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采用块石路堤、护坡有利于冻土地区路基的稳定性 .基于气温波动条件下块石内部的温度波动幅度按指数规律衰减 ,介绍了块石的热扩散系数和导热系数测量方法 .实验中 ,采用封闭的块石试样筒 ,通过顶板温度波动的控制来模拟气温的周期性变化 ,整个试样筒用绝热性能良好的海棉包扎 ,使其侧向、底板绝热 .对粒径为 6～ 8cm ,4～ 6cm ,2～ 4cm的 3种块石试样进行了具体测量 ,由曲线拟合所得的结果具有较好的一致性 .分析显示粒径较小的块石其热扩散系数和导热系数也较小
The slope embankment and block slope protection are favorable to the stability of subgrade in permafrost region.Based on the exponential decay of the temperature fluctuation of block stone under fluctuating temperature conditions, the thermal diffusivity and thermal conductivity measurement of block stone are introduced.In the experiment, A closed stone sample tube was used to simulate the periodic change of air temperature through the control of the temperature fluctuation of the top plate.The whole sample tube was wrapped with sponge with good adiabatic properties to make the lateral and bottom plates heat- 8cm, 4 ~ 6cm, 2 ~ 4cm 3 kinds of stone samples were measured, the results obtained by the curve fitting has a good consistency.The analysis shows that the smaller particle size of the stone’s thermal diffusivity and thermal conductivity Coefficient is also smaller