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In order to study the effect of crushed rock maintaining permafrost embankment,here,the crushed rock embankment is treated as porous media.

为了研究碎石层保护冻土地区路基的效果,将碎石路基视为多孔介质,从多孔介质对流理论出发,用Bear J摄动法推导了自然对流的发生条件,总结和分析了冷却地基研究成果,就青藏地区的冻土和气候条件,讨论了碎石路基的铺设厚度和粒径,计算厚度为0。

The crushed rock embankment can provide cool energy for the permafrost beneath it and guarantee the stability of permafrost without thawing.

冻土地区铁路碎石路基内的换热问题可以看成是多孔介质中的对流传导问题。

The analysis shows that the sizes, shapes and boundary conditions of embankment impact substantially on triggering the natural convective effect in ballast embankments.

分析表明路堤尺寸、形状和边界形式对碎石路堤自然对流效应的发生有显著影响,需要根据具体工程要求来确定路堤的压力边界条件。

Meanwhile,some advices are showed to improve the construction of synchronous crushed stone seal.

根据某旅游公路采用同步碎石路面技术的工程实例,通过对其施工基本原理的阐述,以及施工中出现的若干问题的分析,探讨了产生这些问题的关键所在。