Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Access type: Open accessAuthor: search.filters.author.Ecemis, Nurhan

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  • Article
    Citation - WoS: 4
    Citation - Scopus: 4
    Applicability of Soil-Type Index for Shear Wave Velocity-Based Liquefaction Assessment
    (Wiley, 2024) Ecemis, Nurhan; Monkul, Mehmet Murat; Orucu, Murat
    The current simplified liquefaction assessment method based on the shear-wave velocity, Vs has uncertainties about how the fine contents change the Vs-based liquefaction resistance. According to the simplified method, for a given Vs, 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 Vs 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 (qc1N) and shear wave velocity measurements on the soils used in the CDSS tests. A new correlation was proposed between the qc1N and normalized shear wave velocity (Vs1) using the soil-type index Ic representing the behavior of soil. Then, CRR-Vs1 correlation was obtained experimentally for four distinct ranges of soil-type index. Finally, the results of this study and the proposed CRR-Vs1 trends in other investigations were used to discuss the soil-type dependent Vs-based liquefaction susceptibility zones.
  • Article
    Citation - WoS: 9
    Citation - Scopus: 8
    Effect of Drainage Conditions on Cpt Resistance of Silty Sand: Physical Model and Field Tests
    (Springer, 2023) Ecemis, Nurhan; Arık, Mustafa Sezer; Taneri, Hazal
    The influence of drainage conditions on cone penetration test (CPT) resistance and the excess pore pressure during cone penetration in sand and silty sand are examined using field and physical model tests. Drainage can generally occur in saturated clean sand and silty sand under certain conditions. This work aims to understand and explain the effect of sand and silty sand drainage conditions on CPT resistance and pore pressure through the coefficient of consolidation (c h) and penetration rate (v). The physical model test results indicate the significant effect of excess pore pressures and their dissipation rates, depending on the coefficient of consolidation (silt content) and the penetration rate on cone resistance. For the same relative density, normalized CPT resistance decreases as there is a reduction in c h (or an increase in silt content) or an increase in penetration rate. The difference in CPT resistance in silty sand is attributed to drainage conditions. Finally, the results revealed in this study and the field test data reported in the literature were combined to develop an equation for the effect of drainage conditions on excess pore water pressure and CPT resistance. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
  • Article
    Citation - WoS: 7
    Citation - Scopus: 8
    Cpt-Based Liquefaction Resistance of Clean and Silty Sands: a Drainage Conditions Based Approach
    (Springer, 2022) Ecemis, Nurhan; Monkul, Mehmet Murat; Tütüncü, Yunus Emre; Arik, Mustafa Sezer
    The cone penetration test-based simplified liquefaction triggering evaluations are largely based on linking liquefaction manifestations in the field to cone penetration resistance. These relationships are interpreted in such a way that for given penetration resistance, the liquefaction resistance increases as non-plastic fines content (FC) increases. However, several studies have indicated discrepancies in this relationship. Hence, there is a lag in rational scientific understanding of this observation. In this study, an experimental research program was undertaken to investigate the CPT-based liquefaction assessment by considering the effects of drainage conditions on the relationship between CPT resistance and liquefaction resistance. First, clean sand and silty sands having 5, 15, and 35% FC were tested at different relative densities by stress-controlled cyclic direct simple shear (CDSS) tests to investigate cyclic resistance of silty sand with varying amounts of non-plastic fines. Then, a set of tests involving piezocone penetration (CPTu), seismic CPTu (SCPTu), and direct push permeability (DPPT) were undertaken in a large-scale box filled with the same soils used in the CDSS tests. The large-scale test results quantified the effect of drainage conditions (coefficient of consolidation) on cone penetration resistance. Finally, by combining the CDSS and CPTu test results, an alternative CPT-based liquefaction resistance relationship was proposed by considering the effects of drainage conditions.