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首页> 外文期刊>Bulletin of earthquake engineering >Seismic response of partially saturated soils beneath shallow foundations under sequential ground motions
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Seismic response of partially saturated soils beneath shallow foundations under sequential ground motions

机译：顺序地面运动下浅层基础下方部分饱和土壤的地震响应

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摘要

Induced partial saturation is an innovative soil improvement technique intended to mitigate earthquake-induced liquefaction. Historical records indicate that successive earthquakes may occur in high seismic areas. Therefore, a comprehensive understanding of the response of partially saturated soils to sequential ground motions is of great significance for the rational design and execution of this method in engineering practice. In this study, a series of dynamic centrifuge experiments were conducted to investigate the impacts of sequential ground motions on the behavior of partially saturated soils beneath shallow foundations. Two different shallow foundation models with a bearing pressure of 135 kPa and 50 kPa were examined. Three seismic simulations, in order of increasing amplitudes, were sequentially applied to loosely-packed partially saturated sand models prepared with air injection technique. The assessment of the test results indicated that shallow foundations resting on saturated models of loose sand did suffer excessive settlements with each event, producing a large embedment of the foundation. However, much smaller settlements were recorded for partially saturated ground, and the level of the foundation embedment remained limited in this case. The deformation vector fields also indicated that different displacement mechanisms were observed for each successive event.
机译：诱导的部分饱和度是一种创新的土壤改进技术，旨在减轻地震诱导的液化。历史记录表明，在高地震区域可能发生连续地震。因此，全面了解部分饱和的土壤对顺序地运动的响应对工程实践中该方法的合理设计和执行具有重要意义。在这项研究中，进行了一系列动态离心实验，以研究顺序地面运动对浅层基础下部分饱和土的行为的影响。检查具有135kPa轴承压力和50kPa的两种不同的浅基础模型。按增加的振幅的三个地震模拟被依次施加到用空气喷射技术制备的松散填充的部分饱和砂模型。对测试结果的评估表明，围绕饱和砂型的浅层基础确实遭受了每项事件的过度定居点，产生了基础的大型嵌入。然而，对于部分饱和的地面记录了更小的沉降，并且在这种情况下，基础嵌入的水平仍然有限。变形载体场还表明为每个连续事件观察到不同的位移机制。

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