摘要
针对公路路基土体中水分运移规律,建立考虑水汽相变的一维有限元模型,研究季节性温度变化与道面结构阻滞作用对水分运移过程的影响,对比分析非等温Richard渗流方法与非等温多相流数值方法在分析温度—渗流耦合问题的适用性,重点分析土体初始温度、初始含水量等因素对水分运移规律的影响.结果表明,路基表层土体含水率随季节性温度变化而波动变化,主要影响深度在0.5 m深度范围内,沿深度方向温度梯度越高,土体渗透性越大,含水率波动幅度越大.初始温度对平均含水率变化影响较大,对含水率波动幅度影响较小,初始含水率对土体干湿循环幅度的影响主要表现在"脱湿"阶段.
Abstract
Taking seasonal temperature changes and pavement structure's blocking effect into consideration,a simplified one-dimensional finite model was developed to study the water transport law in subgrade soils.For this,numerically coupling analysis of Temperature and Seepage was performed through non-isothermal Richard method and non-isothermal multiphase flow method.The influence of initial soil temperature,initial soil water content were analyzed emphatically.The results show that water content in subgrade surface fluctuate with seasonal temperature change.The main influence depth is 0.5m.Water content fluctuation enhances with the rising of temperature gradient along depth and permeability coefficient of soils.Average water content changes was obviously effected by initial temperature,while water content fluctuation was less effected by initial soil temperature.The impact of initial soil water content on water content fluctuation was mainly concentrated on desorption stage.
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