考虑土体结构性的弹塑性软化模型

采用在原料土中掺入水泥的方法，人工制备试样模拟天然大孔隙结构性土。根据人工制备试样在不同应力路径下等应力比压缩试验结果，确定出结构性土体初始屈服面和初始屈服后塑性应变增量方向；另外，根据三轴排水剪切试验结果建立了土体屈服后硬化规律。在此基础上，提出了一个能够反映土体结构性的弹塑性应变软化模型，并用试验进行了验证。结果表明，所建模型能够较好地反映结构性土体的应力变形规律。

An elastoplastic softening model of structured soil

By putting some amount of cement into soil sample, natural structured soil with macro-pores is simulated. Based on the compressive tests of different stress paths, the initially yielding curve is confirmed according to the yielding stresses of a certain stress paths, as well as the direction of the increment of plastic strain after yielding. Furthermore the hardening law is presented in accordance with the result of the triaxial drained tests. An elastoplastic softening model which can simulate the effect of the soil structure is proposed. In addition, the model is verified by the test data.