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本文旨在论述流溪河拱壩工程在设计中一些主要问题。拱壩最大壩高82公尺,壩顶弧长255.5公尺,位于一V形山谷中。壩体大不同半径和厚度拱壩并采用壩顶溢流形式。工程设计及施工已接近完成。本文首先探讨了拱壩壩头岩基具有节理和裂隙时在不同荷载下的稳定问题。推荐了决定系数的方法和公式。其后就现有的拱壩各种放力分析方法进行了论述并认力悬臂拱法(或称试载法)较为适用。本文对于试载法提出了改进步骤,利用这些改进步骤并借用一定数量的基础和拱圈变形常数表则计算应力分析和包括基础变形的圆拱变位可大大简化并无损其精度。在分析中所需数表将另著文介绍。控制拱壩温度和确定温度应力问题在拱壩设计和施工中也极关重要。本文论述了温度控制的各种原理和计算方法,并描述了本工程所采用的措施。对于拱壩温度应力的分析原理曾加论述。最后曾就拱壩壩顶溢流问题加以简述。有关此项新颖问题的设计,需待进一步研究并进行模型试验。
This article aims to discuss some of the major issues in the design of the Liuxihe Arch Dam project. Arch Dam The maximum height of 82 meters, the crest of arc 255.5 meters, located in a V-shaped valley. Dam body with different radius and thickness of the dam and the use of dam overflow form. Engineering design and construction is almost completed. In this paper, the stability of arch dam foundation with rock joints under different loads is discussed. Recommended methods and formulas for determining coefficients. Afterwards, the existing arch dam various force analysis methods are discussed and cantilevered arch method (or load test method) is more applicable. In this paper, some improvement steps are put forward for the trial loading method. With these improvement steps and using a certain number of foundation and crown deformation constants tables, the stress analysis and the dome deformation including the basic deformation can be greatly simplified without loss of accuracy. The required number of tables in the analysis will be presented in addition. Control arch dam temperature and temperature stress problems in the design and construction of the dam is also very important. This paper discusses various principles and calculation methods of temperature control and describes the measures adopted in this project. For the arch dam temperature stress analysis principle has been discussed. Finally, the problem of overflow at the arch dam was briefly described. The design of this novel issue requires further study and model testing.