Consolidation settlement calculation and examination of the foundation settlements with finite elements method, example of Batman city Gültepe bridge

Öz

In this study, geological and geotechnical studies were carried out on the soil of a bridge built in 2015 in the Gültepe District of Batman City, located in southeastern Turkey, to perform the foundation settlement calculation. For this purpose, four foundation boreholes were drilled to determine the engineering parameters of the soil, and triaxial pressure and consolidation tests were carried out on the obtained samples. The consolidation settlement calculation was made in accordance with these parameters. Using the same data, numerical analysis was performed with PLAXIS 2D, a two-dimensional finite element package program. The consolidation settlement value was calculated by performing dynamic analysis based on time in the computer software. The settlement value was determined to be 1.70 cm after the analysis, and it was evaluated by correlating with the consolidation settlement analysis results made according to Bowles (1988). Consolidation settlement calculations and finite element package program analyses gave similar results. The Bored Pile technique, which is one of the soil improvement methods, was applied and discussed in order to determine the geological problems in the study field.

Anahtar Kelimeler

• Bridge
• Consolidation settlement
• Finite Element Method

Consolidation settlement calculation and examination of the foundation settlements with finite elements method, example of Batman city Gültepe bridge

Abstract

In this study, geological and geotechnical studies were carried out on the soil of a bridge built in 2015 in the Gültepe District of Batman City, located in southeastern Turkey, to perform the foundation settlement calculation. For this purpose, four foundation boreholes were drilled to determine the engineering parameters of the soil, and triaxial pressure and consolidation tests were carried out on the obtained samples. The consolidation settlement calculation was made in accordance with these parameters. Using the same data, numerical analysis was performed with PLAXIS V.8.2 (Finite Element Code for Soil and Rock Analyses), a two-dimensional finite element package program. The consolidation settlement value was calculated by performing dynamic analysis based on time in the computer software. The settlement value was determined to be 1.70 cm after the analysis, and it was evaluated by correlating with the consolidation settlement analysis results made according to Bowles (1988). Consolidation settlement calculations and finite element package program analyses gave similar results. We observed liquefaction risk and settlements in the structures with shallow foundations in the residential zone near the study area since the soils in the study area consist of silty sand of 5-10 meters and have groundwater. The Bored Pile technique, which is one of the soil improvement methods, was applied and discussed in order to determine the geological problems in the study field.

Keywords

• Bridge
• consolidation settlement
• finite elements methods
• foundation settlement
• PLAXIS

Kaynakça

1. 1. B. Canik, Engineering Geology Lecture Notes, Ankara: Ankara University Faculty of Science Department of Geology Engineering, 1997.
2. 2. M. Yıldırım and E. Gökaşan, Geology Information for Engineerings, Expanded 2nd Edition, İstanbul: Yıldız Teknik University Publishing, 2013.
3. 3. R. B. J. Brinkgreve, W. Broere, and D. Waterman, PLAXIS Finite Element Code for Soil and Rock Analysis. 2d –Version 8.6., The Netherlands: Delft University of Technology & Plaxis, 2004.
4. 4. S. Sert, A. Önalp and E. Arel, “Effect of Change in Soil Properties on Results in Numerical Analysis”, Thirteenth National Congress of Soil Mechanics and Foundation Engineering, İstanbul Kültür University, İstanbul, 471-482, (2010).
5. 5. E. Subaşı, B. İkizler, G. Demir, Z. Angın and A. Kayahan, “An Evaluation on Landslides (Example of Rize Province)”, Fourteenth National Congress of Soil Mechanics and Foundation Engineering, Süleyman Demirel University, Isparta, 337-346, (2012).
6. 6. S. N. Keskin, and A. Cengizhan, “Comparison of the Traditional Method and Finite Element Method in Basic Settlement Calculations”, Journal of Engineering Sciences and Design, vol. 7, no 1, pp. 136-144, 2019.
7. 7. Ş. Adatepe, A. Gökalp and R. Düzceer, “Performance of Different Braces in a Deep Excavation Application in Istanbul Graywackes”, Fourteenth National Congress of Soil Mechanics and Foundation Engineering, Süleyman Demirel University, Isparta, 431-442, (2012).
8. 8. O. Enkhtur, T. D. Nguyen, J. M., Kim and S. R. Kim, “Evaluation of Settlement Influence Factors of Shallow Foundation by Numerical Analyses”, KSCE Journal of Civil Engineering, vol. 17, no 1, pp. 85-95, 2013.

9. 9. G. Mısır and M. Laman, “Examination of Circular Foundations on Stratified Soils by Tests and Analytical Method”, Çukurova University Faculty of Engineering and Architecture Journal, vol. 30, no 19, pp. 249-256, 2015.
10. 10. M. Sunkar and S. Tonbul, “Geomorphology Iluh Stream of River Basin Batman, Istanbul University Faculty of Literature Department of Geography, Journal of Geographical, vol. 24, pp. 38-60, 2013.
11. 11. Y. Eren, M. T. Nalbantçılar, T. Beyaz, S. Dinç, M. Ünal, Ş. Arslan and S. Polat, “Tectonism of Esentepe (Gültepe/Batman) Hole”, Batman University Journal of Life Sciences, vol. 1, no 2, pp. 385-394, 2012.
12. 12. T. Bolgi, “V. Petrol Region Section Measurements Structural Studies between the Field Numbered AR/TPO/261 and the Field West of Reşan-Dodan”, Turkish Petroleum Corporation Research Group, Report No: 162, Ankara, (1961).
13. 13. D. Tuna, “Explanatory Report of Lithostratigraphic Units in Region IV”, TPAO Search Group, Archive No. 813, (1973).
14. 14. D. Perinçek, “The Geological Examination of Çelikhan-Sincik-Koçali (Adıyaman) Area”, TPAO Search Group, Report No: 1395, (1979).
15. 15. Y. Yılmaz, “The Tectonics of Amonos Mountains”, TPAO Search Group, Report No: 1653, Ankara, (1982).
16. 16. K. Terzaghi and R. B. Peck, Soil Mechanics in Engineering Practice, New York: John Wiley & Sons, 1948.
17. 17. J. E. Bowles, Foundation Analysis and Design, 4th Edition, Singapore: McGrawHill, 1988.
18. 18. B. H. Fellenius, Basics of Foundation Design Electronic, Vero Beach: Pile Buck International Inc., 2019.
19. 19. R. B. J. Brinkgreve, “Plaxis Finite Element Code for Soil and Rock Analysis, 2d Version 8.2”, 2002.