工程地质学报2013，Vol.21Issue(3)：416-421,6.
滨海软土剪切蠕变特性研究
SHEAR CREEP PROPERTY AND CONSTITUTIVE MODEL FOR SOFT SOIL OF LITTORAL AREA IN TIANJIN
摘要
Abstract
To describe the stability and operation safety of buildings on soft soil area,this article carries out a series of shear creep tests of soft soil in Tianjin littoral area.Different vertical loads and load ratios are adopted in the shear creep instrument.It obtains the relationship of stain and stress and time in different conditions.It analyzes the structural effect and influence factors of the shear creep properties.It then establishes the corresponding constitutive model.The test results show that the shear creep properties of Tianjin littoral soft soil are obviously restricted by stress.The soil turns up attenuation creep and steady creep in low stress and destructive creep in high stress.The stress-strain presents a linear characteristics in lower stress and shows the nonlinear creep characteristics in higher stress.The smaller load ratio can not only reduce the final creep,but also improve the soft soil capacity.The nonlinear creep constitutive equation of Tianjin littoral soft soil is established with the theory of half experience and half theoretical method.The equation has the character of simple to understand,less parameters and strong practical.The model can well fit the Tianjin littoral soft soil creep characteristics through the compared analysis of experimental results and the creep model.关键词
软土/剪切蠕变/非线性/指数函数/本构模型Key words
Soft clay/ Sheer creep/ Constitutive equation/ Nonlinear/ exponential function分类
建筑与水利引用本文复制引用
雷华阳,贾亚芳..滨海软土剪切蠕变特性研究[J].工程地质学报,2013,21(3):416-421,6.基金项目
天津市软土特性与工程环境重点实验室开放基金项目(2011SCEEKL003),国家自然科学基金项目(51078262),国家重点基础研究发展计划(973)计划项目(2010CB732106). （2011SCEEKL003）
