粉煤灰坝动力特性试验研究

Experimental research on dynamic property of fly-ash dam

以某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 m 和 230 m 灰坝的模型进行了动力特性试验研究。同时,对采用三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,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随激振加速度的增大而降低;两者在有干滩工况下普遍大于无干滩工况。

The dynamic property tests were done on the models of fly-ash dams at the elevations of 170 m, 180 m and 230 m of a power station by the large-scale shaking table with two conditions of submerged and non-submerged beaches. The earthquake-resistance properties of the models of 180 m-ash dams heightened by three mixtures of fly ash are analyzed and the conclusion is drawn that three mixtures have little influence on the dynamic property of dam. The tests also show that the natural frequency of dam and the acceleration amplification factor at the top of dam decrease with the increases of excitation acceleration and the height of dam; and both are lower under the condition of submerged beach.