Vacuum consolidation is a ground-improvement method in which negative pressure is applied to drain materials placed in a soft ground to consolidate the ground. Using the vacuum consolidation method, a soft ground can be consolidated without the shear deformation of the ground, and the combination of this method along with embankment loading enables the stable construction of the embankment and the suppression of the displacement of the surrounding ground. In this study, centrifuge-model experiments were conducted under a gravitational acceleration of 50g for the purpose of investigating the pore water pressure of the ground during both vacuum consolidation and embankment loading. Embankment loading was reproduced by a loading device consisting of an air cylinder and a loading plate, and vacuum consolidation was reproduced by depressurising the inside of a model drain using a vacuum pump. Three experimental cases were conducted: one case with only embankment loading and two cases with a combination of vacuum consolidation and embankment loading. From the experimental results, it was confirmed that in the ground where vacuum consolidation was applied, large negative pressure propagated near the drain material, and the increase in pore water pressure due to embankment loading was suppressed.

中文翻译：

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结合真空和路堤加载的孔隙水压力离心模型试验

真空固结是一种地面改良方法，其中施加负压以排出放置在松软地基中的材料以固结地面。采用真空固结法，可以在不发生地基剪切变形的情况下固结软地基，将该方法与路堤荷载相结合，可以使路基稳定施工，抑制周围地基的位移。在这项研究中，离心机模型实验是在 50 g的重力加速度下进行的用于研究真空固结和路堤加载过程中地面的孔隙水压力。通过由气缸和加载板组成的加载装置再现路堤加载，并通过使用真空泵对模型排水管内部进行减压来再现真空固结。进行了三个实验案例：一个只有路堤加载的案例和两个真空固结和路堤加载相结合的案例。实验结果证实，在施加真空固结的地层中，大的负压在排水材料附近传播，抑制了路堤荷载引起的孔隙水压力增加。