An isotach elastoplastic constitutive model devised by Yang et al. (2016) and referred to as the Hunter Clay (HC) model attempts to capture a number of key behaviours of soft soils within a critical state framework, namely destructuration, fabric anisotropy and rate dependency, the latter often manifesting in creep settlement. Finite element implementation of the HC model is a useful means by which its application to practical problems can be facilitated. However, there are a number of significant challenges associated with the translation of isotach elastoplastic models into a finite element setting. In this paper, a detailed discussion of these challenges is undertaken and a new finite element implementation of the HC model is subsequently developed. This includes sophisticated numerical integration algorithms which employ automatic time substepping for solution of the governing finite element equations. The ability of the implemented HC model to predict the mechanical behaviour of soft soils under 1D compression is investigated via simulation of laboratory tests carried out on Ballina clay by Pineda et al. (2016) and Parkinson (2018).

Yang等人设计的等距弹塑性本构模型。(2016) 并称为 Hunter Clay (HC) 模型试图在临界状态框架内捕获软土的许多关键行为，即破坏、结构各向异性和速率依赖性，后者通常表现为蠕变沉降。HC 模型的有限元实现是一种有用的手段，可以促进其在实际问题中的应用。然而，将等距弹塑性模型转换为有限元设置存在许多重大挑战。在本文中，对这些挑战进行了详细讨论，随后开发了 HC 模型的新有限元实现。这包括复杂的数值积分算法，这些算法采用自动时间子步法来求解控制有限元方程。通过模拟 Pineda 等人在 Ballina 粘土上进行的实验室测试，研究了实施的 HC 模型预测一维压缩下软土力学行为的能力。(2016) 和帕金森 (2018)。