摘要
【目的】为研究龙羊峡重力拱坝坝体水平位移与库水位变化之间存在的“相位差”并与一般混凝土坝位移随水位同步变化的规律进行对比,【方法】首先结合水压和温度对重力拱坝变形的作用机理,对存在“相位差”的原因进行假设。将龙羊峡重力拱坝的坝体水平位移分为四阶段,分析各阶段位移增量及变形速率,随后建立大坝三维模型,通过定量分析和有限元计算的方法对于上述假设进行验证。【结果】结果显示,对于重力拱坝,其水位及温度对位移均有较大影响。【结论】在无温度应力作用时,坝体径向位移随水位上升而向下游变形,在无水压力作用时,坝体径向位移随温度上升而向上游变形;龙羊峡重力拱坝水平位移一年中的变形主要分为四个阶段,水压和温度在各个阶段发挥着不同的作用,使各个阶段的变形速率不同,二者的综合作用导致了龙羊峡重力拱坝水平位移和库水位变化之间“相位差”的存在。
[Objective]In order to study the phase difference between the horizontal displacement of the Longyangxia Gravity Arch Dam and the change of the reservoir water level and to compare it with the law of the synchronous change of the displacement of the general concrete dam with the water level,the mechanism of the existence of the phase difference is assumed.[Methods]The horizontal displacement of the dam body of the Longyangxia Gravity Arch Dam is divided into four stages,the displacement increment and deformation rate of each stage are analyzed,and then a three-dimensional model of the dam is established,and the above assumptions are verified by quantitative analysis and finite element method.[Results]The result show that for the gravity arch dam,the water level and temperature have a great influence on the displacement;[Conclusion]when there is no temperature stress,the radial displacement of the dam body deforms downstream as the water level rises,and when there is no water pressure,the dam body deforms upstream as the temperature rises;the deformation of the horizontal displacement of the Longyangxia Gravity Arch Dam in one year is mainly divided into four stages,and the water pressure and temperature play different roles in each stage,making the deformation rate of each stage different,the combined effect of the two leads to the existence of the phase difference between the horizontal displacement of the Longyangxia Gravity Arch Dam and the change of the reservoir water level.
作者
周天宇
刘昌伟
乔海山
刘海敏
王进廷
潘坚文
ZHOU Tianyu;LIU Changwei;QIAO Haishan;LIU Haimin;WANG Jinting;PAN Jianwen(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;State Power Investment Corporation Qinghai Yellow River Electric Power Technology Co.,Ltd.,Xining 810016,Qinghai,China)
出处
《水利水电技术（中英文）》
北大核心
2023年第5期75-83,共9页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(52022047,52192672)。
关键词
龙羊峡重力拱坝
水平位移
“相位差”
温度应力
有限元计算
Longyangxia Gravity Arch Dam
horizontal displacement
phase difference
temperature stress
finite element method
