为研究高聚物防渗墙土质堤坝地震加速度反应规律,采用El Centro波,在0.05g、0.1g、0.2g和0.4g工况下进行了高聚物防渗墙土质堤坝和传统刚性防渗墙一混凝土防渗墙土质堤坝的离心机振动台的对比试验。试验采用非等应力离心模型,利用加速度传感器测量了坝体不同位置的加速度时程响应。结果表明:高聚物防渗墙土质堤坝峰值加速度随输入地震动增加而增加,随坝高增加而增加,最大峰值加速度在坝顶上;高聚物防渗墙土质堤坝最大峰值加速度随输入地震动的增大呈线性增加趋势,而最大峰值加速度放大系数随输入地震动增大而减小;从模型试验的角度来看,在同等水平地震作用下,混凝土防渗墙土质堤坝抗地震加速度反应能力好于高聚物防渗墙土质堤坝,但在强震下混凝土防渗墙体发生了破坏,这一点可由附近土体加速度突增判断。
To study the law of seismic acceleration response of earth dike and dam with polymer anti-seepage wall, the dynamic centrifuge contrast tests on earth dike and dam with polymer anti-seepage wall and earth dike and dam with concrete anti-seepage wall are conducted. The test wave is El Centro wave and 4 working conditions are 0.05 g, 0.1 g, 0.2 g and 0.4 g. Unequal stress model is used and acceleration time-histories response of dam is measured by acceleration sensors. Results show the peak acceleration of earth dike and dam with polymer anti-seep- age wall increases with the increasing of seismic oscillation, it also increases with the increasing of dam height and the maximum peak acceleration appears on the dam crest; The maximum peak acceleration linearly increases with the increasing of seismic oscillation, while the amplification coefficient of maximum peak acceleration decreases with the increasing of seismic oscillation ; From the point of model test, the resistance capacity for seismic accelera-tion of earth dike and dam with concrete anti-seepage wall is better than that of earth dike and dam with polymer anti-seepage wall under the same earthquake, however concrete anti-seepage wall are broken under strong earth- quake, which can be judged by suddenly increasing of nearby soil acceleration.