A constitutive model for Cemented-Sand-Gravel (CSG) materials based on strength characteristics

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials Pub Date : 2025-03-11 DOI:10.1016/j.mechmat.2025.105313

Yingli Wu , Honglei Ren , Wei Li , Peiran Jing , Wanli Guo

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Abstract

As a novel dam type with numerous advantages, the cemented sand and gravel (CSG) dam is increasingly crucial in water conservancy engineering construction. Extensive triaxial shear tests were conducted on specimens with varying confining pressures and gel contents to investigate the intricate mechanical properties of the CSG. Subsequently, a suitable strength criterion and constitutive model for CSG were established. The results indicated that (1) CSG exhibits certain cementation and structural characteristics, displaying significant strain softening, strong shear dilatancy, and other macroscopic mechanical properties. (2) A shear strength criterion based on binary medium theory was developed to describe strength evolution in different gel contents. (3) The shear strength criterion was judiciously transformed into the constitutive model's shear yield surface while considering the material's tensile properties based on the modified Cam-Clay model to obtain the volumetric yield surface. Additionally, the constitutive model focuses on delineating strain softening and strong shear dilatancy of CSG. (4) The stiffness matrix of the constitutive model was derived under general stress conditions with proven good fitting effects during triaxial shear testing of CSG. These findings provide enhanced theoretical guidance for stress-deformation calculations related to CSG dams.

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基于强度特性的水泥砂砾材料本构模型

胶结砂石坝作为一种具有诸多优点的新型坝型，在水利工程建设中发挥着越来越重要的作用。对不同围压和凝胶含量的试样进行了广泛的三轴剪切试验，以研究CSG复杂的力学特性。在此基础上，建立了适用于混凝土混凝土的强度准则和本构模型。结果表明：(1)CSG具有一定的胶结和结构特征，表现出明显的应变软化、强剪切剪胀等宏观力学性能。(2)建立了基于二元介质理论的抗剪强度准则，描述了不同凝胶含量下的强度演化。(3)基于修正的Cam-Clay模型，将抗剪强度准则合理转化为本构模型的抗剪屈服面，同时考虑材料的抗拉性能，得到体积屈服面。此外，本构模型着重刻画了土基的应变软化和强剪胀性。(4)推导了一般应力条件下的本构模型刚度矩阵，经CSG三轴剪切试验证明拟合效果良好。这些发现为CSG坝的应力变形计算提供了理论指导。

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

Mechanics of Materials 工程技术-材料科学：综合

CiteScore

7.60

自引率

5.10%

发文量

243

审稿时长

46 days

期刊介绍： Mechanics of Materials is a forum for original scientific research on the flow, fracture, and general constitutive behavior of geophysical, geotechnical and technological materials, with balanced coverage of advanced technological and natural materials, with balanced coverage of theoretical, experimental, and field investigations. Of special concern are macroscopic predictions based on microscopic models, identification of microscopic structures from limited overall macroscopic data, experimental and field results that lead to fundamental understanding of the behavior of materials, and coordinated experimental and analytical investigations that culminate in theories with predictive quality.