The small-strain elastic shear wave velocity (\(V_S\)) is a basic mechanical property of soils and is an important parameter in geotechnical engineering. Recently, \(V_S\) has been adopted as one of the indices for development of liquefaction charts. This implies that if a parameter affects \(V_S\), it may also affect liquefaction resistance. Some of the parameters whose effects have been accounted for include relative density, stress state and geologic age. An important parameter that affects both liquefaction resistance and \(V_S\) is fabric. Quantification of in situ fabric is still an open problem and hence, considerable judgement is needed in order to map laboratory test results to field conditions. In this paper, we conduct numerical simulations at the grain-scale to investigate the effect of fabric on \(V_S\). We start by showing that two granular assemblies, with the same stress state and void ratio but different fabrics, can exhibit different trends in liquefaction behavior. Furthermore, via a numerical implementation of the bender element test, we obtain two distinct trends of \(V_S\) anisotropy for the two granular assemblies. Finally, we consider three different fabric measures based on contact properties and explore correlations between \(V_S\) anisotropy and fabric anisotropy. We also look at fabric tensors of the ‘strong’ and ‘weak’ network, respectively, of the granular assemblies. Our results suggest that for liquefiable soils, i.e., recent Holocene-age deposits with negligible cementation and with a stress history of seismic loading, a knowledge of \(V_S\) anisotropy can give information about fabric anisotropy. A knowledge of in situ fabric could help in more accurately mapping laboratory test results to field conditions.

中文翻译：

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织物对粒状土壤剪切波速度的影响

小应变弹性剪切波速度（\（V_S \））是土壤的基本力学性质，是岩土工程中的重要参数。最近，\（V_S \）已被用作液化图开发的指标之一。这意味着如果参数影响\（V_S \），那么它也可能影响抗液化性。影响其影响的一些参数包括相对密度，应力状态和地质年龄。影响液化阻力和\（V_S \）的重要参数是面料。现场织物的量化仍然是一个未解决的问题，因此，需要大量的判断才能将实验室测试结果映射到现场条件。在本文中，我们在晶粒度上进行了数值模拟，以研究织物对\（V_S \）的影响。我们首先显示出两个具有相同应力状态和孔隙率但织物不同的颗粒状装配体在液化行为方面可呈现出不同的趋势。此外，通过对弯曲单元测试的数值实现，我们获得了两个颗粒组件的\（V_S \）各向异性的两个不同趋势。最后，我们基于接触特性考虑三种不同的织物度量，并探讨\（V_S \）之间的相关性各向异性和织物各向异性。我们还将分别查看粒状装配体的“强”和“弱”网络的结构张量。我们的结果表明，对于可液化的土壤，即胶结作用可忽略不计且地震荷载的应力历史最近的全新世时代的沉积物，\（V_S \）各向异性的知识可以提供有关织物各向异性的信息。原位织物知识可以帮助更准确地将实验室测试结果映射到现场条件。