Numerical Modeling on Small-Strain Stiffness and Viscoelastic-Viscoplastic Characteristic of Soft Soils

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Zhi Yong Ai, Gan Lin Gu, Jun Tao Yuan
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引用次数: 0

Abstract

The behavior of soft soils distributed in coastal areas usually exhibits obvious time-dependent behavior after loading. To reasonably describe the stress-strain relationship of soft soils, this paper establishes a viscoelastic-viscoplastic small-strain constitutive model based on the component model and the hardening soil model with small-strain stiffness (HSS model). First, the Perzyna's viscoplastic flow rule and the modified Hardin–Drnevich model are introduced to derive a one-dimensional incremental Nishihara constitutive equation. Next, the flexibility coefficient matrix is utilized to extend the one-dimensional model to three-dimensional conditions. Then, by combining the HSS elastoplastic theory with the component model, the viscoelastic-viscoplastic small-strain constitutive model is subsequently established. To implement the proposed model for numerical analysis, the corresponding UMAT subroutine is developed using Fortran. After comparing the results of numerical simulations with those of existing literature, the reliability of the constitutive model and the program written in this paper is verified. Finally, numerical examples are designed to further analyze the effects of small-strain parameters and viscoelastic-viscoplastic parameters on the time-dependent behavior of soft soils.

软土小应变刚度和粘弹粘塑性特性数值模拟
沿海地区软土在加载后表现出明显的时间依赖性。为了合理地描述软土的应力应变关系,本文在构件模型和具有小应变刚度的硬化土模型(HSS模型)的基础上建立了粘弹粘塑性小应变本构模型。首先,引入Perzyna粘塑性流动规律和改进的Hardin-Drnevich模型,推导出一维增量式Nishihara本构方程;其次,利用柔度系数矩阵将一维模型扩展到三维条件。然后,将HSS弹塑性理论与构件模型相结合,建立粘弹粘塑性小应变本构模型。为了实现所提出的数值分析模型,用Fortran语言开发了相应的UMAT子程序。将数值模拟结果与已有文献的结果进行比较,验证了本构模型和程序的可靠性。最后,设计了数值算例,进一步分析了小应变参数和粘弹粘塑性参数对软土时间特性的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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