水资源与水工程学报2025，Vol.36Issue(6)：113-121,129,10.DOI:10.11705/j.issn.1672-643X.2025.06.14
碾压混凝土坝渗透溶蚀演化规律及长期性能数值模拟研究
Numerical simulation of seepage-dissolution evolution and long-term performance of RCC dams
摘要
Abstract
Seepage-dissolution develops in roller compacted concrete(RCC)dams during long-term service and impacts the structural performance overtime.To investigate its evolutionary characteristics and influencing mechanism,we established a seepage-dissolution coupling model in COMSOL,considering the non-equilibrium dissolution process of solid-phase calcium driven by seepage flow.The model was then verified by experimental results.To estimate the safe dam service life accurately,we conducted nu-merical simulations on an actual RCC dam project,and proposed a criterion that requires the anti-sliding stability factor of safety to decrease to the code-specified limit value(FOS=3.0).The results indicate that seepage-dissolution is mainly concentrated in the upstream conventional concrete face slab,dam foundation base,and anti-seepage curtain.The drainage pipes and galleries installed inside the dam ef-fectively inhibit the dissolution development of internal RCC by reducing seepage water pressure.During the service period,the dissolution amount of solid-phase calcium increases exponentially with time,lead-ing to significant deterioration of porosity,permeability coefficient,and diffusion coefficient.This further results in a reduction in the dam's self-weight,an increase in total seepage discharge,and a rise in the uplift pressure of the dam foundation.Throughout the seepage-induced dissolution process,the anti-slid-ing stability factor of safety of the RCC dam exhibits an exponential decay.Based on this,the safe dam service life can be quantitatively evaluated,providing a theoretical basis and technical support for the long-term safe operation and life-cycle management of high dams.关键词
碾压混凝土坝/渗透溶蚀/数值模拟/孔隙率/渗透系数/扩散系数/性能劣化/服役年限Key words
roller compacted concrete(RCC)dam/seepage-dissolution/numerical simulation/poros-ity/permeability coefficient/diffusion coefficient/performance deterioration/service life分类
建筑与水利引用本文复制引用
张文兵,李晗晗,李明超,沈振中,陈元晟..碾压混凝土坝渗透溶蚀演化规律及长期性能数值模拟研究[J].水资源与水工程学报,2025,36(6):113-121,129,10.基金项目
国家自然科学基金项目(52409162) （52409162）
中国航海学会青年人才托举工程项目(YESSCIN2024017) （YESSCIN2024017）
上海市"科技创新行动计划"启明星项目(扬帆专项)(23YF141600) （扬帆专项）
