【摘要】 分析了开放系统和封闭系统块石试样内部的热传输机理。数值计算和实验结果都表明,在较大的表面温度波动条件下,封闭系统的块石试样中有一定的自然对流效应产生,其降温效应随时间具有累加性,但在试样上部分中热传导占支配地位,使得试样内温度波的振幅衰减与指数规律符合较好。因此,确定路堤、护坡块石的导热系数可以采用封闭系统的细长试样。更多还原

【Abstract】 The heat transfer mechanism in the porous block stone specimens in closed-system and opened-system are analyzed. Both the numerical calculation and experimental results show that under the larger fluctuation of surface temperature, some natural convection effect will occur in the block stone specimen in closed system. And the cooling temperature effect has the accumulative property with time, but the heat transfer in the upper portion of specimen is dominated by the thermal conduction, so that the temperature wave amplitude attenuation in specimen is in accord with index law well. Therefore, the thermal conductivity of block stone for embankment and revetment can be determined using elongated specimens in closed-system.更多还原