水利学报2017，Vol.48Issue(6)：702-709,8.DOI:10.13243/j.cnki.slxb.20160993
基于微观孔隙通道的饱和/非饱和土渗透系数模型及其应用
A model for determining the permeability coefficient of saturated and unsaturated soils based on micro pore channel and its application
摘要
Abstract
To reveal the influence mechanism of deformation on the saturated and unsaturated permeability and establish the corresponding prediction method from the micro perspective is of great significance for seepage analysis and hydro-mechanical coupling study of saturated and unsaturated soils.Using the fluid mechanics theory,the relation between the permeability coefficient and the equivalent pore-size of micro pore channel has been established.On this basis,by using the capillary theory,a new model was presented to determine the permeability coefficient of saturated and unsaturated soils from soil-water characteristic curve (SWCC),which was testified to be reasonable based on existing experimental data.Combining this model with prediction method of SWCCs of deformation soils,the saturated and unsaturated permeability coefficients of Wuhan deformation clay were predicted.The results show that the predictions of the saturated permeability coefficients are in good agreement with the experimental results,which decrease in orders of magnitude under compression deformation condition.In double logarithmic coordinate,unsaturated relative permeability coefficients decrease with the increase of matric suction for the suction stage greater than the air entry value,which has the approximately same slope for different initial void ratio and present as a "brush" profile.In condition of the same matric suction,the smaller initial void ratio is,the greater unsaturated relative permeability coefficient is.In the suction stage smaller than the air entry value,unsaturated permeability coefficient is approximately equal to the saturated permeability coefficient.In the suction stage greater than the air entry value,unsaturated permeability coefficient decrease with the increase of matric suction,which show the approximately coincident line in the condition of different initial void ratio.关键词
变形黏性土/饱和/非饱和渗透系数/微观孔隙通道/土-水特征曲线Key words
deformation clay/saturated and unsaturated permeability coefficient/micro pore channel/soil-water characteristic curve分类
建筑与水利引用本文复制引用
陶高梁,孔令伟..基于微观孔隙通道的饱和/非饱和土渗透系数模型及其应用[J].水利学报,2017,48(6):702-709,8.基金项目
国家自然科学基金项目(51209084,41372314,51409097) （51209084,41372314,51409097）
湖北省科技厅自然科学基金项目(2015CFB297,2014CFB591) （2015CFB297,2014CFB591）
湖北省教育厅科研计划项目(D20161405) （D20161405）
优秀中青年科技创新团队项目(T201605) （T201605）
