工程地质学报2024，Vol.32Issue(1)：285-294,10.DOI:10.13544/j.cnki.jeg.2021-0700
全吸力范围非饱和持水函数和渗透性函数的预测模型
PREDICTION MODEL FOR UNSATURATED WATER RETENTION AND PERMEABILITY FUNCTION IN THE FULL SUCTION RANGE
摘要
Abstract
The water retention function and permeability function of unsaturated soils are fundamental parameters for characterizing the water retention capacity and water transportation of unsaturated soils.They exhibit distinct features in the capillary stage and adsorption stage due to different physical mechanisms.However,most traditional functions only consider the water retention and permeability properties of capillary water within the capillary stage and cannot adequate-ly characterize the adsorbed water within the adsorption stage.To address this limitation,we modified the traditional VG model,based on the traditional VG water retention function and VG-M permeability function,by correcting it with a modified parameter C(ψ).This modification allows the traditional VG model to determine the residual suction value ψr for unsaturated soils,distinguishing between capillary flow in the capillary stage and thin film flow in the adsorption stage.Additionally,considering the characteristics of thin film flow,we proposed a parameterΓ(ψ)toimprove the issue wherein the traditional VG-M permeability function often underestimates the unsaturated permeability coefficient in the adsorption stage.This led to the establishment of a permeability function model for the full suction range.Finally,we verified the rationality of the modified VG and VG-M models using three sets of measured water retention and permeabil-ity data.The results demonstrate that the prediction outcomes of the modified water retention model and permeability function model are more consistent with the measured data in the adsorption zone compared to the traditional models.关键词
非饱和土/全吸力范围/持水曲线/渗透性曲线/薄膜流动Key words
Unsaturated soil/Full suction range/Water retention curve/Permeability curve/Thin film flow分类
建筑与水利引用本文复制引用
李燕,李同录,李萍,侯晓坤,赵丹旗..全吸力范围非饱和持水函数和渗透性函数的预测模型[J].工程地质学报,2024,32(1):285-294,10.基金项目
国家自然科学基金项目(资助号:41790442,41772278).This research is supported by the National Natural Science Foundation of China(Grant Nos.41790442,41772278). （资助号:41790442,41772278）
