深圳湾海积软土的蠕变特性与本构模型研究

论证海积软土的蠕变特性，针对深圳湾软土在固结仪上进行一维侧限压缩蠕变试验，并建立了可描述软土蠕变特性的本构模型。结果表明，深圳软土的蠕变变形主要是瞬时变形和衰减蠕变变形，应力越大蠕变效应越明显。且蠕变表现为非线性特性，应力水平越高，非线性特征越显著，剪切蠕变特征复杂。Burgers模型可以较好地描述深圳软土的蠕变特性，特别是衰减蠕变阶段与稳定蠕变阶段拟合效果良好。研究还表明，稳定蠕变变形受应力水平影响显著，表现为固结应力越大，稳定蠕变变形量越大，达到稳定标准的时间也越长。这也说明实际工程中，当土体承受较大荷载时，必须考虑因蠕变变形对建筑物的危害作用。

Oncreep behavior and model of marine clay in Shenzhen area

The one-dimensional unconfined compression creep test of Shenzhen bay marine soft clay is carried out by the consolidometer for studying marine soft clay creep property, and soft clay creep model isestablished. The result shows that Shenzhen soft clay creep deformation is mainly the instantaneous deformation and decay creep deformation. The creep deformation is nonlinear and the more obvious the greater the creep stress, and the higher the stress level, the more significant nonlinear characteristics, the complexer shear creep characteristics. The creep property of Shenzhen soft clay may be well described by the Burgers model, especially the decay creep stage and steady creep stage fit well. The steady creep deformation is significantly affected by the stress level, the greater the performance of the consolidation stress, the greater the steady creep deformation, the longer the standard time. It is revealed that in actual projects, when the load on the soil is big, we must consider the damage to buildings due to the creep deformation.