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利用数值模拟方法 ,分析了在多年冻土地区修筑路堤后 ,夏季路基边坡积水通过路堤及在其下土壤的渗流过程中 ,由于对流换热所引起的路堤基底的不稳定现象 .通过计算机数值模拟进一步证实 ,夏季路基边坡积水可导致路基基底之下的多年冻土上限下降 ,并使路基下形成凹型融化核或扩大已有融化核的深度和范围 ,从而加大路堤的融化下沉量和冬季的冻胀量 ,造成路基稳定性程度明显下降 .
The numerical simulation method is used to analyze the instability of the embankment basement due to the convective heat transfer during the summer when the embankment is built in the permafrost region and the soil seepage process is underway in summer. Numerical simulations further confirm that water accumulation in the subgrade slope in summer can lead to the decrease of the permafrost upper limit under the subgrade and make the subgrade to form concave melting nuclei or expand the depth and range of existing melted nuclei so as to increase the melting of the embankment The amount of frost heave and the amount of frost heaving in winter have caused a significant decrease in the stability of roadbed.