人民长江2025，Vol.56Issue(6)：191-197,7.DOI:10.16232/j.cnki.1001-4179.2025.06.025
改良膨胀土动力特性试验研究
Experimental study on dynamic characteristics of improved expansive soil
摘要
Abstract
To study the dynamic characteristics of improved expansive soil under cyclic loading,we used the dynamic triaxial apparatus to investigate the influence of confining pressure,dynamic stress level,loading frequency and loading mode on the cu-mulative plastic strain,stress-strain hysteretic curve and dynamic modulus of improved expansive soil.The experimental results indicated that the cumulative plastic strain increased with the increase of dynamic stress level,and decreased with the increase of confining pressure or loading frequency.As the dynamic stress level increased,the cumulative plastic strain state of the improved expansive soil changed from stable to collapse.Areas of hysteretic curves decreased with the increase of the number of cycles,and the hysteresis curve tilted closed to the stress axis,resulting in the hardening phenomenon.The dynamic modulus increased with the increase of dynamic strain.The dynamic modulus corresponding to the same dynamic strain was positively correlated with con-fining pressure,dynamic stress level,and loading frequency.Compared to single-stage loading,the multi-stage loading played an active role in improving the ability of the specimens to resist permanent deformation.According to the research results,confi-ning pressure,dynamic stress level,loading frequency,and loading mode have a significant impact on the dynamic characteristics of improved expansive soil.The research results have reference values for understanding and evaluating the dynamic characteristics of improved expansive soil.关键词
改良膨胀土/动三轴试验/累积塑性应变/应力-应变滞回曲线/动弹性模量Key words
improved expansive soil/dynamic triaxial test/cumulative plastic strain/stress-strain hysteretic curve/dynamic modulus分类
建筑与水利引用本文复制引用
李丽华,李泽升,梅利芳,张驰,刘刚..改良膨胀土动力特性试验研究[J].人民长江,2025,56(6):191-197,7.基金项目
国家自然科学基金项目(52278347) （52278347）
湖北省基金创新群体项目(2024AFA009) （2024AFA009）
湖北工业大学杰出人才基金项目(XJ2021000501) （XJ2021000501）
