中南大学学报（自然科学版）2026，Vol.57Issue(4)：1676-1692,17.DOI:10.11817/j.issn.1672-7207.2026.04.018
膨胀力驱动下硬黏土崩解机制研究——基于裂隙演变的试验分析
Disintegration mechanism of stiff clay driven by swelling pressure:experimental analysis based on cracking evolution
摘要
Abstract
To investigate the evolution of disintegration behavior of remolded stiff clay under different swelling pressure conditions,expansive stiff clay samples with varying montmorillonite content and initial water content were prepared.The wetting process of samples was monitored throughout using a self-designed disintegration apparatus,and vertical swelling pressure was measured under constant volume conditions using a swelling permeameter.The results indicate that,at a given initial water content,increasing montmorillonite content enhances swelling pressure,amplifies expansion gradient during water infiltration,and promotes internal propagation of hydration cracks,accelerating disintegration.At a given montmorillonite content,higher initial water content reduces swelling pressure and permeability,lowers water infiltration,suppressing formation of heterogeneous expansion,and decreases disintegration rate.During hydration,the swelling potential and infiltration rate jointly control the formation of expansion gradient.The resulting tensile stresses induce hydration cracks,which compromise soil structural integrity and facilitate disintegration.Meanwhile,local disintegration provides preferential water infiltration channels to accelerate further soil expansion and hydration cracking until the completion of sample disintegration.Higher swelling pressure and lower initial water content both exacerbate disintegration of stiff clay.Engineering measures,such as optimizing soil composition and controlling water infiltration,can suppress swelling strain gradients and improve stability of expansive stiff clay.关键词
膨胀硬黏土/崩解/膨胀力/蒙脱石掺量/初始含水率/裂隙演化Key words
expansive stiff clay/disintegration/swelling pressure/montmorillonite content/initial water content/crack evolution分类
建筑与水利引用本文复制引用
周耘,王琼,苏薇,贺勇,叶为民,陈永贵,陈盛金..膨胀力驱动下硬黏土崩解机制研究——基于裂隙演变的试验分析[J].中南大学学报（自然科学版）,2026,57(4):1676-1692,17.基金项目
国家自然科学基金资助项目(42172298,42002289) （42172298,42002289）
国家重点研发计划项目(2019YFC1509900) （2019YFC1509900）
中央高校基本科研业务费资助项目(22120250424) （22120250424）
中国博士后科学基金面上资助项目(2022M722428)(Projects(42172298,42002289)supported by the National Natural Science Foundation of China （2022M722428）
Project(2019YFC1509900)supported by the National Key R&D Program of China （2019YFC1509900）
Project(22120250424)supported by the Fundamental Research Funds for the Central Universities （22120250424）
Project(2022M722428)supported by the China Postdoctoral Science Foundation) （2022M722428）
