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面板堆石坝的抗震研究一般都假定地震动振动方向沿坐标轴主轴方向,不考虑地震动振动方向的不确定性;现行的水工规范对地震动的入射方向也未给出明确规定,工程实践中也无统一标准。以某面板堆石坝为例,采用基于等价黏弹性模型的等效线性分析方法,进行了不同地震动输入方向作用下的地震反应分析,研究比较了24个不同地震动输入方向下面板堆石坝的加速度、动位移和主应力反应。结果说明,在确定的场地波作用下,地震动最不利输入方向并不一定是沿坐标主轴方向;场地波作用下,沿240°方向输入地震动作用时大坝的动力反应最大。在工程设计中不考虑地震动输入方向的计算结果会偏于危险,结论可为类似工程抗震设计提供技术依据与参考。
The seismic research of CFRD generally assumes the direction of the seismic vibration along the direction of the principal axis of the coordinate axis, and does not consider the uncertainty of the direction of the seismic vibration. The current hydraulic code does not specify the incident direction of the seismic motion either. Engineering There is no uniform standard in practice. Taking a concrete face rockfill dam as an example, the equivalent linear analysis method based on the equivalent viscoelastic model was used to analyze the seismic responses under different ground motions. The effects of different ground motions on the panel stack Rock dam acceleration, dynamic displacement and the main stress response. The results show that the most unfavorable input direction of ground motions is not always along the major axis of the earth under the action of the determined ground waves. The dam’s dynamic response is maximal when the ground motion is input along the 240 ° direction by the ground waves. In the engineering design, the calculation result without considering the input direction of ground motion would be partial to danger. The conclusion can provide the technical basis and reference for the aseismic design of similar projects.