Validation of a simple hypoplastic constitutive model for overconsolidated clays

Abstract

Hypoplastic constitutive models are able to describe history dependence using a single nonlinear tensorial function with a set of parameters. A hypoplastic model including a structure tensor for consolidation history was introduced in our previous paper (Wang and Wu in Acta Geotechnica, 2020, 10.1007/s11440-020-01000-z). The present paper focuses mainly on the model validation with experiments. This model is as simple as the modified Cam Clay model but with better performance. The model requires five parameters, which are easy to calibrate from standard laboratory tests. In particular, the model is capable of capturing the unloading behavior without introducing loading criteria. Numerical simulations of element tests and comparison with experiments show that the proposed model is able to reproduce the salient features of normally consolidated and overconsolidated clays.

A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

“…[70][71][72] The volumetric factor 𝑓 𝑣 is proposed to improve the model prediction of volumetric deformation. 58,63 Based on the hypoplastic model, 63 an improved hypoplastic equation is proposed to model the stiffness and volumetric behavior with various densities 73,74 :…”

On mechanical behaviour of clastic soils: numerical simulations and constitutive modelling

“…In this work, a novel hypoplastic model proposed by Wang & Wu (2020b) is used to simulate the soil matrix of the clastic soil. The model includes a structure tensor to account for the history dependence.…”

“…A better prediction in volumetric variation can be achieved by choosing different parameters for λ * and α, but this may leads to a worse prediction of the shear strength behaviour at the same time. The constitutive model shows much better performance in predicting the mechanical behaviour of structure soils ( Wang & Wu , 2020b).…”

“…(Tang et al , 2015;Wang et al , 2018) Therefore, a more advanced model incorporating both the critical state and overconsolidation is required to serve this purpose. As an alternative to the prevailing plasticity theory, hypoplastic models have gained much attention in recent years (Fuentes et al , 2019;Mašín , 2012Mašín , , 2014Wang et al , 2018c,b;Wang & Wu , 2020a;Wang et al , 2020c). Unlike elastoplastic models, hypoplastic models are able to describe the critical state and overconsolidation behaviour without using the yield surface, plastic potential, decomposition into elastic and plastic parts, and a loading criterion (Wu et al, 2017).…”

On the automatic parameter calibration of a hypoplastic soil model

“…For instance, Taiebat & Dafalias [51] added a yield surface with closed cap, Liu et al [30] and Liu and Pisano [29] introduced a memory surface which improves the model's performance under cyclic loading and allows for the simulation of several thousands of loading cycles and Barrero et al [3] improved the model for cyclic shearing of sands in semifluidized states, among others. New and further developments in the field of constitutive models for cohesive soils are for example the anisotropic visco-ISA (AVISA) model by Tafili & Triantafyllidis [50], the coupling of clay-hypoplasticity with ISA-plasticity by Fuentes et al [14], the barodesy with intergranular strain extension by Bode et al [5] or a novel hypoplastic model for overconsolidated clays by Wang and Wu [55,56].…”