{"title":"A constitutive model for cemented granular materials capturing bond degradation","authors":"Zhibin Luo , David Airey , Yong Fu","doi":"10.1016/j.compgeo.2024.106716","DOIUrl":null,"url":null,"abstract":"<div><p>A constitutive model for cemented granular materials based on modified Cam-clay model has been developed. The model is capable of predicting the stress–strain response of cemented granular materials subject to mechanical and chemical bond degradation. Two simple variables, the void ratio <em>e</em> and cement content <em>C<sub>c</sub></em> are used to evaluate the mechanical and chemical degradation ‘history’ of cemented granular materials. Simulation results show the effect of confining pressure, and the change from strain softening to hardening behaviour can be successfully reproduced. Moreover, the model also reproduces the changes of mechanical properties such as strength, bulk modulus and shear modulus due to the increase of void ratio and degradation of bond strength caused by chemical dissolution. Comparisons with experimental data show that the model can capture the stress–strain response of cemented geomaterials subjected to chemical degradation at different stress levels.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106716"},"PeriodicalIF":6.2000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computers and Geotechnics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0266352X24006554","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS","Score":null,"Total":0}
引用次数: 0
Abstract
A constitutive model for cemented granular materials based on modified Cam-clay model has been developed. The model is capable of predicting the stress–strain response of cemented granular materials subject to mechanical and chemical bond degradation. Two simple variables, the void ratio e and cement content Cc are used to evaluate the mechanical and chemical degradation ‘history’ of cemented granular materials. Simulation results show the effect of confining pressure, and the change from strain softening to hardening behaviour can be successfully reproduced. Moreover, the model also reproduces the changes of mechanical properties such as strength, bulk modulus and shear modulus due to the increase of void ratio and degradation of bond strength caused by chemical dissolution. Comparisons with experimental data show that the model can capture the stress–strain response of cemented geomaterials subjected to chemical degradation at different stress levels.
基于修正的卡姆-粘土模型，开发了一种胶结颗粒材料的构成模型。该模型能够预测受机械和化学键降解影响的胶结颗粒材料的应力-应变响应。空隙率 e 和水泥含量 Cc 这两个简单变量用于评估胶结颗粒材料的机械和化学降解 "历史"。模拟结果表明，约束压力的影响以及从应变软化到硬化的行为变化都能成功再现。此外，该模型还再现了由于空隙率增加和化学溶解导致粘结强度下降而引起的强度、体积模量和剪切模量等力学性能的变化。与实验数据的比较表明，该模型可以捕捉到在不同应力水平下受化学降解影响的胶结土工材料的应力-应变响应。
期刊介绍：
The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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