摘要
为了探讨软土固结变形特性,对两种海相沉积的漳州淤泥质土和东莞淤泥质土两类软土样进行了室内固结试验。试验结果表明,蠕变曲线ε-t呈现出衰减特征;压力与应变p-ε等时曲线的非线性特性明显,具有较好的指数关系;两类软土的主、次固结系数受加荷比的影响随固结压力变化而变化,表现为阶段性变化特征。基于Singh-Mitchell模型和采用p-ε指数函数与ε-t双曲线函数关系的组合模型,建议了应力-应变-时间关系的分段表达式,该分段模型与试验结果有更好的一致性,能较好地预测两类软土固结变形特性,并具有简单方便的优点。
To discuss consolidation properties of soft soil, we made consolidation test of the two marine mud soil samples of Zhangzhou and Dongguan. The results of creep curves ε-t show the characteristics of creep attenuation. The pressure and strain curves p-ε show apparent non-linear feature and good index relation. The coefficients of primary and secondary consolidation influenced by load ratio vary with the consolidation pressure and show stagevariable characteristics. A new expression of stress-strain-time relation is suggested based on Singh-Mitchell model and using index and hyperbolic function of stress-strain and strain-time relation respectively. Compared with two models above, the subsection model suggested has a better consistency with test results. So it is suitable to describe consolidation deformation properties of two types soil and has the advantage of easiness and conveniences.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2009年第5期35-39,52,共6页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(40572153)
关键词
海相软土
固结特性
固结系数
次固结系数
固结变形模型
marine soft soil
consolidation properties
consolidation coefficient
secondary consolidation coefficient
consolidation deformation model
