Abstract This paper presents a model that describes the gradual yielding of unsaturated cemented soils subjected to isotropic loading. The model relies on the definition of a “cementation bonding function” which accounts for the progressive breakage of inter-granular cementation caused by loading. The combination of this cementing bonding function with the unsaturated model of Gallipoli and Bruno (2017) leads to the formulation of a “cemented unified normal compression line” (CUNCL), which describes the virgin behaviour of both cemented and uncemented soils under saturated and unsaturated conditions. Gradual yielding is described by assuming that, as the soil state moves towards the CUNCL, the slope of the loading curve tends towards the slope of the CUNCL. The model describes the hysteretic variation of void ratio for both cemented and uncemented soils under saturated and unsaturated conditions by using only seven parameters, i.e. five parameters for the uncemented behaviour plus two extra parameters accounting for the effect of cementation. The model has been calibrated and validated against the experimental data of Arroyo et al. (2013) demonstrating a good performance to describe the uncemented and cemented behaviour of soils under saturated and unsaturated conditions.

中文翻译：

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各向同性应力作用下非饱和胶结土的边界面力学模型

摘要 本文提出了一个描述非饱和胶结土在各向同性荷载作用下逐渐屈服的模型。该模型依赖于“胶结结合函数”的定义，该函数解释了由载荷引起的粒间胶结的逐渐破坏。这种胶结结合函数与 Gallipoli 和 Bruno (2017) 的不饱和模型的结合导致了“胶结统一法向压缩线”(CUNCL) 的公式，它描述了在饱和和非饱和状态下胶结和未胶结土壤的原始行为使适应。逐渐屈服是通过假设随着土壤状态向 CUNCL 移动，加载曲线的斜率趋向于 CUNCL 的斜率来描述的。该模型仅使用七个参数来描述在饱和和非胶结条件下胶结土和未胶结土的孔隙比的滞后变化，即五个未胶结行为参数加上两个考虑胶结效应的额外参数。该模型已经根据 Arroyo 等人的实验数据进行了校准和验证。(2013) 展示了描述饱和和非饱和条件下土壤的未胶结和胶结行为的良好性能。