Prediction of ground vibration under combined seismic and high-speed train loads considering earthquake intensity and site category

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2023-12-23 DOI:10.1016/j.sandf.2023.101412

Wei Xie , Guangyun Gao , Jian Song , Yonggang Jia

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引用次数: 0

Abstract

Based on a two-and-half-dimensional finite element model (2.5D FEM), the layered ground vibration under combined seismic and high-speed train loads was investigated. On this basis, the effect of site category and earthquake intensity on ground vibration under the combined action of two dynamic loads was analyzed. Numerical examples indicated that ground vibration displacement due to combined loads decreases with the increase of soil stiffness, while the influence of soil stiffness on the ground vibration is small when the hardness of the subsoil is large. The peak ground displacement (PGD) is a reasonable seismic intensity index for predicting the ground vibration displacement at the track center under the combined loads, which has a higher accuracy for hard ground. In view of this, an equivalent shear wave velocity and PGD-based prediction formula was proposed to estimate the ground vibration under combined seismic and high-speed train loads. Reliability of the prediction formula was verified through comparison with results of numerical tests, indicating that the prediction formula has good applicability to different site conditions and seismic events. Compared with the previous study, it demonstrated that the prediction method provided an effective means for estimating ground vibration caused by a high-speed train load during earthquakes.

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考虑地震烈度和场地类别，预测地震和高速列车联合荷载下的地面振动

基于二维半有限元模型（2.5D FEM），研究了地震和高速列车联合荷载作用下的分层地面振动。在此基础上，分析了场地类别和地震烈度对两种动荷载共同作用下地面振动的影响。数值实例表明，组合荷载引起的地面振动位移随土壤刚度的增加而减小，而当底土硬度较大时，土壤刚度对地面振动的影响较小。地表位移峰值（PGD）是预测组合荷载作用下轨道中心地表振动位移的一个合理的地震烈度指标，对于坚硬地层具有较高的精度。有鉴于此，提出了基于等效剪切波速度和 PGD 的预测公式，用于估算地震和高速列车联合荷载下的地震动。通过与数值试验结果的对比，验证了预测公式的可靠性，表明该预测公式对不同场地条件和地震事件具有良好的适用性。与之前的研究相比，该预测方法为估算地震时高速列车荷载引起的地面振动提供了有效手段。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.