考虑初始孔隙率的非饱和土土 -水特征曲线模型  

A Soil-water Characteristic Curve Model for Unsaturated Soil Considering Initial Porosity

作　　者：刘光彬 韩琳琳 邵羽 LIU Guangbin;HAN Linlin;SHAO Yu(Guangxi Communications Design Group Co.,Ltd.,Nanning,Guangxi 530029,China)

机构地区：[1]广西交通设计集团有限公司,广西南宁530029

出　　处：《公路工程》2024年第4期144-148,154,共6页Highway Engineering

基　　金：广西科技计划项目(桂科AB22080061);南宁市“邕江计划”青年人才专项项目(RC20230108)。

摘　　要：为了构建考虑初始孔隙率的非饱和土土-水特征曲线模型,从土体的孔隙分布规律出发,通过对参考状态下孔隙尺寸分布曲线的平移缩放得到任意荷载状态下的土体孔隙尺寸分布曲线,并结合Yong-Laplace方程与VG模型推导得到了可考虑初始孔隙率的土水特征曲线模型。该模型仅包含5个参数且其物理意义明确,且仅需通过参考状态的土水特征曲线确定模型参数,即可用得到的参数预测任意初始孔隙比的土水特征曲线。通过5组试验数据对所提出的模型进行验证,结果表明该模型可较好地模拟不同初始孔隙率下的非饱和土持水特征。To construct a soil water characteristic curve model of unsaturated soil considering initial porosity,starting from the pore distribution law of the soil,the soil pore size distribution curve under any load state was obtained by translating and scaling the pore size distribution curve under the reference state.Combined with the Yong Laplace equation and VG model,a soil water characteristic curve model considering initial porosity was derived.This model only contains 5 parameters with clear physical meanings,and only needs to determine the model parameters through the soil water characteristic curve of the reference state,which can be used to predict the soil water characteristic curve of any initial pore ratio.Five groups of experimental data were used to verify the proposed model.The results show that the model can well simulate the water holding characteristics of unsaturated soil under different initial porosity.

关 键 词：初始孔隙率 非饱和土 土水特征曲线 孔隙分布 

分 类 号：TU43[建筑科学—岩土工程]