温度对三峡枢纽泄洪坝段运行期纵缝开度的影响研究  

Research on temperature influence of longitudinal joint opening during operation period for Three Gorges Project spillway dam section

作　　者：覃茜 苏海东[1,2] 崔建华 颉志强[1,2] QIN Xi;SU Haidong;CUI Jianhua;XIE Zhiqiang(Department of Material and Structure,Yangtze River Scientific Research Institute,Wuhan 430010,China;Research Center on Water Engineering Safety and Disaster Prevention of Ministry of Water Resource,Wuhan 430010,China)

机构地区：[1]长江科学院材料与结构研究所,湖北武汉430010 [2]水利部水工程安全和病害防治工程技术研究中心,湖北武汉430010

出　　处：《水利水电快报》2025年第4期90-97,共8页Express Water Resources & Hydropower Information

基　　金：国家自然科学基金(52009011);湖北省自然科学基金(2021CFB154);武汉市自然科学基金(2023020201020360)。

摘　　要：三峡泄洪坝段共设置3层泄洪孔,结构形式较为复杂。在施工中根据温控需要,泄洪坝段共设置了2条纵缝,纵缝的接触状态与坝体运行期水位和温度边界条件密切相关。为评估坝体的安全运行状态,采用三维有限元模拟泄洪2号坝段,考虑纵缝接触问题进行非线性模拟分析,基于实测纵缝开度和坝体位移数据,研究了在运行期库水位和外界温度同时变化,以及库水位保持不变仅外界温度变化的情况下,纵缝Ⅰ接触情况和坝体应力的变化规律。结果表明:正常运行期,纵缝大部分区域闭合;在运行期水位不变,外界气温变化时,纵缝张开度呈现出周期性变化的趋势;运行期坝体大部分区域的拉应力不大,坝体整体安全。The flood discharge dam section in the Three Gorges Project contains three layers of flood discharge holes,which have a complex structure.Two longitudinal joints were set up according to temperature control requirements during construction.The contact state of the longitudinal joints was closely related to the water level and temperature boundary conditions during the dam's operational period.In order to evaluate the safe operation status of the dam,the three-dimensional finite element method was used to simulate the No.2 spillway dam section,and the contact problem of longitudinal joints was considered for nonlinear analysis.The contact situation of longitudinal seam I and dam stress were studied when the reservoir water level and external temperature simultaneously change during the operation period according to measured longitudinal joint opening and dam displacement data,and the situation where the reservoir water level remained unchanged and only external temperature changed.The results showed that most areas of the longitudinal joint were closed during the operation period.When the water level remained constant and the external temperature changed,the opening degree of the longitudinal joint showed a periodic trend.Moreover,the tensile stress in most areas of the dam was not significant during the operation period,and the overall safety of the dam was ensured.

关 键 词：三峡水利枢纽工程 泄洪坝段 温度条件 纵缝接触 纵缝开度 三维有限元法 

分 类 号：TV315[水利工程—水工结构工程]