Applicability of soil-type index for shear wave velocity-based liquefaction assessment

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Earthquake Engineering & Structural Dynamics Pub Date : 2024-02-23 DOI:10.1002/eqe.4102

Nurhan Ecemis, Mehmet Murat Monkul, Murat Orucu

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Abstract

The current simplified liquefaction assessment method based on the shear-wave velocity, V_s has uncertainties about how the fine contents change the V_s-based liquefaction resistance. According to the simplified method, for a given V_s, the cyclic resistance ratio (CRR) increases with an increase in fine contents. However, field investigations recently revealed that for various silty sands, the correlation between CRR and V_s is soil-type index dependent and not specific for all sand-silt mixtures with the same fine contents. Therefore, a detailed experimental research program is performed in this study to clarify the effect of the soil-type index on the shear wave velocity and CRR correlation. In the first part of the present study, the cyclic resistance of sand mixed with non-plastic (NP) fines (dry weight of 0%, 5%, 15%, and 35%) was investigated using cyclic direct simple shear (CDSS) tests. Seismic cone penetration (SCPT) tests were performed inside the large-scale box to facilitate normalized cone penetration resistance (q_c1N) and shear wave velocity measurements on the soils used in the CDSS tests. A new correlation was proposed between the q_c1N and normalized shear wave velocity (V_s1) using the soil-type index I_c representing the behavior of soil. Then, CRR-V_s1 correlation was obtained experimentally for four distinct ranges of soil-type index. Finally, the results of this study and the proposed CRR-V_s1 trends in other investigations were used to discuss the soil-type dependent V_s-based liquefaction susceptibility zones.

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基于剪切波速的液化评估中土壤类型指数的适用性

目前基于剪切波速度（Vs）的简化液化评估方法在细粒含量如何改变基于 Vs 的液化阻力方面存在不确定性。根据简化方法，对于给定的 Vs，循环阻力比（CRR）会随着细粒含量的增加而增加。然而，最近的实地调查显示，对于各种淤泥质砂土，CRR 与 Vs 之间的相关性取决于土壤类型指数，而不是针对细粒含量相同的所有砂-淤泥混合物。因此，本研究进行了详细的实验研究，以明确土壤类型指数对剪切波速和 CRR 相关性的影响。在本研究的第一部分，使用循环直接单剪（CDSS）试验研究了掺有非塑性（NP）细粒（干重分别为 0%、5%、15% 和 35%）的砂的抗循环性。在大型箱内进行了地震锥入度（SCPT）试验，以方便对 CDSS 试验中使用的土壤进行归一化锥入度阻力（qc1N）和剪切波速度测量。利用代表土壤行为的土壤类型指数 Ic，提出了 qc1N 与归一化剪切波速 (Vs1) 之间的新相关性。然后，通过实验获得了四种不同土壤类型指数范围下的 CRR-Vs1 相关性。最后，本研究的结果和其他研究中提出的 CRR-Vs1 趋势被用于讨论基于 Vs 的土壤类型相关液化易感性区。

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

Earthquake Engineering & Structural Dynamics 工程技术-工程：地质

CiteScore

7.20

自引率

13.30%

发文量

180

审稿时长

4.8 months

期刊介绍： Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.

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