Influence of soil property variability on the lateral displacement of liquefiable ground reinforced by granular columns

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-09-20 DOI:10.1007/s11440-024-02407-8

Tengfei Mo, Qiang Wu, Dian-Qing Li, Wenqi Du

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引用次数: 0

Abstract

In this paper, three-dimensional nonlinear dynamic finite-element analyses are conducted to examine the effect of soil property variability on the lateral displacement (D) of liquefiable ground reinforced by granular columns. A suite of 20 ground motions is selected from the NGA-West2 database as input. A soil-granular column ground system consisting of an intermediate liquefiable layer is modeled in OpenSees. Both the random variable (RV) and random filed (RF) methods are adopted to model the variability of soil property parameters. Dynamic analyses are then conducted to estimate the earthquake-induced deformation of the soil-granular column system. It is found that modeling the variability of soil parameters based on the RV method generally increases the geometric mean and standard deviation (σ_lnD) of D for the soil-granular column system. Enlarging the spatial correlation of soil parameters in the RF model brings in a slight increase of the mean D and comparable σ_lnD values, respectively. Hence, incorporating the spatially correlated soil property parameters may not be necessarily increase the variation of D for the soil-granular column system. Specifically, the statistical distribution of D is more sensitive to the vertical scale of fluctuation rather than the horizontal one. The results presented could aid in addressing the variability issue for performance-based design of granular column-reinforced liquefiable ground in engineering applications.

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土壤特性变化对以颗粒柱加固的可液化地面侧向位移的影响

本文进行了三维非线性动态有限元分析，以研究土壤特性变化对由颗粒柱加固的可液化地面侧向位移（D）的影响。从 NGA-West2 数据库中选取了一套 20 种地面运动作为输入。在 OpenSees 中模拟了由中间可液化层组成的土壤-颗粒柱地面系统。采用随机变量（RV）和随机归档（RF）两种方法来模拟土壤属性参数的变化。然后进行动态分析，估算土粒柱系统的地震诱发变形。研究发现，基于 RV 方法的土壤参数变异性建模通常会增加土粒柱系统 D 的几何平均数和标准偏差（σlnD）。在射频模型中扩大土壤参数的空间相关性会分别带来平均 D 值和可比 σlnD 值的轻微增加。因此，加入空间相关的土壤性质参数并不一定会增加土壤-粒柱系统 D 的变化。具体来说，D 的统计分布对波动的垂直尺度比水平尺度更敏感。这些结果有助于解决工程应用中基于性能设计的粒料柱加固液化地基的变异性问题。

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 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.