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针对青藏高原冻土区高速公路拟采用的透壁通风管碎石路堤,进行了表面开放和封闭透壁通风管碎石试样降温效果的室内试验,分析比较了表面开放和封闭边界条件对透壁通风管负温通风增强碎石路堤降温效果的影响差异。分析表明,表面开放和封闭透壁通风管碎石路堤都以外界空气通过管壁透气小孔与通风管附近碎石区域孔隙空气循环产生的强迫对流传热增强降温作用,另外,表面封闭透壁通风管碎石路堤能够在上部碎石区域产生孔隙空气循环的自然对流降温效应。因此,表面封闭透壁通风管碎石路堤的降温效果更为显著。
Aiming at the transmural ventilated gravel embankment to be used in expressway in the permafrost region of Qinghai-Tibet Plateau, indoor experiments on the effect of surface opening and closed transmissively graded macadam samples were conducted. The effects of surface open and confined boundary conditions Difference of Influence of Wall Ventilation Pipe Negative Ventilation on Cooling Effect of Crushed Stone Embankment. The analysis shows that both open-air and closed-wall ventilated gravel embankments enhance the cooling effect of the forced convection heat transfer generated by the external air passing through the air-permeable holes in the pipe wall and the pore air circulation in the crushed stone area near the ventilation pipe. In addition, the surface- Ventilation gravel embankment can generate natural convection cooling effect of pore air circulation in the upper gravel area. Therefore, the cooling effect of the surface-enclosed translucent duct gravel embankment is more significant.