摘要
为了研究压实黏土遇水膨胀与失水收缩特性,开展了压实黏土的膨胀与收缩试验。试验结果表明,土样的压实度和初始含水率对其膨胀与收缩影响显著。压实黏土样的膨胀量随浸水时间延长基本呈现"S"型增大。压实黏土的干缩在初期属于正常收缩;在失水干缩后期,干缩体积小于失水体积,收缩量随时间变化为下凹型曲线;最后进入稳定的零收缩阶段。压实密度越大,收缩率越小;初始含水率越高,收缩率越大。压实黏土的干缩变形具有显著的各向异性。此研究对干旱及半干旱地区黏土干缩开裂机理的研究提供理论基础。
For the purpose of studying expansion and shrinkage characteristics with losing moisture of compacted clay, the expansion and contraction tests of compacted clay were carried out under different compaction degree and initial moisture content. Based on the results of compacted clay tests, expansion and contraction are affected significantly by compaction degree and initial moisture content of soil samples. The expansion of compacted clay basically increased as the ＂S＂ type with time of flooding. Shrinkage of compacted clay belonged to the part of the normal contraction in the early period. ; in the late stage of the dehydration shrinkage, shrinkage volume was less than the dehydration volume and the amount of shrinkage varied with the change of time as the lower concave curve ; shrinkage of compacted clay entered a stable zero contraction phase finally. The compaction degree was the greater as the shrinkage was the smaller; the initial moisture content was the higher as the greater. There was significantly anisotropic about shrinkage deformation of compacted clay. provided a theoretical basis for research on the mechanism of the semi-arid areas. drying shrinkage cracking shrinkage rate was the The results of the study of clay in the arid and
出处
《武汉工业学院学报》
CAS
2013年第2期96-101,共6页
Journal of Wuhan Polytechnic University
关键词
压实黏土
膨胀
收缩
压实度
含水率
compacted clay
expansion
contraction
compaction degree
moisture content
