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为探讨防水保温对季冻区路基土长期性能的影响效果,设置了4种不同防护措施工况,采用非饱和湿热耦合有限元分析方法,模拟了不同措施下路基内部温度场、湿度场和回弹模量场分布与变化特征,得出:在路基底部设置防排水层,不能改善路基内部冻融影响范围和程度,但可提高路基修筑后的第一次冻融前的回弹模量场;而在路床顶部设置防冻保温层,可有效降低路基冻融影响深度,但难以控制路基内部湿度分布;对于地下水较高且冻结影响深度较大的季冻区路基,防水层对路基5次冻融稳定后回弹模量场的影响比保温层更为显著,为此应优先做好路基底部防水措施,同时做好路基顶部保温措施。
In order to investigate the effect of waterproof insulation on long-term performance of subgrade in quaternary soil, four different protective measures were set up. The unsaturated wet-heat coupled finite element method was used to simulate the influence of different measures on temperature, It is concluded that the installation of drainage and drainage layer at the bottom of roadbed can not improve the range and extent of the freeze-thaw influence within the roadbed, but the rebound modulus before the first freezing and thawing can be improved ; While the frost-proof insulation layer at the top of the roadbed can effectively reduce the impact of subgrade freezing and thawing depth, but it is difficult to control the humidity distribution within the embankment; for the high groundwater and freezing depth of the quarry, the waterproof layer on the subgrade 5 times After the freeze-thaw stability, the impact of the elastic modulus field is more significant than the thermal insulation layer. Therefore, waterproofing measures should be given priority to at the bottom of subgrade and thermal insulation measures should be taken at the top of subgrade.