小浪底斜心墙堆石坝的地震反应分析

Analysis of Earthquake Reaction in Xiaolangdi Declined-Core Earth and Rockfill Dam

采用等价粘弹性动力有限元模型，结合有效应力法，对黄河小浪底斜心墙堆石坝最终设计断面在淤积后期受地震作用的动力特性进行了分析。分析时考虑了淤积土体内有未消散的超静孔丘。结果表明，坝体受里氏６．５级地震时，下游坝基及上游淤土表层均有一定范围的液化区，由于坝基液化区距坝体较远，因而只影响到坝趾压战的局部；当坝体受里氏８级地震时，坝趾下游近处的坝基砂砾石处于液化状态，上游库区淤土有较大范围的液化区，在上游反滤层中也有一定范围的液化区。

Employing the equivalent viscoelastic and dynamical model, together with the method of effective stress, we analyze the dynamical characteristics of the designed section of Xiaolangdi declined-core earth and rock fill dam caused by earthquake at the final stage of silt. Results showthat when the dam is subjected to earthquake of magnitude 6. 5 on the Richter scale. though liquified zones appear in the downstream dam foundation as well as upstream sediment layer. only aportion of the loaded area is affected at the dam site because the liquified zones are far from thedam, portion of the filter material was in the liquified state. when the dam is subjected to magnitude 8 earthquake, the entire sandy gravel of dam foundation downwtream from the dam site becomes liquified. Besides, the sediment layer and the filter material show regions of liquefaction.