西安建筑科技大学学报(自然科学版)

硫酸盐渍土地区路基盐胀等病害易发且种类多样,病害的发生与盐渍土中含水率和含盐量有很大关系,同时不同含水率和含盐量引起的吸力值变化对其也有较大影响.为研究硫酸盐渍土中吸力值与含盐量和体积含水率的关系,以室内配置硫酸盐渍土作为研究对象,通过滤纸法测定不同含盐量和体积含水率下的硫酸盐渍土的吸力值,并绘制不同含盐量条件下的土水特征曲线和建立渗透吸力与含盐量、体积含水率之间的关系.结果表明:在一定范围内,体积含水率与总吸力之间呈指数关系; 渗透吸力=f(含盐量,体积含水率)的拟合模型确定为Linear model Poly 21.

Salt expansion and other diseases take place easily and are varied in the subgrade of sulphate saline soil areas. It is greatly related to the water content, salinity and the occurrence of diseases, and different water content and salinity causing the change in suction also has great influence on the occurrence of diseases. In order to study the relation among suction value, salinity and volumetric moisture content, the paper takes filter paper method to determine the suction value under different volumetric water content and salt content, and draws the soil water characteristic curve under different salt content. It established the relation among the osmotic suction, salinity and volumetric moisture content. The results showed an exponential relation between the volumetric water content and total suction within a certain range. The fitting model of “osmotic suction=f(salt content, volumetric water content)” is determined as Linear model Poly 21.

引言
1 滤纸法测试试验
2 硫酸盐渍土总吸力与体积含水率的关系研究
3 渗透吸力与含盐量、体积含水率关系的研究
4 结论

表1 土样的基本物理特性指标<br/>Tab.1 Basic physical characteristics of soil samples

表1 土样的基本物理特性指标
Tab.1 Basic physical characteristics of soil samples

图1 取土试样
Fig.1 Soil sample

图2 不同硫酸盐含量的盐渍土土水特征曲线<br/>Fig.2 Soil water characteristic curve of saline soil with different sulfate content

图2 不同硫酸盐含量的盐渍土土水特征曲线
Fig.2 Soil water characteristic curve of saline soil with different sulfate content

表2 基质吸力和体积含水率关系的拟合方程<br/>Tab.2 Fitting equations for the relationship between matrix suction and volumetric moisture content

表2 基质吸力和体积含水率关系的拟合方程
Tab.2 Fitting equations for the relationship between matrix suction and volumetric moisture content

图3 含盐量与渗透吸力关系曲线图<br/>Fig.3 salinity and osmotic suction

图3 含盐量与渗透吸力关系曲线图
Fig.3 salinity and osmotic suction

图4 渗透吸力与含盐量、体积含水率的双变量关系<br/>Fig.4 Bivariate relationship between osmotic suction and salinity and volumetric moisture content

图4 渗透吸力与含盐量、体积含水率的双变量关系
Fig.4 Bivariate relationship between osmotic suction and salinity and volumetric moisture content

图5 渗透吸力与含盐量、体积含水率圆滑处理<br/>Fig.5 Osmotic suction and salinity, volumetric moisture content smoothing

图5 渗透吸力与含盐量、体积含水率圆滑处理
Fig.5 Osmotic suction and salinity, volumetric moisture content smoothing

图6 渗透吸力与含盐量、体积含水率的三维曲面图<br/>Fig.6 Three-dimensional surface map of osmotic suction and salinity and volumetric moisture content

图6 渗透吸力与含盐量、体积含水率的三维曲面图
Fig.6 Three-dimensional surface map of osmotic suction and salinity and volumetric moisture content

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备注

引言

1 滤纸法测试试验

2 硫酸盐渍土总吸力与体积含水率的关系研究

3 渗透吸力与含盐量、体积含水率关系的研究

4 结论

期刊信息