| 陈江*,熊峰,葛琪,刘浩吾.高拱坝气幕隔震的动力模型试验[J].实验力学,2015,30(3):282~288 |
| 高拱坝气幕隔震的动力模型试验 |
| Dynamic Model Experiment of Air-cushion Vibration Isolation Effect of High Arch Dam |
| 投稿时间：2014-06-27 修订日期：2014-12-25 |
| DOI：10.7520/1001-4888-14-116 |
| 中文关键词: 地震反应 动力控制 振动台试验 动水压力 动力相似 |
| 英文关键词:earthquake response power control shaking table experiment hydrodynamic pressure dynamic similarity |
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| 中文摘要: |
| 为了研究高拱坝的气幕隔震效果,基于动力相似准则,设计了坝体-坝基-气幕-库水三相耦合系统的动力试验模型。其中,坝体材料采用河沙、重晶石粉、铁粉、松香、酒精调制而成,坝基材料采用膨胀珍珠岩和石膏调制的轻质材料,气幕厚度为1cm,均匀地覆盖在坝体上游面,气室壁材料选用ABS工程塑料。基于该模型,完成了两种实测地震波不同峰值加速度共计12个工况的大型振动台试验。试验结果表明：气幕使动水压力显著降低,坝体加速度也相应减小；靠近坝底的测点动水压力削减达70%以上,坝顶加速度减小约20%。因此,气幕可提高坝体的抗震性能。 |
| 英文摘要: |
| In order to study the air cushion vibration isolation effect of high arch dams, a tri-phase coupling dynamic experimental model system composed of dam body-dam foundation-air-cushion-reservoir was designed based on the dynamic similarity criterion. Dam material is mixed with river sand, barite powder, ferrous powder, rosin and alcohol. Dam foundation material is a lightweight material mixed with expanded perlite and gypsum. The thickness of air-cushion is 1cm. Engineering plastics acrylonitrile butadiene styrene (ABS) is adopted for the air-room wall, which is used for covering the upstream side of dam model evenly. Based on this experimental model, 12 cases of large scale shaking table experiment were completed to measure two kinds of earthquake waves with different peaks accelerations. Experimental results show that air-cushion reduces the hydrodynamic pressure significantly, which results in the decrease of dam body acceleration correspondingly. The hydrodynamic pressure measured at the point nearby the dam bottom is reduced more than 70%; the acceleration of dam crest is reduced by roughly 20%. So the anti-seismic performance of dam can be improved by air-cushion. |
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