摘要
在土的三轴试验中卸载体缩现象普遍存在。卸载体缩随着围压的增加呈下降趋势。不同土和同样土在不同密度下卸载体缩的现象和原因不同。密砂的卸载体缩是剪胀可恢复的宏观体现。松砂的卸载体缩则分为两种 ,一种是塑性体缩的组成部分 ,在加载初期出现 ;另一种则是剪胀可恢复部分 ,随着剪应力的提高而出现。对于粘土 ,卸载体缩完全是塑性体缩 ,表明粘土的结构性随着加卸载过程而遭到破坏。
The phenomenon of volume contraction in unloading is very common in the triaxial tests of soils. The magnitude of volume contraction declines when the confining pressure increases. Different densities of sands result in different volume contraction in unloading. To the dense sand, the reversibility of part of dilatation is the main reason of the volume contraction. To the loose sand, the volume contraction can be classified into two kinds-one appears at the initial stage of tests as a part of the plastic contraction and the other appears with the increasing shearing stress as the reversible part of dilatation. To clay, the volume contraction is totally resulted by plastic contraction, which indicates that the structure of soils destroyed with the loading unloading process.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2002年第1期47-50,共4页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目 (598790 0 8)
关键词
三轴试验
卸载体缩
转压
密度
土
triaxial test
volume contraction in unloading
confining pressure
density of sand
