Numerical and experimental estimation of anisotropy in granular soils using multi-orientation shear wave velocity measurements

IF 2.3 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Granular Matter Pub Date : 2023-07-11 DOI:10.1007/s10035-023-01345-8

Mandeep Singh Basson, Alejandro Martinez

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引用次数: 0

Abstract

Soils can have direction-dependent characteristics reflected in the anisotropy of their responses. Studies have demonstrated the impact of the stress state and history (i.e., stress-induced anisotropy) and the depositional processes and particle arrangements (i.e., fabric-induced anisotropy) on the anisotropy of macroscopic behaviors. However, quantifying the stress- and fabric-induced anisotropies remains a challenge. This study presents two investigations on the effects of stress- and fabric-induced anisotropy on the anisotropy of shear wave velocity (V_S). A framework based on the V_S measurements along various orientations and polarization planes obtained from discrete element method (DEM) simulations and experimental bender element (BE) tests is presented; this framework is tested using the results from specimens of spherical and non-spherical particles under isotropic and 1D compression. The observed trends indicate that the angular distributions of V_S are related to the angular distributions of particle alignment and interparticle contact forces. This framework, when presented in terms of the ratio of V_S measurements along different orientations and polarization planes and of the newly introduced Anisotropy parameter (A_e), can assist in evaluating the stress- and fabric-induced anisotropy of soil specimens. The results also highlight the challenges in discerning the effects of stress and fabric anisotropy when both influence the soil response.

Graphical abstract

Abstract Image

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基于多方向剪切波速测量的颗粒土各向异性数值与实验估计

土壤响应的各向异性可以反映出方向依赖性。研究表明应力状态和历史(即应力诱导的各向异性)以及沉积过程和颗粒排列(即织构诱导的各向异性)对宏观行为各向异性的影响。然而，量化应力和织物诱导的各向异性仍然是一个挑战。本文研究了应力和织物诱导的各向异性对剪切波速各向异性的影响。提出了一种基于离散元法(DEM)模拟和实验弯曲元(BE)试验获得的沿不同方向和偏振面VS测量结果的框架;利用球形和非球形颗粒在各向同性和一维压缩下的试样结果对该框架进行了测试。观察到的趋势表明，VS的角分布与粒子排列和粒子间接触力的角分布有关。该框架以不同方向和极化平面VS测量值的比值以及新引入的各向异性参数Ae来表示，可以帮助评估应力和织物诱导的土样各向异性。结果还强调了在识别应力和织物各向异性影响土壤响应时所面临的挑战。图形抽象

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来源期刊

Granular Matter Materials Science-General Materials Science

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

6 months

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.