寒潮条件对三河口碾压混凝土拱坝温度应力的影响研究  

Impacts of Cold Wave on Temperature Stress of Sanhekou RCC Arch Dam

作　　者：程汉鼎[1] 赵玮[1] 白雪 CHENG Handing;ZHAO Wei;BAI Xue(Shaanxi Province Institute of Water Resource and Electric Power Investigation and Design(Group)Co.,Ltd.,Xi'an,Shaanxi 710001,China)

机构地区：[1]陕西省水利电力勘测设计研究院(集团)有限公司,陕西西安710001

出　　处：《水利与建筑工程学报》2025年第1期192-199,共8页Journal of Water Resources and Architectural Engineering

基　　金：陕西省水利科技计划项目“碾压混凝土大坝温控防裂与施工质量控制系统研究”(2012-30)。

摘　　要：为研究寒潮条件对三河口碾压混凝土拱坝温度应力的影响,基于实测数据反演分析所得热力学参数,采用有限单元法进行坝体在寒潮条件下的应力仿真计算。结果表明:当遭遇1 d降温5℃寒潮时,坝体最大拉应力由2.56 MPa大幅增加到3.74 MPa,拉应力值远超混凝土允许抗拉强度;典型坝段压应力无明显变化,拉应力最大值由1.64 MPa增加到3.41 MPa。通过分析5种不同寒潮历时和降幅对于拱坝应力分布的影响,降温幅度越高、寒潮历时越长,温度应力的最大值越大。To study the influence of cold wave conditions on the temperature stress of the Sanhekou roller-compacted concrete arch dam,based on the thermodynamic parameters obtained from the back analysis of measured data,the finite element method was used to analyze the stress effects on the dam under cold wave weather.The results show that when experiencing a cold wave(temperature decreasing rate of 5℃ per day),the maximum tensile stress of the dam increased from 2.56 MPa to 3.74 MPa.The value of the tensile stress far exceeded the allowable tensile strength of the concrete.There was no significant change in the compressive stress of a typical dam section,and the maximum value of the tensile stress increased from 1.64 MPa to 3.41 MPa.By analyzing the effects of five different cold wave durations and cooling amplitudes on the distribution of stresses in the arch dam,it can be concluded that the maximum value of temperature stress increases with both higher cooling amplitude and longer the cold wave duration.

关 键 词：寒潮 碾压混凝土拱坝 三河口 温度应力 影响研究 

分 类 号：TV642.2[水利工程—水利水电工程]