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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。
In order to investigate the consolidation and deformation characteristics of soft soil, two kinds of soft clay samples of two types of marine sediments, namely, Zhangzhou silt soil and Dongguan silty soil were tested in laboratory. The experimental results show that the creep curve ε-t shows decay characteristics. The nonlinear characteristics of pressure-strain isotropic p-ε isochronal curve with good exponential relationship. The main and secondary consolidation coefficients of two kinds of soft soils are affected by The influence of the charge ratio changes with the consolidation pressure, showing the characteristics of periodic changes. Based on the Singh-Mitchell model and the combined model using the p-ε exponential function and the ε-t hyperbolic function, a piecewise expression of the stress-strain-time relationship is proposed, which is in good agreement with the experimental results It can predict the consolidation deformation characteristics of two kinds of soft soil well and has the advantages of simplicity and convenience.