高面板坝地震动非一致输入响应规律

在多点输入方法和等价黏弹性模型的基础上，采用半解析的波函数组合法实现了面板堆石坝在非一致输入下的动力计算。从频域散射角度对计算方法的合理性进行了验证。对比了非一致输入与一致输入下高面板堆石坝的动力响应，发现在采用基岩自由表面点的振动过程相同的对比标准下，非一致输入的整体动力响应较小；在面板坝防渗系统相对薄弱的止水结构附近，非一致输入的动拉应力最大值比一致输入的结果更大；非一致输入下大坝动力响应值的分布相比一致性输入呈现出中间小、周边大的特性。并基于波动理论进一步分析了不同种类地震波入射角度对高面板堆石坝动力响应的影响，揭示了P波、SV波和SH波入射下高面板堆石坝动力响应规律：随着入射角的增大，SH波入射时，高面板坝动力响应强度基本不变； SV波入射时，存在一个临界角，当入射角在临界角左右时高面板坝动力响应强度急剧增大和减小，之前基本不变，之后一直减小；P波入射时，存在一个特征角度，在入射角小于特征角度时高面板坝动力响应强度基本不变，大于特征角度时高面板坝动力响应强度减小。

Seismic response of high concrete face rockfill dams subject to non-uniform input motion

Based on multipoint ground motion input method and an equivalent visco-elastic constitutive model for rockfill, a semi-analytical method is used to conduct dynamic analysis of high concrete face rockfill dams (CFRD) subject to non-uniform input motion. The validation of the calculation method is first conducted in the frequency domain. Under the condition that the acceleration time histories on the surface of the free field are assumed to be consistent for different modes of non-uniform and uniform seismic input, the following main conclusions can be drawn. The seismic response to the non-uniform input is generally smaller than that to the uniform input. The dynamic tensile stresses become obviously larger at the waterstops (the seepage control system of CFRD) for the non-uniform input than for the uniform one. The seismic responses of the high CFRD to the non-uniform input are characterized by the smaller in central part and the larger around the boundary. The seismic response of high CFRDs under the incidence of P, SV and SH waves are featured by the following several main facts and findings: With increasing incident angle for SH waves, the response intensity shows almost constant. There exists a critical angle for SV waves. When the incident angle is close to the critical angle, the response intensity first increases and then decreases sharply, and before that, the intensity is nearly constant, while after that, the intensity keeps decreasing. There exists a feature angle for P waves. When the incident angle is smaller than it, the response intensity is almost constant, while when larger, the intensity keeps decreasing.