Development of a simple test to quantify the consolidation properties of liquefied granular materials

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
L. Tauskela, O. Adamidis, W. A. Take
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引用次数: 0

Abstract

Liquefaction can have devastating consequences by causing increased mobility of debris flows, tailings dam breaches, and settlement following seismic shaking. Observations on the consolidation behaviour of liquefied soils in 1-g or centrifuge shake table tests have permitted significant advancements in analytical and numerical methods to predict the rate and magnitude of consolidation settlement. However, advanced consolidation models introduce material parameters which are currently difficult to define quickly and at low cost. The objective of this paper is to demonstrate the development of a simple, low-cost test that can be used to quickly estimate the spatially and temporally varying coefficient of consolidation, which controls post-liquefaction settlements. Using the proposed simple setup, experiments were conducted on four uniformly graded sands of varying grain size and on one well-graded mixture. A range of analytical and numerical approaches from literature were assessed for their ability to back-analyse the observed pore pressure dissipation and settlement. Estimated values for the coefficient of consolidation were comparable between models and estimates of surface settlement matched well the experimental results. The simplicity of the proposed test combined with its low-cost and mobile nature, raise significant possibilities for quick estimations of the evolution of the coefficient of consolidation post-liquefaction.

开发一种量化液化颗粒材料固结特性的简单试验
液化可能会造成毁灭性的后果,导致泥石流的流动性增加,尾矿坝决口和地震震动后的沉降。在1g或离心机振动台试验中对液化土壤固结行为的观察,使预测固结沉降速度和幅度的分析和数值方法取得了重大进展。然而,先进的固结模型引入了目前难以快速和低成本确定的材料参数。本文的目的是展示一种简单,低成本的测试的发展,可以用来快速估计空间和时间变化的固结系数,它控制液化后的沉降。利用提出的简单装置,对四种不同粒度的均匀级配砂和一种级配良好的混合砂进行了实验。一系列的分析和数值方法从文献评估他们的能力,以反分析观察到的孔隙压力耗散和沉降。模型间固结系数的估计值具有可比性,地表沉降估计值与实验结果吻合较好。所提议的试验的简单性,加上其低成本和可移动的性质,为快速估计液化后固结系数的演变提供了重要的可能性。
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
Acta Geotechnica
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.
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