岩土力学2011，Vol.32Issue(12)：3584-3590,7.
软土固结蠕变特性及机制研究
Experimental study of coupling behaviors of consolidation-creep of soft clay and its mechanism
摘要
Abstract
In order to analyze micromechanism and coupled behaviors of consolidation and creep of soft clay, the consolidation and creep test at different drainage conditions and different consolidation pressures and the scanning electron microscopy test of the undisturbed sample and sample after creep are carried out from soft clay in the Yellowstone region. The results show that the creep behaviors under undrained condition are even more significant compared with under drained condition. Under lower bias stress condition, the deformation under drained condition is larger comparatively and with the opposite conclusion under higher bias stress condition. The deformations under drained condition are induced by consolidation and creep which have linear creep properties; and the deformations under undrained condition are induced mainly by creep which has nonlinear creep properties. The particle distances and large pores are reducing and small pores are increasing with the transition from side - side, side - surface to surface- surface of particles contact form during creep process. The bound water with the form of penetration absorption is changed mainly into free water to excrete during consolidation process and the creep process is mainly controlled by bound water. With increasing pressure and decreasing pore volume, the hydrated film is thin to increase the viscosity of soil which takes on the behavior of creep in the long term. The drainage performance in soft-soil reinforcement can be improved to increase the consolidation degree of soil which can reduce the harms brought by creeping and improve the stability of building.关键词
软土/固结蠕变/排水条件/蠕变机制/结合水Key words
soft clay/ consolidation-creep/ drainage condition/ creep mechanism/ bound water分类
建筑与水利引用本文复制引用
张先伟,王常明,李军霞..软土固结蠕变特性及机制研究[J].岩土力学,2011,32(12):3584-3590,7.基金项目
国家自然科学基金项目(No.40572153). （No.40572153）
