Improvement in seismic resistance using replacement/counterweight fill method for existing high embankments on inclined ground constructed with various embankment materials
Improvement in seismic resistance using replacement/counterweight fill method for existing high embankments on inclined ground constructed with various embankment materials
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采用置换/配重填充法提高各种路堤材料建造的倾斜地面上现有高路堤的抗震性能
DOI：
10.1016/j.sandf.2023.101284
复制
发表时间：
2023
影响因子：
3.7
通讯作者：
M
中科院分区：
文献类型：
--
作者：
Sakai;T.;Nakano;M.;Inukai;S. and Inagaki;M
现有路堤的抗震性能已成为一个重要的问题，因为路堤经常因地震而破坏。然而，只有有限的方法可以改善这些现有堤防的地震活动性。本研究提出了一种新的改进方法，称为“置换/配重填充法”，以提高抗震性能。在倾斜的地面上建造了两个不同材料的高路堤，并对它们采用了替换/配重填充法。进行了地震反应分析，以调查地震活动性改善的有效性。研究发现，替换/配重填筑法可使路堤剪切应变面积减小30%以上，抑制路堤变形，提高路堤抗震性能。随着配重填方高度的增加，该方法的有效性增加，抗震性能进一步提高。采用替换/配重填筑法，通过增大路堤内部平均有效应力、减小比例尺、减小应力比（q/p’）、减小地震过程中卸载导致的超固结比增大所引起的塑性变形，有助于提高路堤的抗震性能。增加配重填充物的高度被认为比增加配重填充物的宽度更有效地抑制路堤变形，因为增加配重填充物的高度意味着加固效果的面积将扩大。
The seismic resistance of existing embankments has become a significant issue as embankments fail frequently because of earthquakes. However, there are only a limited number of methods that can improve the seismicity of these existing embankments. In this study, a new improvement method, called the “replacement/counterweight fill method”, is proposed to improve seismic resistance. Two high embankments, of different materials, were constructed on an inclined ground and the replacement/counterweight fill method was applied to them. A seismic response analysis was performed to investigate the effectiveness of the improvement in seismicity. It was found that the replacement/counterweight fill method reduced the area of shear strain by more than 30%, suppressed the deformation of the embankments, and improved the seismic resistance. Along with the increase in the height of the counterweight fill, the effectiveness of this method increased and the seismic resistance was improved even further. Applying the replacement/counterweight fill method contributed to the improvement in seismic resistance by increasing the mean effective stress inside the embankments, decreasing the specific volume, decreasing the stress ratio (q/p’), and reducing the plastic deformation caused by the increase in the overconsolidation ratio due to unloading during the earthquake. Increasing the height of the counterweight fill was seen to be more effective for suppressing embankment deformation than increasing its width because increasing the height meant that the area of the reinforcement effect would be expanded.
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