水力发电学报2025，Vol.44Issue(12)：84-99,16.DOI:10.11660/slfdxb.20251208
水位变幅对抽水蓄能面板堆石坝应力变形的影响
Effect of water level variation on stress-deformation behavior of CFRD for pumped storage stations
摘要
Abstract
Accurate prediction of the stress-deformation behavior of a concrete-faced rockfill dam(CFRD)under frequent reservoir stage fluctuations is critical to ensuring the safety of the pumped-storage power station.This study develops an improved constitutive model,GP_WHU,in the framework of the generalized plasticity theory,and demonstrates the application of a corresponding user module.We conduct triaxial tests on representative volume elements(RVE),and use the measurements to validate the model's performance,verifying its capability of effectively capturing the stress-strain response of rockfill materials under triaxial shear,single loading and unloading,and low-frequency multi-cycle loading and unloading conditions.We apply this new model in a case study of an upper reservoir CFRD under construction for a pumped-storage power station in Hezhou,and conduct numerical simulation of dam filling,initial impoundment,and stress-strain response under cyclic reservoir stage fluctuations.Results show the initial impoundment caused significant displacement increment and principal stress direction deviation in the upstream slope area,with the maximum displacement increment occurring at roughly one-third of the dam height from the bottom.And under cyclic hydrodynamic loading,significant cumulative displacement occurred in the dam body near the bottom of the upstream slope in the water level fluctuation zone,and the maximum settlement increment accounted for roughly 3%to 9%of the settlement at the end of construction.As the cycling number increased,both deformation and stress in the dam body and face slabs gradually incresaed but tended to stabilize after around 100 cycles.The study provides key computational support for a full consideration of the effect of frequent reservoir stage fluctuations in the design and operation of CFRD.关键词
面板堆石坝/蓄水过程/频繁水位波动/本构模型/数值模拟Key words
concrete-faced rockfill dam(CFRD)/impounding process/frequent water level fluctuation/constitutive model/numerical simulation分类
建筑与水利引用本文复制引用
HU Jinfang,MA Gang,YANG Qigui,WANG Jingzhou,XIONG Kun..水位变幅对抽水蓄能面板堆石坝应力变形的影响[J].水力发电学报,2025,44(12):84-99,16.基金项目
国家自然科学基金项目(52322907 （）
U23B20149) （）
中国电建科技项目(DJ-ZDXM-2022-01) （DJ-ZDXM-2022-01）
