目前,由于隧道施工通风中未能充分考虑出渣工序下的实际污染物排放,因此极大地增加了隧道施工需风量,造成巨大能源浪费。依托某隧道开展了CO浓度及风速现场测试,研究了不同工序下CO浓度随时间的变化规律,分析了工程车辆排放及风机供风量对隧道CO浓度与风速分布的影响。结果表明:爆破阶段掌子面CO浓度在爆破后25 min内基本不变,约为190 mg/m3;出渣阶段掌子面CO浓度呈线性降低,通风90 min后达到规范限值(30 mg/m3);出渣阶段隧道施工实际所需风量远小于规范要求,随需风量增大回风段CO浓度呈指数衰减,提出了CO排放量及需风量耦合影响下公路隧道施工通风CO比浓度经验计算公式。
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