Innovative insights into micropile seismic response: Shaking table tests reveal critical dependencies and liquefaction mitigation

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-03-25 DOI:10.1007/s10064-025-04225-y

Saba Ghassemi, Seyed Saeid Ekraminia, Masoud Hajialilue-Bonab, Hamid Reza Tohidvand, Mohammad Azarafza, Reza Derakhshani

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Abstract

This study presents a novel investigation into the seismic response of micropiles through shaking table tests, diverging from the predominant reliance on numerical analyses in assessing micropiles in liquefiable sites. Three models of shaking table tests were conducted using Iai scaling rules for physical modelling in 1-g conditions. The investigation reveals a significant dependency of micropile efficiency on the frequency of input motions. During the 2 Hz test, the entire model experienced liquefaction; however, in the 3 Hz test, there was a remarkable 29% reduction in excess pore water pressure. Additionally, the study explores the impacts of varying distances between micropiles and examines how liquefaction influences the induced peak accelerations at different depths within the soil media. Notably, recorded accelerations on the surface decreased by up to 76% in the free field tests during liquefaction. This comprehensive exploration advances our understanding of micropile behaviour under seismic conditions, offering valuable insights for soil improvement projects.

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微桩地震反应的创新见解：振动台试验揭示了关键依赖关系和液化缓解

本研究通过振动台试验对微桩的地震反应进行了新颖的研究，不同于在可液化场地评估微桩时主要依赖于数值分析。采用Iai标度规则进行1-g条件下的物理建模，进行了3个模型的振动台试验。研究表明，微桩的效率显著依赖于输入运动的频率。在2 Hz试验过程中，整个模型发生液化；然而，在3hz试验中，超孔隙水压力显著降低29%。此外，该研究还探讨了微桩之间不同距离的影响，并研究了液化如何影响土壤介质中不同深度的诱发峰值加速度。值得注意的是，在液化期间的自由现场测试中，地面记录的加速度下降了76%。这种全面的探索促进了我们对地震条件下微桩行为的理解，为土壤改良项目提供了有价值的见解。

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

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.