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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。对4种压力边界情况的碎石路堤自然对流进行了数值计算,显示透气边界的碎石路堤自然对流降温效应为最强。最后,通过引入自然对流指数,提出了实际冻土路堤碎石层填筑高度的确定方法,具体给出了粒径为2cm~4cm、4cm~6cm、6cm~8cm和8cm~10cm的碎石层填筑高度,并对粒径为6cm~8cm的碎石层填筑高度进行了实验验证,结果表明,通过自然对流指数所确定的碎石层高度对实际冻土路堤工程的设计具有参考价值。
The analysis shows that the embankment size, shape and boundary form have a significant influence on the natural convection effect of the embankment. The pressure boundary conditions of the embankment need to be determined according to the specific engineering requirements. The natural convection of crushed stone embankment with four kinds of pressure boundary conditions is numerically calculated, which shows that the natural convection cooling effect of crushed stone embankment with the permeable boundary is the strongest. Finally, by introducing the natural convection index, a method to determine the filling height of the embankment is proposed. The gravel layers with particle sizes of 2cm ~ 4cm, 4cm ~ 6cm, 6cm ~ 8cm and 8cm ~ 10cm The results show that the height of the gravel layer determined by the natural convection index has reference value for the design of actual permafrost embankment.