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目前大多数非饱和土的弹塑性本构模型用非饱和击实土的试验结果进行验证,但现场其他类型的土,如沉积土经常有在非饱和状态下外部环境变化的情况。现有的非饱和土弹塑性模型是否适用于沉积土一类的现场土是需要研究的课题。进行非饱和上海第③层土的吸力控制排水排气三轴剪切试验,使用文中提出的能统一考虑非饱和土水力性状和力学性状的弹塑性本构模型,预测上述三轴试验结果,并与试验数据进行比较。比较结果显示,建立的本构模型能够很好地预测非饱和上海软土的水力和力学性质,说明该模型不仅可以适用击实土的预测,还能够很好地适用于其他类型非饱和土的水力和力学性质的模拟。
At present, the elasto-plastic constitutive models of most unsaturated soils are validated by the experimental results of unsaturated compacted compacted soils. However, other types of soils, such as sedimentary soils, often have changes in the external environment under non-saturated conditions. Whether the existing unsaturated elasto-elasto-plastic model is suitable for on-site soil such as sedimentary soil is a subject to be studied. The triaxial shear tests of suction control drainage and exhaust in the third layer of unsaturated Shanghai were carried out. The elasto-plastic constitutive model that unified the hydraulic and mechanical properties of unsaturated soil was put forward to predict the above triaxial test results. Compare with test data. The results show that the established constitutive model can predict well the hydraulic and mechanical properties of unsaturated Shanghai soft soil, which shows that the model can not only predict the compacted soil, but also can be well applied to other types of unsaturated soils Simulation of hydraulic and mechanical properties.