高拱坝施工期未封拱坝段悬臂挡水可行性分析  

Feasibility Analysis of Cantilever Retaining Water in Unsealed Arch Dam Section during Construction of High Arch Dam

作　　者：宋勇科 唐晋 金俊超 Song Yongke;Tang Jin;Jin Junchao(Xiping County Water Conservancy Bureau,Zhumadian 463900,China;Yellow River Investigation,Planning,Design and Research Institute Ltd.,Zhengzhou 450003,China)

机构地区：[1]西平县水利局,河南驻马店463900 [2]黄河勘测规划设计研究院有限公司,郑州450003

出　　处：《黑龙江水利科技》2024年第12期39-42,共4页Heilongjiang Hydraulic Science and Technology

基　　金：中国博士后科学基金(2022M721299);河南省科技攻关项目(232102320339)。

摘　　要：以某在建高拱坝为例,应用非线性有限元方法,采用接触模拟坝体横缝,进行了大坝汛前、汛期及汛后挡水全过程模拟,分析了施工期未封拱坝段悬臂挡水的可行性。计算结果表明,汛期高水位作用下,坝体顺河向变形由向上游转变为向下游;坝体主拉应力总体<0.5MPa,基本满足规范要求;整个坝体只在应力集中部位发生了塑性屈服,坝体具有良好的稳定性;横缝开度在汛期最大减小了2.46mm,但水荷载释放后横缝开度基本上能恢复原状。仿真计算结果为高拱坝施工期采用悬臂挡水设计提供了科学依据。Taking a high arch dam under construction as an example,the whole process of retaining water before flood,during flood and after flood is simulated by using the nonlinear finite element method and the contact simulation of the transverse joint of the dam body,the feasibility of cantilever retaining water in unsealed arch dam during construction period is analyzed in this paper.The calculation results show that under the action of high water level in flood season,the deformation of the dam body changes from upstream to downstream.The main tensile stress of the dam body is less than 0.5MPa,which basically meets the requirements of the code.The whole dam body has good stability because the plastic yield occurs only in the stress concentrated part,and the dam body has good stability.The transverse joint opening decreased by 2.46mm in flood season,but the transverse joint opening basically recovered after the water load was released.The simulation results provide a scientific basis for the cantilever water retaining design of high arch dam during construction.

关 键 词：高拱坝 悬臂挡水 横缝开度 数值仿真 

分 类 号：TV642.4[水利工程—水利水电工程]