为了研究土工袋垫层不同结构形式对减隔震特性的影响,考虑输入振动波峰值加速度、土工袋垫层铺设形式、支挡结构、袋间缝隙等因素对垫层减隔震特性的影响,开展了一系列小型振动台模型试验。试验结果表明:随着输入峰值加速度的增大,3种常见铺设形式(直立式、扩散式、交错式)的土工袋垫层模型均表现出一致的规律,即输入峰值加速度越大垫层模型整体表现出的减隔震效果越好。通过对3种不同铺设形式土工袋垫层模型沿高度方向的加速度响应情况进行对比,发现交错式土工袋垫层对振动波的衰减作用最显著;通过进一步开展在垫层周围设置支挡结构工况的模型试验,发现在设置支挡结构不仅可以有效提高垫层整体的减隔震效果,还能有效防止周围土体流入到袋间缝隙中;土工袋袋间缝隙可以对振动波的传递起到一定的阻隔作用,通过在土工袋袋间设置缝隙的方式能够进一步提高土工袋垫层整体的减隔震作用。
Abstract
To investigate the influence of structural form on the vibration reduction and isolation effect of soilbag foundations, a series of small shake table model tests were conducted. The influential factors primarily consisted of the peak ground acceleration (PGA) of the input motion, the arrangement form of the soilbag foundation, the retaining structure, and the interspace between adjacent soilbags. Test results demonstrate that a higher PGA yields a greater impact on the vibration reduction and isolation of soilbag foundations, irrespective of the arrangement form. By comparing the acceleration response within model foundations featuring different soilbag arrangement forms, we found that the interlaced soilbag foundation exhibited a significant effect on the attenuation of vibration waves. Furthermore, the presence of a retaining structure within the foundation trench effectively enhances the vibration reduction and isolation effect of soilbag foundations, and also prevents the surrounding soil from falling into the interspace between soilbags. Additionally, maintaining an appropriate interspace between soilbags proved to be advantageous in maximizing the benefits of vibration reduction and isolation in soilbag foundations.
关键词
土工袋垫层 /
振动台试验 /
铺设形式 /
支挡结构 /
袋间留缝
Key words
soilbag cushion /
shake table test /
arrangement form /
retaining structure /
interspace between soilbags
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基金
国家重点研发计划专项(2017YFE0128900);国家自然科学基金项目(52109123)
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