摘要
基于南京河西地区原状和重塑软粘土的一系列一维次固结试验,探讨了预压荷载、加荷比、加荷方式对重塑软土次固结系数的影响以及原状土的次固结变形特征。试验结果表明:当荷载小于预压荷载时,预压能明显减小次固结系数,反之,预压对次固结系数的影响不明显;加荷比对次固结系数的影响明显,次固结系数随加荷比的增大而增大;分级加荷对应的次固结系数要大于分别加荷所对应的次固结系数;该地区原状土的蠕变属于衰减蠕变。
Based on a series of 1D secondary consolidation tests for natural and remolded soft clay samples at Hexi region in Nanjing, the pre--pressure, the load ratios and the loading methods on secondary consolidation properties of remolded samples and deformation characteristics of the natural samples have been researched. The results show that the pre-consolidation pressure can significantly reduce the secondary consolidation coefficient when the consolidation pressure is less than pre-pres- sure. Otherwise, the effect of pre-pressure on the secondary consolidation coefficient is not obvious. Increase of the load ratios is able to increase the secondary consolidation coefficient. The corresponding secondary consolidation coefficient of the step loading is greater than the separate loading. The creep deformation of natural samples in the region has the character of decay slowly.
出处
《岩土工程技术》
2011年第2期68-71,共4页
Geotechnical Engineering Technique
关键词
软土
主固结
次固结
次固结系数
soft clay
primary consolidation
secondary consolidation coefficient
deformation
