Seismic damage and energy distribution of pile-geogrid supported high-speed railway subgrade

IF 5 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2026-02-01 Epub Date: 2025-10-31 DOI:10.1016/j.geotexmem.2025.10.006

Changwei Yang , Xianqing Xu , Zhikun Wang , Shibo Zhu , Mao Yue , Jing Lian , Shiguang Zhou

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引用次数: 0

Abstract

This study investigates the seismic damage and energy distribution of pile-geogrid supported high-speed railway subgrades using shaking table tests and time-frequency analysis methods such as STFT, SPWVD, WPD, and EMD. We found that cracks begin to appear at the base of the foundation when PGA reaches 0.2 g and severe damage occurs after PGA exceeds 0.6 g. The geogrids enhance soil integrity and mitigate PGA amplification factors. They distribute shear stresses to surrounding soil or other geogrids. Low-frequency waves play a predominant role in seismic damage due to their longer propagation distances. Scattering leads to changes in energy distribution as seismic waves propagate through caustic surfaces. The energy attenuation characteristics of high-frequency signal components and the increased contribution of low-frequency components under high PGA conditions are observed. An increase in the difference in variance contribution rate (VCR) indicates inconsistencies in the vibration characteristics of the soil. The sudden changes in Intrinsic mode functions (IMFs) suggest that the energy of seismic waves is amplified and attenuated to varying degrees. These findings provide a more solid theoretical foundation and novel approaches for the seismic design and performance assessment of high-speed railway subgrades.

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桩-土工格栅支撑高速铁路路基的震害与能量分布

采用振动台试验和STFT、SPWVD、WPD、EMD等时频分析方法，对高速铁路桩基土工格栅路基的地震损伤及能量分布进行了研究。我们发现，当PGA达到0.2 g时，基础底部开始出现裂缝，当PGA超过0.6 g时，基础底部出现严重破坏。土工格栅提高了土壤完整性，减小了PGA放大因子。它们将剪应力分布到周围的土壤或其他土工格栅上。低频波由于其传播距离较远，在地震灾害中起主导作用。当地震波通过苛性表面传播时，散射导致能量分布的变化。在高PGA条件下，观察到高频信号分量的能量衰减特性和低频分量的贡献增加。方差贡献率差异（VCR）的增大表明土的振动特性不一致。内禀模态函数（IMFs）的突变表明地震波的能量有不同程度的放大和衰减。这些研究结果为高速铁路路基抗震设计和性能评价提供了更为坚实的理论基础和新方法。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.