郑州大学学报（工学版）2024，Vol.45Issue(1)：90-97,8.DOI:10.13705/j.issn.1671-6833.2024.01.003
循环荷载下花岗岩动力响应及本构模型
Dynamic Response Law of Granite and Its Constitutive Model with Cyclic Loading
摘要
Abstract
In this paper,the true triaxial testing machine was used to conduct experimental research on granite specimens with size of 100 mm×100 mm×100 mm with cyclic loading,and to explore the dynamic elastic modulus and dynamic damping ratio of granite under different confining pressure,dynamic loading frequency,dynamic stress amplitude,and number of cycle.The changing law of the data was compared and analyzed.The test found that the dynamic elastic modulus of granite increased linearly with the confining pressure,and the dynamic damping ratio decreased linearly with the confining pressure.The growth of dynamic elastic modulus gradually became larger.The dynamic elastic modulus of granite increased exponentially with the dynamic loading frequency,and the dynamic damping ratio increased as a power function with the dynamic loading frequency.At a dynamic load frequency of 20 Hz the internal activity of the rock was more intense,and the frequency had a greater impact on the rock.The dynamic elastic modulus increased as a quadratic function with the dynamic stress amplitude,and the dynamic damping ratio decreased as a power function with the dynamic stress amplitude.The composition of the rock had an influence on the dynamic damping ratio.The improved Duncan-Chang model reflected well the dynamic constitutive relationship of the granite under different actions of the rock.The model obtained in this test could be used as a reference for subsequent inversion of the dynamic properties.关键词
三轴试验/动弹性模量/动阻尼比/改进邓肯-张模型Key words
triaxial test/dynamic elastic modulus/dynamic damping ratio/improved Duncan-Chang model分类
建筑与水利引用本文复制引用
丁小彬,赵君行,董耀俊..循环荷载下花岗岩动力响应及本构模型[J].郑州大学学报（工学版）,2024,45(1):90-97,8.基金项目
国家自然科学基金资助项目(41827807) （41827807）
广东省现代土木工程技术重点实验室项目(2021B1212040003) （2021B1212040003）
