双洞互补式通风常应用于左右线通风负荷比过大的隧道。为进一步提升其在公路隧道纵向通风节能方面的优势,在双洞互补式通风的基础上,结合代偿理念对互补式通风需风量计算进行优化,修正总需风量计算公式。从需风量和通风负荷比的角度对基于代偿理念的互补式通风的适用性进行研究,将隧址温度和海拔高度、隧道长度和坡度、隧道交通量和大型车比例等因素对互补式需风量和代偿互补式需风量的影响进行对比分析。结果表明:修正后的代偿互补式需风量计算方法具有显著优势,海拔高度的提高会降低该计算方法的优势;当隧道长度大于4 000 m、隧道坡度大于1.5%时,采用基于代偿理念的双洞互补式通风更经济实用;当隧道交通量在25 000 pcu/d~30 000 pcu/d之间,大型车比例不低于35%时,或隧道交通量大于30 000 pcu/d,大型车比例不低于25%时,宜采用基于代偿理念的双洞互补式通风。
Twin-tube complementary ventilation is often used in tunnels where the ventilation load ratio of the left and right lines is too large. In order to further improve its advantages in the longitudinal ventilation energy saving of highway tunnels, based on the twin-tube complementary ventilation, combined with compensation concept, the complementary ventilation required ventilation volume was optimized, and the calculation formula of the total required ventilation volume was modified. The applicability of complementary ventilation based on compensatory concept was studied from the perspective of required ventilation volume and ventilation load ratio, the effects on the complementary required ventilation volume and compensatory complementary required ventilation volume were investigated and analyzed in terms of the influence factors, such as altitude, temperature, tunnel length, longitudinal slope, traffic flow, traffic composition and interval between the two tubes. The results show that: The modified compensatory complementary required ventilation volume calculation method has significant advantages, and the advantages of this calculation method will be reduced with the increase of altitude; it is the more economic way to apply the compensatory complementary ventilation system in twin-tube tunnels with lengths are greater than 4 000 m and slopes are greater than 1.5%. It is suitable to adopt twin-tube complementary ventilation based on compensation concept when the tunnel traffic volume is between 25 000 pcu/d and 30 000 pcu/d, the proportion of large vehicles is not less than 35% or the tunnel traffic volume is greater than 30 000 pcu/d, the proportion of large vehicles is not less than 25%.
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