交叉隧洞施工通风流场特性研究

施工通风贯穿交叉隧洞施工全过程，是确保施工进度、保障工程安全的关键。针对现有通风方案设计主要依靠经验，缺乏相应的理论支持，常常造成资源浪费等问题，构建交叉隧洞的三维模型，采用基于流体力学理论的数值计算方法模拟交叉隧洞通风流场，通过对隧洞中通风流量占比、风速大小分布的比对，可定量分析交叉角度、施工顺序、串联风机位置等因素对通风流场的影响特性，并提出减小交叉角度、协调施工进度、合理安置串联风机等改善不同情况下通风效果的合理建议。为交叉洞施工通风方案的优化设计提供参考。

Characteristic Research on Construction Ventilation Flow Field of Cross Tunnel

Construction ventilation was applied in the whole process of cross tunnel construction, which was an important technique to ensure engineering safety and accelerate construction schedule. The existing ventilation plan mainly depended on the experience by lack of theoretical support, often resulting in the waste of resources, and so on. Therefore, 3-D numerical simulation of cross tunnel was built and the numerical method based on fluid mechanics theory was adopted to simulate ventilation flow field. In comparison with the ventilation flow proportion and wind velocity distribution, the ventilation flow field under different cross angles, construction sequences and position of fans in series was analyzed quantitatively. Meanwhile, reasonable suggestions such as decreasing cross angle, coordinating construction progress and reasonably setting fans in series were proposed to improve ventilation effects in different conditions. This project provided reference for ventilation system optimization design of cross tunnel construction.