摘要
以湖南某高速公路K174～K186地段所取的4种膨胀土样为例,通过大量室内膨胀试验,对比研究了膨胀速度曲线、收缩速度曲线的特征。研究结果表明,尽管膨胀土的膨胀、收缩过程有很多相似特征,但在文中的试验条件下,两者并非一个完全可逆的过程,其吸水膨胀速度远比失水收缩速度要快。同时,利用非线性最小平方拟合法对胀缩曲线进行拟合,并提出胀缩曲线的曲线回归方程及其各参数的物理意义。研究结果为本地区膨胀土堤坝边坡设计以及膨胀土地基加固处理提供了依据。
Based on lots of expansive laboratory tests, in the case of the four kinds of expansive soil sampled in the segment K174～K186 of a speedway in Hunan province, the contrastive characteristics of the swell and the shrinkage speed curves have been researched in this paper. Results of these tests indicated that although the swell and the shrinkage of the expansive soil have many similar characteristics, under test conditions in this paper, they are not an entirely reversible process, and the swell speed absorbing water is much rapider than the shrinkage speed missing water. At the same time, by the method of the Nonlinear Least Square Curve Fit (NLSF), the curves of the shrinkswell speed are fitted, while the regressive equation of the shrinkswell curve and also the physical meaning of the parameters in it are put forward. Therefore, according to the test results, the important basis is provided for the design of dyke, slope, embankment and so on, and also for the technique of reinforcement and treatment to the existing expansive soil foundation in this district.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2003年第2期115-120,共6页
Journal of the China Railway Society
基金
湖南省交通厅科技发展基金项目(200006)
关键词
击实膨胀土
胀缩速度特性
NLSF
曲线回归方程
compacted expansive soil
characteristics of shrink-swell speed
NLSF
regressive curve equation
