【摘要】 针对青藏高原多年冻土地区采用的通风管路堤,利用工程流体力学理论分析了通风管系统中存在的沿程摩擦阻力损失和局部阻力损失,并根据通风管自然通风的驱动力等于路堤两侧的风场压力差,获得了通风管系统考虑沿程摩擦阻力损失和局部阻力损失的风速计算公式。结果表明:运用该公式能快速计算各种路堤通风管的通风能力,便于工程应用;加装采风口通风管路堤比传统通风管路堤能更有利于路堤及其土层的降温。更多还原

【Abstract】 Aimed at duct-ventilated embankments in permafrost regions of Qinghai-Tibet Plateau,on-way friction resistance and local resistance losses in the ventilation duct system were analyzed using engineering fluid mechanics.Based on the driving force of natural ventilation in the ventilation duct system being equivalent to the wind pressure difference between two side slopes of embankment,the calculated formulae of wind velocity considering the on-way friction loss and local resistance loss in the ventilation duct system were gotten.The results show that ventilation capabilities of ventilation duct of various embankments can be calculated quickly by applying the formulae which are convenient to engineering application.Compared with the conventional duct-ventilated embankment,the duct-ventilated embankment installed self-windward vent in the inlet of ventilation is favourable to cool down the embankment and underlying foundation soil.更多还原