摘要
本文围绕循环蓄水作用下面板堆石坝的变形特性及分析方法展开研究。通过对比广义塑性模型与邓肯-张E-B模型在循环蓄水变形分析中的表现,发现广义塑性模型可有效捕捉堆石体在水循环荷载下的不可逆沉降增量,贴合实际力学行为。研究表明:水循环荷载下堆石体存在可恢复弹性变形与不可恢复永久变形,累积变形随循环次数累积,且变形增量集中于死水位附近,进而导致面板挠度增大。水位循环高度对变形的影响具有空间差异性,竖向沉降随循环高度增加而增大。基于此,坝体分区设计应针对死水位敏感区优化,选用高强度、低压缩性硬岩堆石料,提高粗颗粒含量并严控压实度,以减少水循环荷载下的变形累积,缓解对面板的不利影响。
This study focuses on the research of deformation characteristics and analysis methods of face rockfill dams under cyclic water storage.By comparing the performance of the generalized plastic model and the Duncan-Chang E-B model in the analysis of cyclic water storage deformation,it is found that the generalized plastic model can effectively capture the irreversible settlement increment of rockfill under water cycle loads,which is consistent with the actual mechanical behavior.The research shows that under water cyclic loading,rockfill material has recoverable elastic deformation and irrecoverable permanent deformation;the cumulative deformation accumulates with the number of cycles,and the deformation increment is concentrated near the dead water level,which in turn leads to an increase in face slab deflection.The influence of water level cycle height on deformation has spatial variability,with vertical settlement increasing as the cycle height rises.Based on this,the dam zoning design should be optimized for the dead water level sensitive area:high-strength,low-compressibility hard rockfill materials should be used,with an increased content of coarse particles and strictly controlled compaction degree,to reduce the accumulation of deformation under water cycle loads and alleviate the adverse impact on the face slab.
作者
邹德高
韩沐森
陈楷
张丹
ZOU Degao;HAN Musen;CHEN Kai;ZHANG Dan(State Key Laboratory of Coastal and Offshore Engineering,Dalian Univ.of Technology,Dalian 116024,China;Chengdu Engineering Corporation Limited,Chengdu 610072,China)
出处
《水电与抽水蓄能》
2025年第4期1-6,23,共7页
Hydropower and Pumped Storage
基金
国家自然科学基金项目“土石坝失效模式与致灾机理”(52192674)。
关键词
水位消落
面板堆石坝
本构模型
变形特性
水循环荷载
water level fluctuation
concrete-faced rockfill dam
constitutive model
deformation characteristics
water cyclic loading
