基础置换块弹模对溪洛渡拱坝工作特性的影响  

Influence of Elastic Modulus of Replacement Blocks to the Performance Characteristics of the Xiluodu Arch Dam

作　　者：杨志刚[1,2] 李火坤[1] 陈为民[1] 邓彪[3] 

机构地区：[1]南昌大学建筑工程学院,江西南昌330031 [2]江西省水利科学研究院,江西南昌330029 [3]江西省水利规划设计院,江西南昌330029

出　　处：《人民黄河》2012年第11期120-123,共4页Yellow River

基　　金：国家自然科学基金资助项目(50909049);江西省教育厅科技项目(GJJ11341);江西省水利厅科技项目(KT201106)

摘　　要：采用三维有限元模型模拟溪洛渡拱坝,分析仅在自重作用下不同的基础置换块弹模对坝体位移和应力特性的影响。结果表明:基础软弱结构面的存在对坝体的应力、应变影响较大,经过开挖混凝土置换处理后,能够满足地基与大坝的强度稳定要求。对不同置换块弹模变化方案的分析表明,置换块弹模的变化引起坝体的拱梁应力重分布,即坝体的拱作用与梁作用对自重荷载进行重新分配,随着弹模增大,地基变形减小,嵌固能力加强,约束能力加大,拱作用减弱,梁作用加强。结合溪洛渡工程,得到了适合的基础置换块的弹模数值。With the three-dimensional finite element model,this paper researched on the influence of changing the replacement block＇s elastic modulus of the dam foundation to the stress and strain of the Xiluodu arch dam only under the effects of dam body self-weight.The results show that the weak structural planes in the foundation surface have greater effect on the stress and strain of dam.After excavation and replacement of concrete,the plane can be able to meet the requirements of the foundation and dam stability.Viewing from different replacements programs about elastic modulus of blocks,the changes of elastic modulus of blocks can cause stress redistribution in arch beam of dam.That is the effect of arches and beam redistributes the weight load.As the elastic modulus increases,the ground deformation decreases,the consolidation ability strengthens,the constrained capacity increases,the effect of arch weakens and the effect of beam enhances.Analyzing the effect of different replacement block＇s modulus,the variation law of dam body＇s operating characteristics and proper elastic modulus of foundation replacement block of Xiluodu arch dam can be obtained.

关 键 词：地基 置换块弹模 有限元 溪洛渡拱坝 

分 类 号：TV642[水利工程—水利水电工程]