岩土工程学报2024，Vol.46Issue(10)：2089-2100,12.DOI:10.11779/CJGE20230644
堆石料本构模型对混凝土面板坝应力变形计算结果的影响研究
Influences of constitutive model for rockfill materials on calculated stress and deformation of concrete-faced dams
摘要
Abstract
Choice of constitutive model for rockfill materials is the most influencing factor that affects the computed stress and deformation results of concrete-faced dams(CFD).In this study,the Duncan's E-B(EB)nonlinear elastic model and the Nanshui(NS)double-yield surface elastoplastic model are used for rockfill materials to simulate the construction and impounding processes of a typical CFD by using three-dimensional finite element method.The differences in the displacement and stress of rockfill zones and concrete slabs are compared,and the reasons were analyzed.Two most important differences are found.First,the displacement quantities such as the dam settlement and slab deflection predicted by the NS model are smaller than those obtained by the EB model,and this difference can be attributed to the higher minor principal stresses and therefore higher deformation moduli within rockfill zones by the former.Second,the EB model predicts a tensile zone along the upstream slope near the bottom of face slabs,while the results by the NS model shows that the slope stresses of face slabs are completely compressive.The tensile stress predicted by the EB model is due to its isotropic elasticity nature,i.e.,the cushion materials expand along the slope under the huge hydrostatic pressure,leading to a displacement upward towards the dam crest.The NS model,on the other hand,predicts an additional plastic volume contraction within the upstream rockfill zones due to the expansion of F1 yield surface,which completely counteracts the elastic expansion along the slope and results in a downward displacement of the cushion layer.关键词
混凝土面板坝/堆石料/本构模型/应力变形Key words
concrete-faced dam/rockfill material/constitutive model/stress and deformation分类
土木建筑引用本文复制引用
傅中志,张意江,陈锦祎,王永生..堆石料本构模型对混凝土面板坝应力变形计算结果的影响研究[J].岩土工程学报,2024,46(10):2089-2100,12.基金项目
国家自然科学基金项目(52222906,U21A20158) （52222906,U21A20158）
国家重点研发计划项目(2021YFC3090101) （2021YFC3090101）
