Bodrum Kazısının Şev Stabilite Değerlendirmesi: Vaka Analizi

Abstract

Bir derin kazı işleminin komşu parsellerdeki alt ve üst yapı unsurlarında veya arsalarda herhangi bir stabilite kaybına ve yapısal hasarlara neden olmaması, inşaat işçi sağlığı ve güvenliği riski yaratmaması için önlemleriyle birlikte projelendirilmesi ve uygulanması gerekmektedir. Bu çalışma, temel kazısı nedeniyle oluşabilecek zemin hasarlarının bir örneğini temsil etmektedir. Kazı ile etkilenen zeminin özellikleri jeolojik araştırma yoluyla analiz edilmiştir ve farklı analiz aşamalar için zemin modelleri oluşturulmuştur. Çalışma, yaygın olarak kullanılan limit denge (LE) yöntemleriyle temel kazısında meydana gelebilecek şev stabilitesi analizlerini ele almaktadır. Bu makalede İstanbul Sarıyer ilçesi İstinye Mahallesi'ndeki 3 katlı bir okul binasının bodrum katının inşasından önce kazı çevresinde meydana gelebilecek şev problemleri incelenmiştir. Bölgeye ait detaylı sondaj raporları alınarak geoteknik ve yapısal parametreler belirlenmiş, çalışma alanı limit denge yöntemine dayalı Rocscience Slide 6.0 programı ile modellenerek bodrum kazıları değerlendirme sonucunda kazı sonrası bodrum inşası güvenliği için şevli kazı yapılmıştır ve şevli kazıların stabilite analizi sonucu eğim güvenliğinin yeterli olduğu tespit edilmiştir.

Keywords

• Limit denge yöntemi
• Şev stabilite analizi
• Kazı
• Okul inşaatı

Slope Stability Evaluation of Basement Excavation: A Case Study

Abstract

A deep excavation should be designed and implemented together with the precautions to prevent any loss of stability and structural damage in the infrastructure and superstructure elements of the neighboring parcels and risks against construction worker's health and safety. This study represents an example of soil damage that may occur due to foundation excavation. The features of the soil affected by the excavation were analyzed through a geological survey and soil models were created for each analysis stages. The study investigates the slope stability analyses that take place during the foundation excavation with the commonly used limit equilibrium (LE) methods. In this article, slope problems that may occur around the excavation before the construction of the basement of a 3-storey school building in Istinye Neighborhood of Istanbul Sarıyer district are examined. First, geotechnical and structural parameters were determined by obtaining detailed drilling reports of the region. Then the study area was modeled with the Rocscience Slide 6.0 program based on the limit equilibrium method. Following the evaluation of the basement excavations, a beveled excavation was made for the safety of the basement construction after the excavation and the stability of the slope excavations was found to be sufficient.

Keywords

• Limit equilibrium method
• Slope stability analysis
• Excavation
• School construction

References

1. [1] M. Erdik and E. Durukal, “Earthquake risk and its mitigation in Istanbul,” Natural Hazards, vol. 44, no. 2, pp. 181-197, 2008.
2. [2] B. Torus and N. Aydın, “Urban transformation in Istanbul,” 4th International Conference Archi-Cultural Interactions, Nishinomiya, Japan, July 16-18, 2016.
3. [3] R. Lutton, “A mechanism for progressive rock mass failure as revealed by loess slumps,” International Journal of Rock Mechanics and Mining Sciences and Geomechanics, vol. 8 no. 2, pp. 143-149, 1971.
4. [4] B. Burland, T. Longworth and F. Moore, “A study of ground movement and progressive failure caused by a deep excavation in Oxford Clay,” Géotechnique, vol. 14 no. 6, pp. 557-591, 1977.
5. [5] A Ö. Erçin, “Slope Stability and Engineering Applications,” M.S. thesis, Department of Civil Engineering, Erciyes University, Kayseri, Turkey, 2007.
6. [6] D. Varnes, “Slope movements: types and processes in Schuster,” Landslides, vol. 36 no. 3, pp. 11-33, 1978.
7. [7] D. Cruden and M. Varnes, “Landslides types and processes,” Landslides, vol. 201, no. 4, pp. 36-57, 1996.
8. [8] P. Canuti, P. Focardi and C. Garzoni, “Correlation between rainfall and landslides,” Bulletin of Engineering Geology and the Environment, vol. 32, no. 8, pp. 49-54, 1985.

