软粘土的次固结变形特性

在笔者所改装的应力式三轴压缩仪和一维压缩仪上,用杜湖、杭州和萧山三种粘土做了一定数量的固结试验。基于这些试验资料的分析,提出了一种新的主、次固结变形划分法,同时还探讨了固结应力和应力比对次固结系数的影响、固结后期的孔隙水压力、高载增量比对次固结变形比例的影响。根据室内外试验资料,分析了主固结阶段的粘滞蠕变效应。结果表明,主固结阶段的粘滞变形很不显著,可忽略不计。

On the secondary deformation of soft clay

A series of consolidation tests with pore water pressure measurements on Du Lake, Hangzhou and Xiaoshan clays have been carried out on the stress-control triaxial apparatus and Oedometer improved by the authors. Based on the test results,a new method of dividing the primary and secondary deformation is proposed. The influence of the stress ratio on the coefficint of secondary deformation, the pore water pressures at the later stage of the consolidation process, and the influence of the stress increment ratio on the percentage of secondary deformation are investigated. The analytic results of the laboratary and field measurement show that the creep effect at the primary consolidation stage is so smalt that it may be negligible.