Abstract Correct representation of the non-associated state-dependent behavior of the soil-structure interface is important for geotechnical applications. The original fractional plasticity is reformulated in this study, by exploring the stress-displacement relation of the soil-structure interface under plain strain condition. Without using additional plastic potentials, a state-dependent non-associated plastic flow vector is developed for the interface, where plastic flow direction is governed by the fractional gradient of yielding function. The developed interface model has eight constants, which can be all determined from laboratory tests. Further validation against a series of test results of different soil-structure interfaces shows that the developed model can well capture the constitutive behavior of the interface subjected to different boundary conditions. The typical normal-dilatancy and strain hardening/softening responses of the interface can be reasonably reproduced. © 2015 The Authors. Published by Elsevier Ltd.

中文翻译：

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土-结构界面的重新公式化分数塑性

摘要 土-结构界面的非关联状态相关行为的正确表示对于岩土工程应用很重要。本研究通过探索平面应变条件下土-结构界面的应力-位移关系，重新表述了原始的分数塑性。在不使用额外的塑性势的情况下，为界面开发了一个状态相关的非关联塑性流动矢量，其中塑性流动方向由屈服函数的分数梯度控制。开发的接口模型有八个常量，这些常量都可以通过实验室测试确定。对不同土-结构界面的一系列测试结果的进一步验证表明，所开发的模型可以很好地捕捉界面在不同边界条件下的本构行为。可以合理地再现界面的典型法向剪胀和应变硬化/软化响应。© 2015 作者。由爱思唯尔有限公司出版。