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Numerical Simulation on Temperature and Stress of Roller Compacted Concrete Dam Considering the Mult

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Tutor: QiLan
School: Tianjin University
Course: Hydraulic Structure Engineering
Keywords: hydraulic structure,RCC Dam,Multi-Field coupling,temperature control measures,te
CLC: TV642.2
Type: Master's thesis
Year:  2012
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Abstract:
With roller compacted concrete damming technology development for severaltens of years, not only for its features of rapid and simple construction, but alsoeconomic,make it widely used in water conservancy project. But in the constructionprocess of the dam, dam stress will be affected by some factors, for example concretetemperature rising and impound on construction in later stage of hydraulicengineering, and so on. If we don’t take reasonable measures, that will produce a largedam stress value, and then crack failure will happen, the result is that the stability ofthe dam will be threatened, so how to effectively reduce these unfavorable factors,cause the people more attention. In view of the above questions, this paper considersthe various influencing factor, the main research content is as follows:(1) Using numerical method to simulate the construction process of the dam, inthis process, considering the temperature field, seepage field and stress field of thecoupling relationship between, using direct coupling and indirect coupling methodcombining,. Through calculating the dam stress value under three field coupling, andcomparing with stress value which not considered the one physical field coupling. It isconcluded that in the transient construction process, the temperature field of damstress value influence is bigger, and the seepage field of dam stress is less affected.(2) Select the spillway dam section on a hydropower station model, to simulatethe whole construction process of dam transient temperature. In the calculatingprocess, considering the air temperature, water temperature, the concrete temperaturerising of hydration heat, creep and intermittent period of the concrete and so on.Dueto the high temperature casting will directly affect the dam stress, therefore increasingthe concrete temperature control measures is needed. Based on the simulation of thedam construction process was calculated respectively take temperature controlmeasures and not take temperature control measures of the dam of transienttemperature field. Then through the comparative analysis, we study temperaturecontrol measures cooling effect and the laws of dam temperature changing. Theresults show that: If we don’t use cooling measures, each part of the dam bodytemperature is higher, in the whole construction period dam body internal highesttemperature is more than27℃, increase cooling measures after, dam body parts to reduce the highest temperature8℃or so, temperature control measures play a verygood cooling effect; Water storage and temperature for dam body surface temperatureinfluence depth is larger, the surface at a distance of15m within the scope of the lateconcrete is still under external temperature influence.(3) Take a spillway dam section of hydropower station as an example, to researchthe dam’s stress which is considered temperature control measures, this processsimulates the whole process of the dam concrete pouring construction, and considersthe influence of the creep of concrete, the elastic modulus changing. In this process,the transient temperature result is joined in as a load. The results show that: thesurface of the dam easy to produce large tensile stress, and the impound influences thedam stress value greatly, after the sluicing dam body upstream face tensile stressmaximum growth reached2.57MPa, and maximum stress value happened in the damheel.
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