中南大学学报（自然科学版）2025，Vol.56Issue(5)：2005-2016,12.DOI:10.11817/j.issn.1672-7207.2025.05.026
干湿循环下固化盾构渣土蠕变特性及模型研究
Study on creep characteristics and model of solidified shield muck during dry and wet cycling
摘要
Abstract
In order to investigate the effect of drying and wetting cycles on the creep characteristics of solidified shield muck used as subgrade filler,Nanjing subway shield muck was modified by a new green polymer composite curing agent.One-dimensional creep tests were carried out on solidified shield muck in different drying and wetting cycles.The test results show that the creep properties of solidified shield muck are enhanced with the increase of drying and wetting cycles,and the creep time increases.The internal structure of solidified shield muck has mutant damage after the first drying and wetting cycle.The maximum creep rate increase amplitude of soil sample in the constant velocity creep stage can reach 52.11%,which is significantly higher than that of the subsequent drying and wetting cycles.The relationship between stress and strain of solidified shield muck is nonlinear.With the increase of the number of drying and wetting cycles,the nonlinear characteristics become more obvious.There exists structural yield stress in solidified shield muck,and the stress decreases with the increase of drying and wetting cycles.After cycles of 0,1,3,5,7,9 times,it is divided into 327,309,302,289,281,275 kPa.Based on the experimental results,a nonlinear four-element creep model is established by introducing time-dependent nonlinear viscous elements,which can reflect the creep characteristics of solidified shield muck.关键词
路基工程/固化盾构渣土/蠕变特性/干湿循环/蠕变模型Key words
subgrade engineering/solidified shield muck/creep property/drying and wetting cycles/creep model分类
土木建筑引用本文复制引用
顾琳琳,肖天驰,王振,张锋,凌贤长..干湿循环下固化盾构渣土蠕变特性及模型研究[J].中南大学学报（自然科学版）,2025,56(5):2005-2016,12.基金项目
中央高校基本科研业务费专项资金资助项目(30924010840)(Project(30924010840)supported by the Fundamental Research Funds for the Central Universities) （30924010840）
