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超固结非饱和土统一硬化(UH)模型在分析超固结非饱和土问题中有广泛的适用性,其不仅可以使超固结状态下的湿化模拟更为合理,也能够反映超固结非饱和土的硬化、软化等特性。在超固结非饱和土本构模型的基础上,考虑土体团粒的吸水膨胀作用,提出了考虑膨胀效应的UH模型。该模型只比超固结非饱和土UH模型增加了一个参数,不仅能够描述普通加载路径下超固结膨润土的应力应变特性,还能反映其在湿化路径下的膨胀效应。基于有限元软件的二次开发平台,进行了考虑膨润土膨胀效应UH模型的有限元实现,并通过对三轴试验和膨胀力试验的数值模拟,验证了模型子程序的合理性。
The uniform hardening (UH) model of overconsolidated unsaturated soil is widely applicable to the analysis of overconsolidated unsaturated soils. It can not only make the wetting simulation in the overconsolidated state more reasonable but also reflect the over-solidification Knot unsaturated soil hardening, softening and other characteristics. Based on the constitutive model of overconsolidated unsaturated soil, considering the water absorption and swelling of soil aggregates, a UH model considering the expansion effect is proposed. This model only adds a parameter to the UH model of over-consolidated unsaturated soil, which can not only describe the stress-strain behavior of overconsolidated bentonite under common loading path, but also reflect its expansion effect under wetting path. Based on the secondary development platform of finite element software, the finite element method of UH model considering the swelling effect of bentonite was carried out. The rationality of model subroutine was verified by numerical simulation of triaxial test and expansive force test.