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A novel transversely isotropic strength criterion for soils based on a mobilised plane approach

机译：基于动员平面法的土壤横观各向同性新强度准则

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摘要

The peak shear strength rules of transversely isotropic soils are stress state dependent and dependent on relative orientation between bedding plane and principal stress. Accordingly, the shear strength of transversely isotropic soils exhibits two primary characteristics: (a) the strength curve on the deviatoric plane is asymmetrical with respect to three principal stress axes; (b) the shear strength changes with the direction angle of the bedding plane when the intermediate principal stress coefficient is a constant. In this paper, the mobilised plane is introduced and used to reveal the failure mechanism of soils. By projecting the microstructure tensor of transversely isotropic soils onto the normal of the mobilised plane, the directionality of the transversely isotropic soils is introduced into the friction rules on the mobilised plane, and a transversely isotropic strength parameter is proposed. The proposed strength parameter can extend isotropic strength criteria into transversely isotropic strength criteria. This mobilised plane approach is used to establish a novel transversely isotropic non-linear unified strength criterion (TI-NUSC). The difficulty in establishing a unified description of the asymmetrical strength curve and its evolution with direction angle is overcome by the established criterion. Comparisons between available test results and the TI-NUSC show that the TI-NUSC can successfully describe these two primary peak strength characteristics.
机译：横观各向同性土壤的峰值抗剪强度规则取决于应力状态，并且取决于层理面和主应力之间的相对方向。因此，横观各向同性土的抗剪强度表现出两个主要特征：（a）偏斜面上的强度曲线相对于三个主应力轴是不对称的； （b）当中间主应力系数为常数时，抗剪强度随垫层平面的方向角而变化。本文介绍了动员平面，用于揭示土壤的破坏机理。通过将横观各向同性土壤的微结构张量投影到动员平面的法线上，将横观各向同性土壤的方向性引入动员平面的摩擦规律中，提出了横观各向同性强度参数。提出的强度参数可以将各向同性强度标准扩展为横向各向同性强度标准。这种动员平面方法用于建立一种新颖的横向各向同性非线性统一强度准则（TI-NUSC）。建立的标准克服了建立不对称强度曲线及其随方向角演变的统一描述的困难。现有测试结果与TI-NUSC的比较表明，TI-NUSC可以成功描述这两个主要峰强度特征。

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