单调循环加载下胶结砂的欠塑性模型

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL

Canadian Geotechnical Journal Pub Date : 2023-10-24 DOI:10.1139/cgj-2023-0079

Dong Liao, Zhongxuan Yang, Shun Wang, Wei Wu

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引用次数: 0

摘要

在本研究中，建立了一个低塑性模型来描述胶结砂在单调和循环加载条件下的力学行为。提出了一个状态变量来限定键合强度。将该变量纳入模型中，以反映胶结对砂土强度、刚度和剪胀性的影响。通过允许状态变量在变形过程中演变来考虑粘结退化。对于大变形，采用一种简单的演化方法，结合强度消失。临界状态下的孔隙比和摩擦角与初始胶结有关。该模型随后扩展到考虑循环加载，包括晶间应变、织物变化效应和半流化状态。通过模拟单调加载和循环加载条件下胶结砂的特性，验证了该模型的有效性。

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A hypoplastic model for cemented sand under monotonic and cyclic loading

In this study, a hypoplastic model is developed to describe the mechanical behaviors of cemented sand under both monotonic and cyclic loading conditions. A state variable is proposed to qualify the bonding strength. This variable is incorporated into the model to reflect the influence of cementation on the strength, stiffness, and dilatancy of sand. Bonding degradation is considered by allowing the state variable to evolve during deformation. A simple evolution is used with vanishing bonding strength for large deformation. The void ratio and friction angle in the critical state are related to the initial cementation. The model is subsequently extended to account for cyclic loading by incorporating the intergranular strain, fabric change effect, and semifluidized state. The capability of the model is demonstrated by simulating the behavior of cemented sand under both monotonic and cyclic loading conditions.

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来源期刊

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.