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UH MODEL FOR SOILS AND ITS EXTENTION

机译：UH土壤模型及其扩展

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Based on the relationship between the current yield surface and the reference yield surface,the UH model,called the three-dimensional unified hardening model for overconsolidated clays,has been proposed.The key feature of the UH model is adoption of a unified hardening parameter that is independent of stress paths.To evaluate the potential peak stress ratio in overconsolidated clays,a parabolic Hvorslev envelope rather than a straight line is adopted to modify the UH model.This modification leads to more realistic predictions on highly overconsolidated clays than with a straight line in the original UH model,and is consistent with critical state soil mechanics wherein the higher peak stress ratio shown in overconsolidated clays is a result of dilatancy rather than cohesion.The UH model has been developed and extended,and now it can consider the influence ofanisotropy,suction,temperature,etc.The Generalized Non-linear Strength Theory (GNST) has been proposed based on the test date of frictional material and previous research achievements in this field.It describes non-linear strength properties on the π-plane and the meridian plane using a unified formula.Through the transformed stress space based on the GNST,the combination of the GNST and the UH model using p and q as stress parameters can be realized simply and rationally in three-dimensional stress state.
机译：根据当前屈服面与参考屈服面之间的关系，提出了UH模型，即超固结黏土的三维统一硬化模型。UH模型的主要特点是采用了统一的硬化参数为了评估超固结黏土的潜在峰值应力比，采用抛物线Hvorslev包络线而不是直线来修改UH模型，这种修改导致对高度超固结黏土的预测比对直线更现实在原始的UH模型中，并且与临界状态土壤力学一致，在超临界模型中，超固结黏土中较高的峰值应力比是由于剪胀而不是内聚引起的。UH模型已经开发和扩展，现在可以考虑各向异性的影响根据fr的测试日期提出了广义非线性强度理论（GNST）该领域的实用材料和先前的研究成果。它使用统一的公式描述π平面和子午线上的非线性强度特性。通过基于GNST的变换应力空间，GNST和UH模型的组合在三维应力状态下，可以简单合理地使用p和q作为应力参数。

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