木浪河拱坝加高培厚三维有限元分析  

Three-dimensional finite element analysis of Mulang River arch dam after heightening and thickening

作　　者：刘俊林[1,2] 何蕴龙[1] 罗代明 刘斌[4] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]广东粤港供水有限公司,广东深圳518021 [3]贵州省水利水电勘测设计研究院,贵州贵阳550001 [4]水利部农村电气化研究所,浙江杭州310000

出　　处：《武汉大学学报（工学版）》2011年第6期701-706,共6页Engineering Journal of Wuhan University

摘　　要：木浪河拱坝加高工程为拱坝加高培厚成折线型重力坝,坝体加高幅度大、结构受力复杂.采用有限元分析软件ADINA的非线性接触功能模拟新老坝体的接触关系,对新老坝体结构在各种工况下的应力变形状况进行仿真分析,计算结果表明:在正常蓄水位工况下,加高培厚后的坝体能够较好地整体工作,新老坝体接触面没有脱开,但有较大范围的粘结滑移;新老坝体位移等值线分布存在明显差异,在新坝体与老坝体坝顶附近接触的部位由于新坝体的向下滑移受到约束而产生竖直向拉应力.在正常蓄水位回降至死水位工况,原拱坝下游面与新坝体上游接触面存在大面积的脱开区,但脱开度基本在4mm以内,可通过加密锚筋减小脱开区;在该工况下,原拱坝坝顶上部的新坝体则因结合面的错动而出现顺河向的水平拉应力.The Mulang River arch dam is heightened to be a gravity dam with a broken line dam axis,being raised by a large margin with a complex structure and stress state.The nonlinear contact function of FEM software ADINA was adopted to simulate the contact between the old and new dams.The stress and deformation were analyzed in various conditions.The results show that under the normal pool level,there is no gap between the old and new dams while a large range of the interface sliding,the difference in deformation between the old and new dams is obvious and tensile stress in the vertical direction is found in the new dam body nearby the old arch dam crest because the downward sliding of the new dam is restrained.Under the normal water level drawdown to the dead water level,large area of the gap is found in the interface between the downstream of the old dam and the upstream of the new one while the gap was generally less than 4 mm and can be avoided by denser anchorage.And under this condition,the transverse tensile stress which caused by the separation of the old and new dams is found in the new dam just upon the old dam crest.

关 键 词：拱坝 加高 重力坝 应力 变形 接触面 

分 类 号：TV642.4[水利工程—水利水电工程]