卸荷下老黏土的静力特性试验研究

Static and Dynamic Response of Old Clay under Unloading

为了研究老黏土在卸荷条件下的强度和变形特性,利用应力路径三轴仪对武汉地区具有代表性的老黏土进行固结不排水三轴试验。通过与软黏土的已有研究成果进行对比,探讨了卸荷条件下老黏土主要破坏的型式和应力-应变归一化特性。基于Dun-can-Chang模型,验证了适合武汉老黏土的非线性弹性模型,总结出老黏土的变形发展规律,并给出了Duncan-Chang本构模型参数建议值。

This article focuses on strain-stress behavior of old clay in Wuhan along with different unloading ratio based on tri-axial tests, compared with researches on soft clay. With utilizing Duncan-Chang constitutive model, a favorable consideration of Wuhan old clay may be given in non-liner and non-elastic model and constitutive parameters, which would be validated by many experiments, and may be useful for conducting practical projects in terms of the acquisition of constitutive parameters and models.