摘要
采用三维静力有限元法,基于邓肯-张E-B非线性弹性模型,模拟计算了双江口高心墙堆石坝的应力与变位。研究了基准参数,高强参数,低强参数,心墙拱效应分析参数与不均匀沉降分析参数对坝体变位与应力的影响。研究结果表明各种参数下坝体变形规律与主应力分布规律一致,但是坝体变形与应力的量值随着不同强度的参数而有差异。坝体沉降在高强参数下取得最小值,比基准参数下的值减小0.147m(约6.34%);在低强参数下取得最大值,比基准参数下的值增大0.2m(约8.62%)。在不同参数计算的结果中,上游堆石区特征点大主应力极大极小值相差0.011MPa,下游堆石区特征点大主应力极大极小值相差0.308MPa,心墙特征点大主应力极大极小值相差1.261MPa,说明心墙应力对于材料参数的敏感性明显高于上下游堆石区应力。
Stresses and displacements of Shuangjiangkou high core-walled dam are computed for the construction stage and impounding stage with a 3D static finite element method based on the Duncan-Chang nonlinear elastic model.These computations are used to study the influences of various material parameters,such as reference parameter,high strength parameter,low strength parameter,arch effect parameters of the core,as well as differential settlement parameters.Results indicate that the distributions of displacement and stresses are roughly similar,but the variations with material parameters are quite different.Under high strength parameter,the maximum settlement shows a minimum of 0.147m or 6.34% less than the reference value.The maximum settlement under low strength parameter is 0.2m or 8.62% more than the reference value.Within the parameter ranges studied,the variations of first principal stress of upper rock-fill and downstream rock-fill are 0.011MPa and 0.308MPa respectively.The variation of 1.261MPa in the first principal stress of core wall shows a higher sensitivity to material parameter than that of the rock-fill regions.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第3期159-163,183,共6页
Journal of Hydroelectric Engineering
关键词
水工结构
敏感性分析
有限元法
心墙堆石坝
应力与变位
hydro-structure
sensibility analysis
finite element method
core-walled rock-fill dam
stress and displacement
