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为了研究路基内含水率分布规律,确定地下水位、降雨和蒸发作用对路基材料含水率的影响,建立了基于非饱和渗流原理的有限元模型,进行稳态及瞬态的渗流计算,模拟粉质粘土、砂质粘土、亚粘土和亚砂土4种路基及边坡材料含水率的变化规律;通过埋设频域反射仪得到路基含水率年变化规律。研究结果表明:4种路基的含水率均随地下水位的升高呈指数形式上升,持续的降雨和蒸发作用对路基边坡影响深度范围为0.2～0.6m;基于非饱和渗流原理的有限元模型对路基含水率的预估具有较高的精度,能够达到工程应用要求。
In order to study the distribution rule of moisture content in subgrade and determine the effect of groundwater level, rainfall and evaporation on moisture content of subgrade material, a finite element model based on unsaturated seepage principle was established to calculate steady state and transient seepage flow, Clay, sandy clay, sub-clay and sand soil subgrade and slope material moisture content of the four changes; by embedding the frequency domain reflectometer subgrade moisture content of the annual variation. The results show that the moisture content of all four subgrade increases exponentially with the rise of groundwater level, and the continuous rainfall and evaporation affect the subgrade slope depth from 0.2 to 0.6 m. Based on the finite element model of unsaturated seepage The water content of subgrade prediction has high accuracy, can meet the engineering requirements.