工程地质学报2017，Vol.25Issue(4)：975-984,10.DOI:10.13544/j.cnki.jeg.2017.04.011
长期循环荷载下人工结构性软土累积变形规律及预测模型
CHANGE LAW AND PREDICTION MODEL FOR ACCUMULATIVE DEFORMATION OF ARTIFICIAL STRUCTURED SOFT SOIL UNDER LONG-TERM CYCLIC LOADING
摘要
Abstract
This paper addresses the long-term settlement of embankment induced by the traffic loading and soil structure of natural soft clay.The artificial structured soils with different bonding strength are prepared.A series of compression test and dynamic triaxial tests are carried out to investigate the effects of cycle number,dynamic stress ratio and structured strength on the accumulative deformation behavior.The results indicate that accumulative deformation increases with the increase of cycle number and dynamic stress ratio,and decreases with the increase of structured strength.Three curve categories can be distinguished to describe relationships between accumulative plastic strain and cycle number.They are destructive,stable and critical types.Considering the impact of soil structure,a structured parameter called stress sensitivity Sσ is introduced into existing accumulated deformation prediction model.Then destructive and stable empirical formulas are established.They can better predict various accumulative strain curves of structured soft soils with different deformation conditions.The variation of model parameters with the stress level and structure strength is also analyzed.关键词
长期循环荷载/结构性/累积变形/应力灵敏度/预测模型Key words
Long-term cyclic loading/Soil structure/Accumulative deformation/Stress sensitivity/Prediction model分类
建筑与水利引用本文复制引用
瞿帅,刘维正,聂志红..长期循环荷载下人工结构性软土累积变形规律及预测模型[J].工程地质学报,2017,25(4):975-984,10.基金项目
国家自然科学基金项目(51208517),中国博士后科学基金项目(2013M530360),中南大学中央高校基本科研业务费专项资金项目(2016zzts390)资助. （51208517）
