Düşük Deformasyon Seviyelerinde Kumların Dinamik Özelliklerinin Resonant Kolon Deneyi Yardımıyla Belirlenmesi

Yıl 2020, , 572 - 580, 31.05.2020

Ersin Güler , Kamil Bekir Afacan

https://doi.org/10.31202/ecjse.678440

Öz

Zeminlerin dinamik özelliklerinin belirlenmesi geoteknik mühendisleri için önemlidir. Depremler nedeniyle zeminlerin gerilme-deformasyon ve mukavemet özellikleri değişmektedir. Bunun sonucunda, zeminlerde deformasyonlar meydana gelmekte ve yapısal hasarlar oluşmaktadır. Deprem bölgelerinde inşa edilecek yapılar için zeminlerin dinamik özelliklerinin belirlenmesi büyük önem taşımaktadır. Meydana gelebilecek hasarların en aza indirilmesi için zeminlerin tekrarlı yükler altında göstereceği davranışın bilinmesi ve tasarımında dikkate alınması gerekmektedir. Bu amaç doğrultusunda farklı kum numunelerinin dinamik özelliklerinin belirlenmesi üzerine çalışma yapılmıştır. Rezonant kolon deney sistemi ile küçük deformasyon seviyelerinde elde edilen veriler değerlendirilmiştir. Yapılan deneyler sonucunda farklı özelliklerdeki numunelere ait kayma modülü ve sönüm oranı eğrileri elde edilmiş ve farklılıklar ve benzerlikler tartışılmıştır.

Anahtar Kelimeler

Rezonat kolon, Dinamik Özellikler, Kayma Modülü, Sönüm Oranı

Evaluation of Dynamic Properties of Sands with Low Deformation Levels Determined by Resonant Column Test

Öz

Determining the dynamic properties of soils is important for geotechnical engineers. Stress-deformation and strength properties of soils change due to earthquakes. As a result, deformations occur in the soil and structural damage develop. Determining the dynamic properties of soils is of great importance for the structures to be built in earthquake zones. In order to minimize the possible damages, the behavior of the soils under cyclic loads should be determined and taken into consideration in design. For this purpose, different sand samples were tested to understand the dynamic properties of soil. In the study, experiments were carried out using the resonant column test system in order to determine dynamic behavior at the small deformation levels of the clayey sand samples obtained from site with Toyoura sand widely used in the literature. As a result of the experiments, the shear modulus and damping ratio curves of the samples with different properties were obtained and differences and similarities were discussed.

Anahtar Kelimeler

Resonant column, Dynamic properties

Kaynakça

• Referans1: Okur, D.V., Ansal, A., Stiffness Degradation of Natural Fine Grained Soils During Cyclic Loading, Soil Dyn Earthq Eng, 2007, 27, 843–54.
• Referans2: Dobry, R., Vucetic, M., Dynamic Properties and Seismic Response of Soft Clay Deposits. Int Symp Geotech Eng Soft Soils, Ciudad México 1987, 51–87.
• Referans3: Darendeli, MB., Development of a New Family of Normalized Modulus, 2001.
• Referans4: Baziar, MH., Ghorbani, A., Katzenbach, R. Small-scale Model Test and Three-Dimensional Analysis of Pile-Raft Foundation on Medium-Dense Sand. Int J Civ Eng, 2009, 7, 170–5.
• Referans5: Subramaniam, P., Banerjee, S., Torsional Shear and Resonant Column Tests on Cement Treated Marine Clay. Indian Geotech J, 2016, 46, 183–91.
• Referans6: Dutta, TT., Saride, S., Jallu, M., Effect of Saturation on Dynamic Properties of Compacted Clay in a Resonant Column Test. Geomech Geoeng, 2017, 12, 181–90.
• Referans7: Li, H., Senetakis, K., Effects of Particle Grading and Stress State on Strain-Nonlinearity of Shear Modulus and Damping Ratio of Sand Evaluated by Resonant-Column Testing. J Earthq Eng, 2018, 1–27.
• Referans8: Im, J., Tran, A.T.P., Chang, I., Cho, G.C., Dynamic Properties of Gel-Type Biopolymer-Treated Sands Evaluated by Resonant Column (RC) Tests. Geomech Eng, 2017, 12, 815–30.
• Referans9: Khan, Z., El Naggar, M.H., Cascante, G., Frequency Dependent Dynamic Properties from Resonant Column and Cyclic Triaxial Tests. J Franklin Inst, 2011, 348, 1363–76.
• Referans10: Houbrechts, J., Schevenels, M., Lombaert, G., Degrande, G., Rucker, W., Cuellar, V., et al. RIVAS WP1.1 Test Procedures for the Determination of the Dynamic Soil Characteristics, 2011, 1–107.
• Referans11: Umut, S., Volkan, D., Yilmaz, G., Firat, S. Dinamik Yükleme Şartlarında Kum / Lastik Karışımlarının Rijitlik ve Sönüm Özelliklerinin İncelenmesi. 2014, 1, 13–21.
• Referans12: Pistolas, G.A., Anastasiadis, A., Pitilakis, K., Dynamic Behaviour of Granular Soil Materials Mixed with Granulated Rubber: Effect of Rubber Content and Granularity on the Small-Strain Shear Modulus and Damping Ratio. Geotech Geol Eng, 2018, 36, 1267–81.
• Referans13:http://www.utest.com.tr/tr/20365/Tam-Otomatik-Resonant-Kolon-ve-Burgusal-Kesme-Sistemi (02.01.2020).
• Referans14: Morsy, A.M., Salem, M.A., Elmamlouk, H.H., Evaluation of Dynamic Properties of Calcareous Sands in Egypt at Small and Medium Shear Strain Ranges, Soil Dyn Earthq Eng, 2019, 116, 692–708.
• Referans15: Banerjee, S., Balaji, P., Effect of Anisotropy on Cyclic Properties of Chennai Marine Clay. Int J Geosynth Gr Eng, 2018, 4, 1–11.
• Referans16: Bedr, S., Mezouar, N., Verrucci, L., Lanzo, G., Investigation on Shear Modulus and Damping Ratio of Algiers Marls Under Cyclic and Dynamic Loading Conditions. Bull Eng Geol Environ, 2019, 78, 2473–93.
• Referans17: Menq, F.Y., Dynamic Properties of Sandy and Gravelly Soils (Ph.D. Dissertation). University of Texas, Austin, USA, 2003.