海相结构性软黏土地基的沉降特性研究

通过室内试验获得了海相结构性软黏土的初始屈服面;考虑不同埋深处地基土的初始结构屈服面之间的相似性规律,应用结构性本构模型,结合工程实测数据,对海相软黏土地基土体屈服与地基沉降之间的关系进行了研究。结果表明,结构性本构模型能够较好地模拟海相结构性软黏土地基的沉降变形;结构性土地基的土体屈服是由浅及深逐步发展的,虽然存在低荷载时沉降小、高荷载时沉降大且呈非线性增大的现象,但这是渐变的过程,沉降量—时间—填土高度曲线上不能确定显著的转折点,通过观察沉降曲线的转折点来确定临界填土高度的方法将难以实现。

Research on Ground Settlement Characteristics of Marine Structural Soft Clay

The initial yield surface of marine structural clay was obtained by laboratory tests.The similarity of initial yield surfaces of marine clay at different depth was considered in the process of numerical analysis of structural constitutive model.Relationships between marine clay yield and ground settlement were discussed based on the comparison of numerical analysis results with actual measurement data.The results show that the structural constitutive model is suitable for numerical simulation of marine structural clay ground settlement problems.The yield of structural clay develops gradually from shallow to deep in ground,which may lead to difficulty in discrimination of the turning point on curves of relationship between settlement,time and embankment fill height.The method which is used to decide the critical height of embankment by observing the settlement curves shape might be difficult to implement.