Effect of multidirectional cyclic loading history on reliquefaction behaviors of sand: a microscale investigation

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-12-13 DOI:10.1007/s11440-024-02477-8

Siyuan Yang, Duruo Huang, Feng Jin

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引用次数: 0

Abstract

Soil elements in situ are subjected to multidirectional shearing during earthquakes. Ignoring the effect of two horizontal shear components generally results in an underestimation of the liquefaction resistance of soils during earthquakes. The actual earthquake sequence generally consists of a mainshock and subsequent aftershocks. Soils may experience liquefaction during the mainshock and then reliquefy again during the subsequent aftershocks. Previous studies on multidirectional loading paths have mainly focused on single liquefaction events. This study employs 3D discrete element modeling to simulate reliquefaction behavior of sands with various multidirectional cyclic simple shear loading histories. The specimens are initially subjected to various strain histories under multidirectional loading paths and then reconsolidated to initial stress states. Subsequently, each soil specimen is subjected to unidirectional cyclic loading in two different directions in the reliquefaction tests. The influence of multidirectional cyclic loading histories on the post-liquefaction drainage compression and reliquefaction resistance are analyzed. Moreover, the evolution of soil fabrics and interaction between fabric orientation and loading direction in the reliquefaction test are investigated. The results highlight that reliquefaction behavior of soils depends on both the fabric and the interaction between the fabric orientation and the loading direction. This study aims to provide micromechanical insight for understanding the effects of multidirectional shearing histories on reliquefaction resistance of sands.

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多向循环加载历史对砂土再液化行为影响的微观研究

在地震过程中，原位土元受到多向剪切作用。忽略两个水平剪切分量的影响通常会导致低估地震时土壤的抗液化能力。实际的地震序列通常由主震和随后的余震组成。土壤可能在主震期间经历液化，然后在随后的余震中再次液化。以往对多向加载路径的研究主要集中在单一液化事件上。采用三维离散元模型模拟了不同多向单剪循环加载历史下砂土的再液化行为。试样在多向加载路径下经历不同的应变史，然后重新固结到初始应力状态。然后，在再液化试验中，每个土样在两个不同的方向上进行单向循环加载。分析了多向循环加载历史对液化后排水压缩和再液化阻力的影响。此外，还研究了再液化试验中土体组构的演变以及组构方向与加载方向的相互作用。结果表明，土体的再液化行为既取决于织物，也取决于织物取向与加载方向之间的相互作用。本研究旨在为了解多向剪切历史对砂土再液化阻力的影响提供微观力学视角。

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来源期刊

Acta Geotechnica ENGINEERING, GEOLOGICAL-

CiteScore

9.90

自引率

17.50%

发文量

297

审稿时长

4 months

期刊介绍： Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.