天然软粘土屈服性状的试验研究与本构模拟

为研究结构性及各向异性对天然软粘土屈服特性的影响，对上海软粘土进行了一系列相关试验，包括一维固结试验、三轴不排水剪切试验以及三轴排水应力路径剪切试验；同时在单面边界面模型框架内，引入考虑结构性及各向异性影响的内变量，建立本构方程。通过对边界面与传统屈服面模型计算结果的对比，证明了边界面模型在模拟天然软粘土屈服性状上具有一定的优势；通过对天然软粘土各种屈服试验结果的模拟，验证了模型的合理性。结果表明：修正后的边界面模型可以更有效地反映天然软粘土的变形特性。

Test Research and Constitutive Simulation on Yielding Characteristic of Natural Soft Clay

To study the influence of structure and anisotropy on yielding characteristic of natural soft clay , a series of relative tests for Shanghai soft clay were carried out , including one-dimensional consolidation test ,triaxial undrained shear test and drained stress probe test .At the same time , both structural and anisotropic inner variables were introduced into constitutive equations on the basis of single bounding surface model . The advantage of bounding surface model was verified by comparing the calculation results between the traditional yielding surface model and bounding surface model .The reasonability of the model was verified by the test results of yielding characteristic of natural soft clay .The results show that the modified bounding surface model can reflect the deformation characteristic of natural soft clay more efficiently .