混凝土大坝变形监控指标拟定的混合法  

Hybrid method for deformation monitoring index of concrete dam

作　　者：徐小枫 黄耀英[1] 朱赵辉[2] 李新[3] XU Xiaofeng;HUANG Yaoying;ZHU Zhaohui;LI Xin(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,China;China Institude of Water Resources and Hydropower Research,Beijing 100038,China;Xinjiang Irtysh River Basin Development Project Construction and Management Bureau,Urumqi 830000,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]中国水利水电科学研究院,北京100038 [3]新疆额尔齐斯河流域开发工程建设管理局,新疆乌鲁木齐830000

出　　处：《中国水利水电科学研究院学报（中英文）》2022年第4期334-342,共9页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家重点研发计划项目(2018YFC0407103);国家自然科学基金项目(51779130);流域水循环模拟与调控国家重点实验室开放基金项目(IWHR-SKL-201917)。

摘　　要：针对混凝土坝变形监控指标拟定涉及的材料参数众多且不容易准确获取的问题,考虑到水压分量数值计算涉及的参数相对较少且计算结果相对可靠,采用数值计算-变形统计模型的混合法拟定混凝土坝变形监控指标,即水压分量采用不利水位工况下数值计算值,其它分量则采用不利工况下变形统计模型的分离值或反映非线性效应的分量值,结合某常态混凝土高拱坝,提出了基于混合法拟定混凝土坝变形一级、二级监控指标。分析表明,基于混合法拟定的变形一级监控指标与典型小概率法拟定的监控指标接近但略大,这表明该拱坝目前处于黏弹性工作性态,但混合法拟定的变形一级监控指标考虑的因素更全面,而且材料性能分项系数的引入明确了强度参数的合理取值。When the numerical computation method is adopted to determine the deformation monitoring in⁃dex of concrete dam,there exits great difficulties due to many material parameters of dam concrete and rock foundation and these parameters are not easy to obtain accurately.Since the numerical calculation of hydraulic pressure component involves relatively few parameters and the calculation results are relatively reli⁃able,the hybrid method of numerical computation method and statistical model of deformation is employed to determine the deformation monitoring index.Namely,the hydraulic pressure component is calculated by nu⁃merical computation method under the unfavorable water level loadcase,and the other components are ob⁃tained by using the separated values of statistical model or monitoring values reflecting nonlinear effects.Combined with a normal concrete high arch dam,the first-and second-level deformation monitoring index⁃es of concrete dam are analyzed.The research results show that the monitoring index based on the typical low probability method is close to but slightly smaller than the first-level deformation monitoring index based on the hybrid method,which indicates that the arch dam is in viscoelastic working state at present.However,the first-level deformation monitoring index determined by the hybrid method takes into account more comprehensive factors,and the introduction of component coefficient of material properties can present more reasonable value of strength parameters.

关 键 词：混凝土坝 变形监控指标 数值计算法 变形统计模型 混合法 

分 类 号：TV642[水利工程—水利水电工程]