Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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

Browse

Filters

2022 - 20256

Settings

Author: search.filters.author.Ecemis, Nurhan

Search Results

Now showing 1 - 6 of 6
  • Article
    Performance of Sheet Pile Walls With Rubber-Modified Backfill
    (Springer, 2025) Ecemis, Nurhan; Kadekeshova, Kuralay; Khlaif, Ali Hamid
    This study investigates the behavior of clean sand and sand-rubber mixtures used as backfill materials behind sheet pile walls under vertical loads. Physical model experiments were conducted to assess lateral displacement and pressure for backfills containing 10% granulated rubber (2.5-5 mm) under both dry and saturated conditions, and across varying backfill inclination angles. To complement the experiments, discrete element method (DEM) simulations were performed to capture the micromechanical behavior of sand-rubber mixtures, enabling analysis of particle-scale interactions. Material stiffness and friction parameters were calibrated through direct shear tests to ensure computational efficiency and accurate representation. Comparative analyses were conducted between the DEM simulations and the physical sheet pile tests across various sand-rubber backfill configurations. The results suggest that sand-rubber mixtures offer a practical and sustainable alternative for backfill applications, improving both mechanical performance and pressure mitigation. Furthermore, force chain development and deformation patterns were thoroughly examined to understand the role of micro parameters; such as particle contact behavior, porosity, internal friction, and stiffness of the rubber-sand composite backfill in reducing active earth pressure against sheet pile walls.
  • Article
    Citation - WoS: 3
    Citation - Scopus: 3
    Assessment of Seismic Liquefaction and Structural Instability in Adiyaman-Golbasi After the February 6, 2023, Earthquakes in Türkiye
    (Elsevier Sci Ltd, 2025) Ecemis, Nurhan; Dalgıç, Korhan Deniz; Donmez, Cemalettin; Karaman, Mustafa; Karaman, Mustafa; Dönmez, Cemalettin; Valizadeh, Hadi; Ecemiş, Nurhan; Dalgic, Korhan Deniz
    Two earthquakes, Mw = 7.8 Kahramanmaras,-Pazarcik, and Mw = 7.6 Elbistan, occurred on February 6, 2023, approximately 9 h apart. These earthquakes caused devastating effects in a total of 11 nearby cities on the east side of T & uuml;rkiye (Adana, Adiyaman, Diyarbakir, Elazig, Gaziantep, Hatay, Kahramanmaras,, Kilis, Malatya, Osmaniye, and S,anliurfa) and the north side of Syria. These earthquakes provided an outstanding prospect to observe the effects of liquefaction in silty sand and liquefaction-like behavior in clays (cyclic softening) on the stability of structures. This paper specifically presents the post-earthquake reconnaissance at three sites and evaluations of four buildings within these sites in Adiyaman Province, Golbas, i District. First, important role of post-earthquake piezocone penetration test (CPTu) in characterizing the subsurface conditions was presented. Then, the effect of soil liquefaction and cyclic softening on the performance of four buildings during the earthquakes was evaluated. These structures represent the typical new reinforced concrete buildings in T & uuml;rkiye with 3 to 6-story, situated on shallow (raft) foundations, and demonstrated diverse structural performances from full resilience to moderate and extensive damage during the aforementioned earthquakes. Based on the interim findings from these sites, the potential factors that caused moderate to severe damage to buildings were inspected, and preliminary-immediate insights were presented on the relationship between structural design, soil properties, and the performance of buildings with shallow foundations.
  • Article
    Investigation of Earth Dam Filter Performance Under Static and Dynamic Loading Conditions
    (Amer Soc Testing Materials, 2024) Valizadeh, Hadi; Ecemis, Nurhan; Leclerc, Rabia Zeynep Sarica
    Erosion -induced piping is the primary cause of failure in embankment dams' ' bodies and foundations. The filter is a principal part of an earth dam, owing to the crucial role of this layer in protecting the clayey core from erosion. Erosion is the process by which soil particles migrate due to an interior fluid flow and is recognized as a significant hazard for earthen constructions. Designing a proper filter -soil system can regulate and seal undesirable cracks that may form in the impermeable core due to nonuniform settlements, extreme water levels, or earthquakes. In this study, a No -Erosion Filter (NEF) test device, which still seems to be the most reliable filtersoil system design, has been adapted to evaluate the performance of the filter sand of two dams under static and dynamic loading conditions. The outcomes were compared with the several filter design criteria in the literature, and it was found that the filter's design approach using the available criteria may not always align with the NEF test results. Therefore, a precise understanding of fluid-particle -particle interactions is necessary to design and operate earth dam filters. The dynamic excitation can change hole pressure distribution and cause erosion even after steady-state conditions under static situations. Consequently, the effectiveness of filters under static conditions does not necessarily translate to satisfactory performance when exposed to dynamic loading.
  • 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.