水资源与水工程学报2017，Vol.28Issue(4)：223-228,6.DOI:10.11705/j.issn.1672-643X.2017.04.38
循环荷载作用下重塑饱和粉黏土的刚度弱化特性研究
The stiffness weakening characteristics of remolded saturated powder clay under cyclic loading
陈坚 1任青 1喻孟初 1石登登1
作者信息
- 1. 上海理工大学 环境与建筑学院, 上海 200093
- 折叠
摘要
Abstract
Based on the background of the Donghai Bridge offshore wind farm project, a series of long-term undrained cyclic loading triaxial tests were carried out on the reconstructed saturated silty clay through the dynamic triaxial system.Considering the confining pressure, dynamic stress ratio and frequency, the dynamic weakening characteristics of powder clay under high frequency (f>5 Hz) were studied.The results show that the cumulative plastic strain and cumulative pore pressure increase with the increase of thecycles and tend to be stable, which shows the strain softening and the pore pressure softening.The secant dynamic deformation modulus and the secant dynamic elastic stiffness modulus first decrease sharply with the increase of the cycles, and then become stabilized, which shows the weakening of stiffness.We further discusses the relationship between the secant dynamic elastic stiffness modulus and cyclic strain amplitude, and the dynamic stress ratio and the frequency has little influence on the attenuation trend of secant dynamic elastic stiffness modulus, but the confining pressure has great influence.The higher the confining pressure is, the more slowly the secant dynamic elastic stiffness modulus decay and the lower attenuation stable amplitude is.关键词
循环荷载/重塑饱和粉黏土/动三轴试验/高频/刚度弱化特性Key words
cyclic loading/remolded saturated powder clay/dynamic triaxial test/high frequency/stiffness weaken characteristics分类
建筑与水利引用本文复制引用
陈坚,任青,喻孟初,石登登..循环荷载作用下重塑饱和粉黏土的刚度弱化特性研究[J].水资源与水工程学报,2017,28(4):223-228,6.
