Liquefaction-induced flow slide is one of the main reasons to cause severe damage of embankment dams. In this paper, the effect of near-fault pulse-like ground motions on the seismic performance of earth dams susceptible to liquefaction-induced damage is quantitatively investigated. A generic earth dam founded on a liquefiable soil layer is modeled in OpenSees based on a finite-element approach. Two suites of near-fault ground motions, namely one pulse-like and one ordinary suite, respectively, are selected from the NGA-West2 database. Both selected ground-motion suites have statistically comparable earthquake magnitudes, rupture distances, and shaking intensities. Dynamic analyses are then conducted for the earth dam subjected to both ground-motion suites. Comparative results indicate that the pulse-containing ground motions have a greater potential to trigger liquefaction in the loose-sand layer as compared to the ordinary near-fault motions. As to post-liquefaction performance, using the pulse-containing ground-motion suite leads to an enlarged distribution of both maximum lateral displacements and crest settlements of the earth dam, in comparison with those caused by the ordinary ones. Therefore, when subjected to pulse-like ground motions, an earth dam at sites susceptible to liquefaction hazard would possibly suffer an exacerbated post-liquefaction deformation and damage. Besides, it is found that the resultant lateral displacements and crest settlements for the pulse-like suite are strongly correlated to the duration and cumulative-energy parameters of ground motions.

液化引起的滑坡是引起堤坝严重破坏的主要原因之一。本文定量研究了近断层脉冲状地震动对液化诱发损伤的土坝抗震性能的影响。在OpenSees中，基于有限元方法对建立在可液化土壤层上的通用土坝进行了建模。从NGA-West2数据库中选择了两组近断层地面运动，分别是一个脉冲状运动和一个普通运动。两种选定的地震动套件在统计上都具有可比的地震震级，破裂距离和震动强度。然后对受两个地震动影响的土坝进行动态分析。比较结果表明，与普通的近断层运动相比，含脉冲的地层运动具有更大的触发松散砂土液化的潜力。关于液化后的性能，与普通情况相比，使用含脉冲的地震动套件可导致土坝的最大横向位移和波峰沉降的分布扩大。因此，当经受类似脉冲的地面运动时，易受液化危害的地点的土坝可能会加剧液化后的变形和破坏。此外，已经发现，脉冲状套件的合成横向位移和波峰沉降与地面运动的持续时间和累积能量参数密切相关。