Investigation of the Uplift Capacity of Group Anchor Plates in Geogrid-Reinforced Sand

Year 2016, Volume: 31 Issue: 2, 257 - 268, 15.12.2016

Buse Emirler , Mustafa Tolun , Mustafa Laman

https://doi.org/10.21605/cukurovaummfd.310294

Abstract

In this study, the uplift capacity of group anchors has been investigated in sand with and without geogrid reinforcement experimentally and numerically. While the investigated parameters are the effect of embedment ratio of anchors and number of geogrid layers for a single anchor plate and 2x2 anchor configuration, the constant parameters are spacing ratio between anchors, depth of the first layer of geogrid, vertical spacing ratio of geogrid layers and length of geogrid. Experimental studies have been modelled and analyzed with Plaxis 3D which is a finite elements software. The results obtained from both of the studies have been compared and the validity of the numerical analysis has been investigated on the uplift capacity of anchor plate. As a result, it was shown that depending on the reinforcement geogrid, the uplift capacity of anchor plate can be improved by up to 2 times that of the unreinforced sand.

Keywords

Laboratory test, Numerical analysis, Uplift capacity, Anchor plate, Geogrid

Geogrid Donatılı Kumda Grup Ankraj Plakalarının Çekme Kapasitesinin İncelenmesi

Abstract

Bu çalışmada, geogridle güçlendirilmiş ve güçlendirilmemiş kum zemindeki grup ankrajların çekme kapasitesi deneysel ve sayısal olarak incelenmiştir. Tek ve 2x2 yerleşim düzenindeki ankraj plakalarında gömülme oranı ve geogrid tabakası sayısının çekme kapasitesine etkisi araştırılırken, ankrajlar arası mesafe oranı, geogrid tabakasının ilk derinliği, geogrid tabakaları arası düşey mesafe ve geogrid tabakasının uzunluğu sabit tutulmuştur. Deneyler sonlu elemanlar programına dayalı Plaxis 3D bilgisayar programı ile sayısal olarak modellenmiş ve analiz edilmiştir. Deneysel çalışmalar ve sayısal analizlerden elde edilen sonuçlar karşılaştırılmış ve sayısal analizin ankraj plakasının çekme kapasitesini tahminindeki başarısı araştırılmıştır. Sonuç olarak, geogridle güçlendirmenin ankraj plakasının çekme kapasitesini 2 kata kadar artırdığı görülmüştür.

Keywords

Laboratuvar deneyi, Sayısal analiz, Çekme kapasitesi, Ankraj plakası, Geogrid

References

• 1. Emirler, B., 2013. Grup Ankrajların Çekme Davranışının İncelenmesi,Yüksek Lisans Tezi, Çukurova Üniversitesi, Adana.
• 2. Balla, A., 1961. The Resistance of Breaking-Out of Mushroom Foundations for Pylons, 5th International Conference Soil Mechanics and Foundation Engineering, pp. 569-576.
• 3. Meyerhof, G.G., Adams, J.I., 1968. The Ultimate Uplift Capacity of Foundations, Can. Geotech. J., Vol. 5, No. 4, 225-244.
• 4. Rowe, R.K., Davis, E.H., 1982. The Behaviour of Anchor Plates in Sand, Geotechnique, Vol. 32, No. 1, 25-41.
• 5. Murray, E.J., Geddes, J.D., 1987. Uplift of Anchor Plates in Sand, J. Geotech. Eng., Vol. 113, No. 3, 202-215.
• 6. Rao, K., Kumar, J., 1994. Vertical uplift Capacity of Horizontal Anchors, J. Geotech. Eng., Vol. 120, No. 7, 1134-1147.
• 7. Smith, C.C., 1998. Limit Loads for an Anchor/Trapdoor Embedded in an Associated Coulomb Soil, Int. J. Numer. Anal. Methods Geomech., Vol. 22, No. 11, 855-865.
• 8. Merifield, R., Sloan, S.W., 2006. The Ultimate Pullout Capacity of Anchors in Frictional Soils, Can. Geotech. J., Vol. 43, No. 8, 852-868.
• 9. Samui, P., Sitharam, T.G., 2009. Pullout Capacity of Mmall Ground Anchors: A Relevance Vector Machine Approach, Geomech. Eng., Int. J., Vol. 1, No. 3, 259-262.
• 10. Kame, G.S., Dewaikar, D.M., Cohudhurry, D., 2006. Pull Out Capacity of Vertical Plate Anchors in Cohesionless Soil, Geomech. Eng., Int. J., Vol. 4, No. 2, 105-120.
• 11. Das, B.M., Seeley, G.R., 1975. Breakout Resistance of Shallow Horizontal Anchors, J. Geotech. Eng., Vol. 101, No. 9, 999-1003.
• 12. Rowe, R.K., 1978. Soil Structure Interaction Analysis and Its Application to the Prediction of Anchor Behavior. Ph.D. Thesis; University of Sydney, Australia.
• 13. Ovesen, N.K., 1981. Centrifuge Tests of the Uplift Capacity of Anchors, 10th International Conference on Soil Mechanics and Foundation Engineering, pp. 717-722.
• 14. Dickin, E.A., 1988. Uplift behavior of Horizontal Anchor Plates in Sand, J. Geotech. Eng., Vol. 114, No. 11, 1300-1317.
• 15. Murray, E.J., Geddes, J.D., 1989. Resistance of Passive Inclined Anchors in Cohesionless Medium, Geotechnique, Vol. 39, No. 3, 417-431.
• 16. Dickin, E.A., Laman, M., 2007. Uplift Response of Strip Anchors in Cohesionless Soil, J. Adv. Eng. Softwares, Vol. 38, 618-625.
• 17. Bildik, S. and Laman, M., 2011. Experimental Investigations on Uplift Behaviour of Plate Anchors in Cohesionless Soil, J. Fac. Eng. Archit. Gazi Uni., Vol. 26, No. 2, 486-496.
• 18. Bera, A.K., 2014. Parametric Study on Uplift Capacity of Anchor with Tie in Sand, KSCE J. Civ. Eng., Vol. 18, No. 4, 1028-1035.
• 19. Zhu, H.H., Mei, G.X., Xu, M., Yin, J.H., 2014. Experimental and Numerical Investigation of Uplift Behavior of Umbrella-Shaped Ground Anchor. Geomech. Eng., Int. J., Vol. 7, No. 2, 165-181.
• 20. Keskin, M.S., 2015. Model Studies of Uplift Capacity Behavior of Square Plate Anchors in Geogrid-Reinforced Sand. Geomechanics and Engineering, Vol. 8, No. 4, 595-513.
• 21. Ilamparuthi, K., Ravichandran, P.T., Mohammed Toufeeq, M., 2008. Study on Uplift Behaviour of Plate Anchor in Geogrid Reinforced Sand Bed, Geotechnical Eartquake and Engineering and Soil Dynamics IV Congress, pp. 1-10.
• 22. Niroumand, H., Kassim, K.A., Nazir, R., 2013. The Influence of Soil Reinforcement on the Uplift Response of Symmetrical Anchor Plate Embedded in Sand, Measurement, Vol. 46, No. 10, 2608-2629.
• 23. Niroumand, H., Kassim, K.A., 2014. Uplift Response of Symmetrical Anchor Plates in Reinforced Cohesionless Soil, Arab. J. Geosci., Vol. 7, No. 9, 3755-3766.
• 24. PLAXIS 3D Tunnel. Geotechnical Finite Element Software. Delft, The Netherlands.