考虑应力路径效应的堆石料剪胀方程研究
Dilatancy equation for rockfill materials considering stress path effect
赵勇博 1张振东 2卞士海 3史文龙2
作者信息
- 1. 宁波工程学院 建筑与交通工程学院,浙江 宁波 315000
- 2. 辽宁工程技术大学 土木工程学院,辽宁 阜新 123000
- 3. 浙江省工程勘察设计院集团有限公司,浙江 宁波 315012;水利部水库大坝安全重点实验室,江苏 南京 210029
- 折叠
摘要
为揭示堆石料应力路径和剪胀特性相互影响机理,分析了等向压缩试验、常规三轴试验以及等p试验之间的应力应变响应关系.采用理论分析和试验验证的方法,在弹塑性本构模型框架下,提出一种新的考虑应力路径效应的剪胀方程构建方法,并通过多种应力路径堆石料三轴试验对新的剪胀方程进行验证.预测结果表明:构建的剪胀方程可以考虑应力路径的影响,尤其是等应力比加载路径的影响.研究结论揭示了等向压缩试验和等p试验的重要性,建议在建立考虑应力路径影响的剪胀方程和本构模型时利用这两类试验.
Abstract
This paper aims to reveal the inherent interaction mechanism between stress path and dilatancy equation for rockfill materials.The stress-strain response relationships among isotropic compression tests,conventional triaxial tests,and constant p test is analyzed.By employing theoretical analysis and experimental verification methods,a new method for constructing dilatancy equation is proposed within the framework of an elastoplastic constitutive model and was validated through triaxial tests of rockfill materials under various stress paths.The prediction results show that the proposed dilatancy equation can capture stress path effect,especially the effect for constant stress ratio loading paths.The conclusion reveals the importance of isotropic compression tests and constant p-tests.It is suggested to use these two types of tests when establishing dilatancy equation and constitutive model that consider stress path effect.
关键词
堆石料/应力路径/剪胀方程/等向压缩试验/等p试验/模型验证Key words
rockfill materials/stress path/dilatancy equation/isotropic compression test/constant p test/model validation引用本文复制引用
基金项目
国家重点研发计划资助项目(2018YFC1508503)
水利部水库大坝安全重点实验室开放基金项目(YK321011)
出版年
2024
国家科技期刊平台
NSTL
万方数据