressure hypoxia and ventilation during the construction of plateau extra long tunnel, taking the Xushanliang tunnel as the research object, this paper studies the ventilation technology of the extra long tunnel in the plateau. Combined with the monitoring data of air quality in tunnels at each construction stage of Xueshanliang tunnel, the air volume needed for construction ventilation and the ventilation resistance in plateau area are calculated and analyzed theoretically. Reasonable ventilation equipment is selected to adapt to different stages of ventilation. Based on Fluent fluid dynamics analysis software and related theories, the three-dimensional turbulence model k-ε turbulence model was numerically simulated under the condition of press-in ventilation air flow in tunnel main tunnel, and the dust of the tunnel during tunneling was obtained Concentration and gas flow field. Through the mutual verification of simulation results and physical monitoring data, the existing construction ventilation scheme was verified.