Understanding the influence of drained cyclic preloading on liquefaction resistance of sands using DEM-clump modeling

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-03 DOI:10.1016/j.compgeo.2024.106800
Siyuan Yang, Duruo Huang
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Abstract

The soils in situ are subjected to various types of preloading histories. Extensive work has been devoted to understanding the impact of undrained preloading with different strain histories on the reliquefaction resistance of sands. This study primarily examines the effects of drained cyclic preloading histories on the liquefaction resistance of soils using DEM-clump modeling. The effects of preloading stress path and preloading deviatoric stress amplitude on the drained cyclic behavior and subsequent undrained liquefaction response are discussed. Moreover, the evolution of two microscale descriptors, including coordination number Z and fabric anisotropy degree ac, during the total process is analyzed. The results demonstrate that a smaller preloading stress amplitude and an increasing preloading cycle generally increase the liquefaction resistance of sandy soils. In comparison, a larger preloading stress amplitude significantly reduces the liquefaction resistance. We also reveal that drained cyclic preloading histories induce soil samples with different relative densities and fabrics. The relationship between relative density and liquefaction resistance of soils is not unique. Essentially, Z and ac are good indexes for determining the liquefaction resistance of soils with various drained cyclic preloading histories. The primary objective of this study is to elucidate the micromechanical effects of drained cyclic preloading on the liquefaction resistance of sandy soils.
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利用 DEM-团块模型了解排水循环预加载对砂的抗液化性的影响
原地土壤会受到各种类型的预加载。为了了解不同应变历史的排水预加载对砂的抗再液化性的影响,已经开展了大量工作。本研究主要利用 DEM-团块模型研究排水循环预加载历史对土壤抗液化性的影响。研究讨论了预加载应力路径和预加载偏差应力振幅对排水循环行为和随后的非排水液化响应的影响。此外,还分析了整个过程中两个微观描述指标的演变,包括配位数 Z 和结构各向异性度 ac。结果表明,较小的预加载应力振幅和增加的预加载周期通常会提高砂土的抗液化能力。相比之下,较大的预加载应力振幅会明显降低抗液化能力。我们还发现,排水循环预加载历史会诱发具有不同相对密度和结构的土样。土壤的相对密度和抗液化性之间的关系并不是唯一的。从本质上讲,Z 和 ac 是确定不同排水循环预载历史的土壤抗液化性的良好指标。本研究的主要目的是阐明排水循环预载对砂土抗液化性的微观力学影响。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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