摘要
采用压力膜仪对非饱和重塑土在不同干密度下的土水特征曲线进行了研究。试验结果表明:试样干密度越小,低吸力段曲线斜率变化越大,残余含水率越低,持水能力越差。随着吸力增加,其含水率随基质吸力增大而减小的幅度越来越小,最后趋于平缓。采用幂函数对获取的数据进行拟合,拟合效果较理想。对比VG模型,吻合度较高。同时,采用微型贯入仪对每级吸力作用下的土样进行贯入试验,获取基质吸力与地基承载力、液性指数及压缩模量的关系。
Pressure plate extractor is used to study the soil water characteristic curve of unsaturated remolded soil under different dry densities.The results showed that(1)when the sample has smaller dry density,the slope of soil water characteristic curve has higher variation during the low suction segment,the residual water rate is lower,and the moisture holding capacity is worse;(2)with the increase of suction,the decreasing range of moisture content becomes smaller with the increase of matrix suction and tends towards stability;(3)the power function has good results to fit the obtained data obtained;and(4)the soil water characteristic curve results are similar to those tested by VG model.At the same time,penetration tests were carried out for the soil samples under each suction effect using the micro penetrometer,and the relationships between matric suction and bearing capacity of the foundation,liquid index,and compression modulus were obtained.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2015年第6期1138-1142,共5页
South-to-North Water Transfers and Water Science & Technology
关键词
非饱和土
压力膜仪
基质吸力
土水特征曲线
数据拟合
幂函数
VG模型
微型贯入仪
unsaturated soil
pressure plate extractor
matrix suction
soil water characteristic curve
data fitting
power function
VG model
micro penetrometer
