摘要
为探究东北寒区公路路基黏土的基质吸力与其含水率、压实度、颗粒级配之间的关系,通过控制黏土中细粒含量,制备3种不同颗粒级配的黏土试样,采取人工压实的方法制备3种不同压实度的土样,采用离心机法测定不同颗粒级配、不同压实度条件下的重塑黏土的基质吸力。结果表明,在同一种压实度情况下,体积含水率相同时,细粒含量越多,黏土的基质吸力越大,达到饱和的含水率越小;基质吸力相同时,细粒含量多的试样土体积含水率越大,其最终的残余含水率越大;在同一种颗粒级配情况下,体积含水率相同时,压实度大的试样土基质吸力较大,并有很好的持水能力。
In order to explore the relationship of matrix suction of highway clay subgrade in cold northeast area with the moisture content,compaction degree and particle gradation,three kinds of clay samples with different particle gradations are prepared by controlling the content of fine particles in the clay,and then three kinds of soil samples with different degrees of compaction are prepared by manual compaction.The centrifuge method is used to determine the matrix suction of the reshaped clay under the conditions of different particle gradations and different degrees of compaction.The results show that,(a)under the same degree of compaction,when the volumetric moisture content is the same,the more the content of fine particles,the greater the matrix suction of the clay,and the smaller the saturated moisture content;(b)when the matrix suction is the same,the more the content of fine particles,the greater the volumetric moisture content of the soil sample,the greater the final residual moisture content;and(c)in the case of the same particle gradation,when the volumetric moisture content is the same,the sample soil with a larger degree of compaction has a greater matrix suction and a better water holding capacity.
作者
刘梦迪
郭颖
单炜
LIU Mengdi;GUO Ying;SHAN Wei(College of Civil Engineering,Northeast Forestry University,Harbin 150040,Helongjiang,China;Institute of Cold Regions Science and Engineering,Northeast Forestry University,Harbin 150040,Helongjiang,China)
出处
《水力发电》
CAS
2021年第4期39-42,62,共5页
Water Power
基金
国家自然科学基金资助项目(41641024)。
关键词
黏土路基
颗粒级配
压实度
土-水特征曲线
影响
clay subgrade
particle gradation
compaction degree
soil-water characteristic curve
effect
