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软粘土的力学特性是粘土颗粒在荷载下的微观力学行为的宏观表现,对于软粘土微观方面的研究是了解其宏观性质的基础。该文通过唯象理论的方法建立的软粘土微结构突变模型与本构关系,能够描述软粘土流变固结的力学特性。通过一维流变固结试验对理论进行了验证,试验曲线可以用软粘土的微观特性加以解释。利用最小二乘法对模型中的参数进行了拟合,拟合曲线与试验值的符合程度较好,拟合参数的变化特点同样能体现出软粘土微观结构的力学特性。
The mechanical properties of soft clay is a macroscopic manifestation of the micro-mechanical behavior of clay particles under load. The study on microscopic aspects of soft clay is the basis for understanding its macroscopic properties. By means of the phenomenological theory, this paper presents a model and constitutive relationship of soft clay microstructure which can describe the rheological consolidation of soft clay. The theory is validated by a one-dimensional rheological consolidation test, which can be explained by the microscopic properties of soft clay. The least square method was used to fit the parameters of the model. The fitted curve fitted well with the experimental data. The changing characteristics of fitting parameters also showed the mechanical properties of soft clay microstructure.