粉煤灰坝模型试验研究

以湖南省耒阳电厂粉煤灰坝的加高加固工程为研究背景,采用大型液压伺服式振动台作为试验手段,分别对高程为170,180,230 m的灰坝模型进行了动力特性试验研究,并进行了计算验证。同时,对采用3种不同灰渣拌合料加高的180 m高程灰坝模型进行了动力特性评价并认为其对灰坝的整体动力特性没有太大的影响。试验结果表明,灰坝的自振频率是随着激振加速度的增大和坝体的加高而降低的;坝顶加速度放大倍率也是随激振加速度的增大而降低的;两者在有干滩工况下普遍大于无干滩工况。

TESTS ON DYNAMIC BEHAVIOR OF FLY ASH DAM

Based on the case of the fly ash dam of Leiyang Power Station in Hunan Province,the dynamic behavior of the fly ash dam at the elevations of 170,180 or 230 m with submerged beach or non-submerged beach is studied by models on the large-scale vibration table.The evaluation of earthquake-resistant behavior is also made on the models of 180 m fly ash dams heightened by three mixtures,and it is shown that the mixture type has little influence on the earthquake-resistant behavior of the dam.The tests show that the natural frequency of dam and the acceleration amplification ratio at the top of dam decrease with the increase of excitation acceleration and dam height and are lower under the condition of submerged beach than those of non-submerged beach.