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基于原型监测和数值仿真试验成果,研究了小湾特高拱坝首蓄期坝基变形特性。通过集成和整合理论推导、相关分析、综合过程线对比分析、工程类比、数学模型分析等定性和定量分析手段,形成了一套变形分析和状态评估的方法。首先,运用实测值过程线分析、特征值统计、相关分析等定性半定量方法归纳和总结了坝基的变形特征,找出若干需要重点关注的“疑点”问题。然后,运用相关分析、数学模型分析、成因分析、数值仿真试验等定量方法进行物理解释和机理分析。最后,运用工程类比、模型监控等综合比较的方法,对坝基的变形状态进行评估。分析发现:首蓄期小湾坝基整体向下游和两岸山体方向变形,径向水平位移明显大于切向水平位移,河床坝段径向位移大于岸坡坝段径向位移,变形空间对称性总体较好;拱端切向变形较小,未见重大异常。河床坝基径向变形尽管较大,但变化符合力学规律,当前仍处于可控状态。综合分析认为,小湾特高拱坝经受了1 218m高库水位作用的考验,坝基变形规律总体正常。
Based on the results of prototype monitoring and numerical simulation, the deformation characteristics of Xiaowan UHV arch dam during the first impoundment are studied. Through the integration and integration of theoretical derivation, correlation analysis, comprehensive process line contrast analysis, engineering analogy, mathematical model analysis and other qualitative and quantitative analysis methods, a set of deformation analysis and state evaluation methods have been formed. Firstly, the deformation characteristics of the dam foundation are summarized and summarized by means of qualitative and semi-quantitative methods such as the process of measured value process line analysis, eigenvalue statistics and correlation analysis, so as to find out a number of “doubtful points” problems that require attention. Then, using the quantitative analysis methods such as correlation analysis, mathematical model analysis, genetic analysis and numerical simulation test, the physical interpretation and mechanism analysis are carried out. Finally, using the method of engineering analogy, model monitoring and other comprehensive comparison, the deformation status of dam foundation is evaluated. The analysis shows that the Xiaowan dam foundation in the first impoundment is deformed to the downstream and along the both sides of the bank. The radial horizontal displacement is obviously larger than the tangential horizontal displacement. The radial displacement of the dam bed is greater than that of the bank slope. The overall symmetry of deformation space Good; arch end tangential deformation is small, no major abnormalities. Although the radial deformation of riverbed dam foundation is larger, the change is in accordance with the laws of mechanics and is still under control. Comprehensive analysis shows that Xiaowan UHP arch dam has been subjected to the test of water level of 1 218m high reservoir and the deformation law of dam foundation is generally normal.