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为了分析粉土路基次生盐渍化的临界高度,在室内试验和COMSOL Multiphysics多场耦合数值分析的基础上,研究了黄泛盐渍土区非盐渍粉土路基次生盐渍化盐分迁移规律。研究结果表明,若路基顶部尚未形成聚盐,则路基内部不会形成明显的聚盐夹层,路基内盐分分布从底部向上整体呈现逐渐递减的趋势;建立了黄泛盐渍土区非盐渍粉土路基内部弱盐渍土形成的临界高度与地下水矿化度、地下水位至路基顶部距离的回归公式,估算粉土路基次生盐渍化内部弱盐渍土形成的临界高度;地下水矿化度对粉土路基次生盐渍化的影响程度较地下水埋深或路基填高更为显著。
In order to analyze the critical height of secondary salinization of silt subgrade, the secondary salinization of non-saline silty soil subgrade was studied on the basis of laboratory experiments and COMSOL Multiphysics numerical analysis. law. The results show that if there is no poly salt formed on the top of the roadbed, no obvious inter-salt interbed will be formed in the embankment, and the salt distribution in the subgrade will gradually decrease from the bottom to the bottom. The critical height formed by the critical height formed by weak saline soil in soil subgrade and the salinity of groundwater and the distance from groundwater level to the top of roadbed so as to estimate the critical height of formation of weak saline soil in secondary salinization of silt subgrade; The degree of secondary salinization of silt subgrade is more significant than groundwater depth or subgrade filling.