| With the rapid development of dam construction technology in my country,the number of high dams and reservoirs has increased sharply,and the height is getting higher and higher,even exceeding the existing design specifications.Arch dams are favored for their thin thickness and good integrity.The safety of the dam is the focus of the current dam industry;at the same time,the construction period and the initial stage of impoundment are the frequent periods of dam failures or accidents.The structural behavior during the construction period directly affects the structural behavior during the operation period,and ultimately affects the project.Structural safety.Therefore,it is of great significance to effectively monitor the stress state of the super high arch dam during the construction period and ensure the safe construction of the super high arch dam.This article is funded by the National Natural Science Foundation of China "Research on Numerical Analysis of Long-term Deformation Characteristics and Safety Monitoring Methods of Concrete Dams"(NO.51769017)and "Research on Temporal and Spatial Analysis Methods of Deformation Forms of Ultra-High Arch Dams"(NO.51969018),“Research on stress monitoring model during construction period of super high arch dam considering water storage in advance” was carried out.In view of unconventional loads such as accidental loads and unfavorable load combinations that may be experienced by super high arch dams,considering the condition of impounding water in advance during the construction period,comprehensive use of mathematics,mechanics,and dam engineering theories and methods are based on the construction period of super high arch dams.Stress-strain prototype monitoring data and panel data analysis methods,exploring the evolution law of stress in ultra-high arch dams,and constructing a stress monitoring model for ultra-high arch dams during construction that considers water storage in advance,providing guidance for the design and construction of ultra-high arch dams And decision-making.The main research contents are as follows:(1)Considering the influence of water impounding and arch sealing grouting in advance of the super high arch dam during the construction period on the stress of the dam body,the mathematical expressions of the self-weight factor of the unsealed arch stage and the lower arch impounding and the upper continuous pouring concrete are deduced,based on the flow Based on the variable mechanics theory,the expression of the time-effect component of the super high arch concrete arch dam during the construction period is deduced.Based on the dam safety monitoring theory,a statistical model of stress monitoring during the construction period of the super high arch dam considering the impoundment in advance is further constructed.(2)Using the related information and dynamic change information of different parts of the dam,and deeply excavating the time dimension and spatial structure in the monitoring information of the measuring points,applying the panel data theory,the stress variable intercept during the construction period of the super high arch dam was established Panel model: The Hausman test method is used to test the peculiar effect amount in the panel data,and the stress time-space analysis model of the ultra-high arch dam during the construction period considering the water storage in advance is constructed.(3)Based on the panel clustering theory method,the similarity index criterion of the stress measurement points of the super high arch dam is proposed,and the stress of the super high arch dam is divided by the entropy weight method,and the water storage in advance during the construction period of the super high arch dam is explored The stress evolution law under working conditions is based on the stress division of ultra-high arch dams,further searching for the most dangerous areas and combining with the typical small probability method to draw up stress warning indicators. |
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