基于库盘变形的高混凝土拱坝变形分析方法研究

Study on analysis method of high concrete arch dam deformation based on reservoir basin deformation

在常规混凝土高拱坝变形性态研究中,对远坝区库盘变形影响考虑不足,导致坝体变形计算结果与监测数值存在差异。通过建立大范围的库盘有限元模型,在研究合理建模范围的基础上,提出了库盘变形作用对坝体变形性态影响的分析方法。以某高混凝土双曲拱坝河床坝段为研究对象,联合库盘有限元模型和近坝区有限元模型模拟了库盘变形对坝体变形的影响。研究结果表明:当库区基岩岩性较差时,高坝大库工程的库盘变形对坝体变形影响明显,而且考虑库盘变形作用而得到的坝体变形值更接近实测资料。

In traditional study of concrete high arch dam deformation state,the influence of reservoir basin deformation far away from dam site is neglected,which causes the difference of the deformation calculation results and monitoring data. Through establishing FEM model for a wide range of reservoir basin,the method to analyze the influence of reservoir basin deformation on dam deformation was put forward in consideration of a reasonable model range. Taking a high concrete arch dam as a research object,a reservoir basin FEM model and a near- dam area FEM model were used jointly to simulate the influence of reservoir basin on dam body deformation. The research results show that when the reservoir bedrock lithology is poor,the influence of reservoir basin deformation of high dams on the dam body is significant,and the deformation value obtained by this new method that takes into consideration of the reservoir basin deformation is closer to the measured value.