碾压混凝土重力坝静动力分析

Static and Dynamic Analysis of RCC Gravity Dam

碾压混凝土坝受施工影响 ,常在混凝土碾压层间出现结合面夹层 ,影响坝体变形及内应力分布 .应用等效模量理论 ,把层状体结构转换为横观各向同性体进行应力和位移计算 ,根据Aboudi公式预测弹性参数 ,结合龙滩碾压混凝土重力坝 ,采用有限元法分析了碾压混凝土的横观各向同性性质对坝体应力分布和动力特性的影响 .结果表明 :对比各向同性体模型 ,碾压混凝土重力坝采用横观各向同性体模型 ,计算的坝基面的坝踵及坝趾处应力集中程度变化明显 ,坝体位移相对各向同性体计算的位移偏大 ;进行碾压混凝土坝的静动力分析时 。

Due to construction conditions,RCC (roller compacted concrete) dam often occurs weak intercalated layer defects,which may lead to changes in the distributions of stress and displacement in the structure.In order to ascertain the stress and displacement state in the layered dam structure, a multilayered element can be transformed to a transversely isotropic one based on the modulus equivalent principle.Aboudi formula is used to calculate the parameters of elasticity.Taking Longtan dam as an example,the effect of the transversely isotropy of RCC on the stress distribution and dynamic characteristics is analyzed by using finite element method.By comparing the transversely isotropic model with the isotropic model,the results show that stress concentration degrees of dam heel and dam toe on thesurface of RCC gravity dam foundation change obviously,and the displacement of dam body becomes larger.This paper gives a simple and feasible method which simplifies a multilayered structure to a transversely isotropic one on the research of static and dynamic analysis of RCC gravity dam.