膨胀黏土胀缩变形规律的回归分析

Regressive analysis of swelling and shrinkage deformationrule of expansive soils

基于室内大量膨胀试验,对取自(湘)潭邵(阳)高速公路邵阳段的3种膨胀黏土的击实土样试验数据,进行了半对数线性回归分析,并研究了其胀缩变形规律。回归分析结果表明:膨胀力、膨胀量回归曲线线性相关显著,膨胀力与干密度的关系为正相关,而膨胀力与含水量及膨胀量与压力的关系为负相关。对于同一种膨胀黏土,含水量和干密度的大小是影响膨胀力、膨胀量大小的主要因素。同时,也对膨胀黏土的胀缩机理作了一些探讨。图5,表4,参7。

Based on lots of expansive tests in laboratory, for three kinds of compacted expansive clayey sampled from Shaoyang's segment in Tan-Shao speedway, the half logarithm linear regressions are done and their deformation rules has been studied. The regressive results indicated: the linear relativity of regressive curves of expansibility and swelling quantity is remarkable, the relation between expansibility and the dry density is positive; but the relations between the expansibility with moisture content and the relations between the swelling quantity with pressure are negative,for the same type of soil,the magnitudes of water content and dry density are the dominating factors for the magnitude of expansibility and swelling quantity,At the same time,the cause of swelling and shrinkage about expansive clayey is also discussed in this paper. 5figs. ,4tabs. ,7refs.