9. [9] J. Corominas and J. Moya, “Reconstructing recent landslide activity in relation to rainfall in the Llobregat River basin,” Geomorphology, vol. 32, no. 21, pp. 79-93, 1999.
10. [10] C. Zhou, C. Lee, J. Li and Z. Xu, “On the relationship between landslides and causative factors on Lantau Island, Hong Kong,” Geomorphology, vol. 43, no. 4, pp. 197-207, 2002.
11. [11] Q. Zaruba and V. Mencl, Landslides and Their. Control. Amsterdam, NX: Elsevier.1982.
12. [12] F. Zhang, G. Liu, W. Chen, S. Liang, R. Chen and W. Han, “Human-induced landslide on a high cut slope: a case of repeated failures due to multi-excavation,” Journal of Rock Mechanics and Geotechnical Engineering, vol. 4, no. 4, pp. 367-374, 2012.
13. [13] A. E. Erginal, M. Türkeş, T. A. Ertek, A. Baba and C. Bayraktar, “Geomorphological investigation of the excavation-induced Dündar landslide, Bursa – Turkey,” Physical Geography, vol. 6, no. 2, pp. 109-123, 2008.
14. [14] M. Li, G. Zhang and Y. Hu, “Centrifuge model tests on excavation-induced failure of slopes,” Rock and Soil Mechanics, vol. 31 no. 2, pp. 366-370, 2010.
15. [15] J. Wang, Y. Liang and H. Zhang, “A loess landslide induced by excavation and rainfall,” Landslides, vol.11, no. 1, pp. 141-152, 2014.
16. [16] S. Mohammadi and H. Taiebat, “Finite element simulation of an excavation-triggered landslide using large deformation theory,” Engineerin Geology, vol. 205, no. 8, pp. 62-72, 2016.
17. [17] Y. Sutejoa and G. Nurly, “Effect of area development on the stability of cut slope,” The 5th International Conference of Euro Asia Civil Engineering, Surabaya, Indonesia, Sep. 15-18, 2015.
18. [18] Google Maps. (2020, Nov 14). School location image [Online]. Available:https://www.google.com/earth.
19. [19] R. Korkmaz and M. Tekin, “İstanbul İl Alanının Jeolojisi,” İstanbul Büyükşehir Belediyesi Deprem Risk Yönetimi ve Kentsel İyileştirme Daire Başkanlığı, Rap.12, 2011.
20. [20] Y. Hayata, NII-Electronic library service. Chemical Pharmaceutical Bulletin, vol. 43, no. 56, pp. 2091-2016, 2002.
21. [21] S. S. Tezcan, A. Keceli and Z. Ozdemir, “Allowable bearing capacity of shallow foundations based on shear wave velocity,” Geotechnical and Geological Engineering, vol. 21, no. 1, pp. 203-218, 2006.
22. [22] Rocscience Slide 6.0, Computer Software, Toronto (ON), 2014.
23. [23] B. Georges, H. Shimizu and S. Nishimura, “Residual strength of colluvium and stability analysis of farmland slope,” The Commission International Du Genie Rural Journal, vol. 14, no. 2, pp. 1-12, 2001.
24. [24] J. Han and D. Leshchinsky, “Limit equilibrium and continuum mechanics-based numerical methods for analyzing stability of mse walls,” 17th ASCE Engineering Mechanics Conference, Newark, United States, Jun 12-16, 2004.
25. [25] D. G. Fredlund and R. E. Scoular, “Using limit equilibrium concepts in finite element slope stability analysis,” Slope Stability Engineering, vol. 35, no. 25, pp. 31-47, 1999.
26. [26] R. W. Day, “State of the art: Limit equilibrium and finite-element analysis of slopes,” Journal of Geotechnical and Geoenvironmental Engineering, vol. 123, no. 9, pp. 894-899, 1997.
27. [27] M. Rabie, “Comparison study between traditional and finite element methods for slopes under heavy rainfall,” HBRC Journal, vol. 10, no. 2, pp. 160-168, 2014.
28. [28] K. Baba, L. Bahi, O. Latifa and A. Akhssas, “Slope stability evaluations by limit equilibrium and finite element methods applied to a railway in the moroccan rif,” Open Journal of Civil Engineering, vol. 5, no. 2, pp. 12-27, 2012.
29. [29] Z. S. Mansour and B. Kalantari, “Traditional methods vs. finite difference method for computing safety factors of slope stability,” Electronic Journal of Geotechnical Engineering, vol. 18, no. 6, pp. 1119-1130, 2011.
30. [30] J. M. Duncan and S. G. Wright, Soil strength and slope stability, John Wiley and Sons, Eds. New Jersey: Hoboken Press, 2005, pp. 205-220.
31. [31] Geo-Slope International Ltd. SLOPE/W user’s manual. Version 4.0. Copyright. Geo-Slope International Ltd., Calgary, Alta. 2001, pp. 1991–2001.