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一、前言修建在宽河谷上土坝的振动分析,通常均按平面问题计算。计算方法一般有两种:一是简化成剪切悬臂梁的一维计算;二是用平面有限元法计算。土坝的振动计算是一整体计算,以往的试验和计算表明,悬臂梁轴线上的变位用平面有限元法与用剪切悬臂梁法算得的结果是很接近的,算得的自振频率也很接近。因此剪切悬臂梁法仍然是土坝(按平面问题)动力计算的主要方法。当坝修建在窄河谷上时,则应考虑空间整体作用,应按空间问题计算。
I. INTRODUCTION Vibration analysis of earth dams built on wide valleys is usually calculated according to the plane problem. There are generally two kinds of calculation methods: one is to simplify the one-dimensional calculation of shear cantilever beam; the other is to use plane finite element method to calculate. The calculation of earth dam vibration is a whole calculation. The previous experiments and calculations show that the plane finite element method of displacement on the axis of the cantilever is very close to the result calculated by the shear cantilever method. The calculated natural frequency very close. Therefore, the shear cantilever method is still the main method of dynamic calculation of earth dam (according to plane problem). When dams are built in narrow valleys, the overall effect of space should be considered and should be calculated on a space-based basis.