岩土工程学报2026，Vol.48Issue(6)：1309-1321,13.DOI:10.11779/CJGE20250310
高压实膨润土体变时效特性研究进展
Advances in studies on time-dependent characteristics of volume change for highly compacted bentonite
摘要
Abstract
Highly compacted bentonite is the preferred buffer/backfill material for deep geological disposal of high-level radioactive waste,where its long-term volumetric stability plays an important role in ensuring repository safety.This work provides a comprehensive review of the volumetric deformation mechanisms and time-dependent characteristics of highly compacted bentonite,with a focus on recent progress in microstructural aging due to resting time,creep behavior,and relevant constitutive modeling.Recent studies reveal that prolonged aging time induces microstructural homogenization,diminishing swelling capacity and altering time-dependent deformation.Creep behavior and strain rate effect driven by particle rearrangement,pore water migration,bond breakage,and adsorbed water viscosity are significantly influenced by temperature and suction.Creep models for highly compacted bentonite are mainly based on elasto-viscoplastic theory,with overstress formulations incorporating thermal and hydraulic effects to capture creep and rate-dependent behavior.However,current studies overlook the time-dependent nature of external loads such as chemical conditions,temperature,and suction,limiting their applicability under long-term repository environments.In particular,the long-term impact of saline groundwater infiltration on deformation behavior of bentonite lacks systematic investigation.Future research should target multi-scale creep responses under extended resting and complex CHT conditions to enhance predictive models and repository safety assessments.关键词
深地质处置/高压实膨润土/静置时间/蠕变/时间依赖性/弹黏塑性模型Key words
deep geological disposal/highly compacted bentonite/aging time/creep/time dependence/elastic-viscoplastic model分类
建筑与水利引用本文复制引用
邹一,陈永贵,叶为民,孙曌..高压实膨润土体变时效特性研究进展[J].岩土工程学报,2026,48(6):1309-1321,13.基金项目
国家杰出青年科学基金项目(42125701) （42125701）
国家自然科学基金项目(42430713)This work was supported by National Science Fund for Distinguished Young Scholars(Grant No.42125701),and National Natural Science Foundation of China(Grant No.42430713). （42430713）
