DOI QR코드

DOI QR Code

Uplift response of multi-plate helical anchors in cohesive soil

  • Demir, Ahmet (Department of Civil Engineering, Osmaniye Korkut Ata University) ;
  • Ok, Bahadir (Department of Civil Engineering, Adana Science and Technology University)
  • 투고 : 2014.07.11
  • 심사 : 2015.01.16
  • 발행 : 2015.04.25

초록

The use of helical anchors has been extensively beyond their traditional use in the electrical power industry in recent years. They are commonly used in more traditional civil engineering infrastructure applications so that the advantages of rapid installation and immediate loading capability. The majority of the research has been directed toward the tensile uplift behaviour of single anchors (only one plate) by far. However, anchors commonly have more than one plate. Moreover, no thorough numerical and experimental analyses have been performed to determine the ultimate pullout loads of multi-plate anchors. The understanding of behavior of these anchors is unsatisfactory and the existing design methods have shown to be largely inappropriate and inadequate for a framework adopted by engineers. So, a better understanding of helical anchor behavior will lead to increased confidence in design, a wider acceptance as a foundation alternative, and more economic and safer designs. The main aim of this research is to use numerical modeling techniques to better understand multi-plate helical anchor foundation behavior in soft clay soils. Experimental and numerical investigations into the uplift capacity of helical anchor in soft clay have been conducted in this study. A total of 6 laboratory tests were carried out using helical anchor plate with a diameter of 0.05 m. The results of physical and computational studies investigating the uplift response of helical anchors in soft clay show that maximum resistances depend on anchor embedment ratio and anchor spacing ratio S/D. Agreement between uplift capacities from laboratory tests and finite element modelling using PLAXIS is excellent for anchors up to embedment ratios of 6.

키워드

참고문헌

  1. ASTM D 2435-96 (1998), Standard test method for one-dimensional consolidation properties of soils; Annual Book of ASTM standards (Volume 04.08), Soil and Rock (I), Standard, PA, USA, pp.207-216.
  2. Brinkgreve, R.B.J. and Vermeer, P.A. (1998), Finite Element Code for Soil and Rock Analyses, A.A. Balkema, Rotterdam, Netherlands.
  3. Das, B.M. (1978), "Model tests for uplift capacity of foundations in clay", Soil. Found., 18(2), 17-24. https://doi.org/10.3208/sandf1972.18.2_17
  4. Das, B.M. (1980), "A procedure for estimation of ultimate uplift capacity of foundations in clay", Soil. Found., 20(1), 77-82. https://doi.org/10.3208/sandf1972.20.77
  5. Demir, A., Laman, M., Yildiz, A. and Ornek, M. (2013), "Large scale field tests on geogrid-reinforced granular fill underlain by clay soil", 38, 1-15. https://doi.org/10.1016/j.geotexmem.2012.05.007
  6. Dickin, E.A. and Nazir, R. (1999), "Moment carrying capacity of short pile foundations in cohesionless soil", J. Geotech. Geoenviron. Eng., ASCE, 125(1), 1-10. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:1(1)
  7. Ghaly, A., Hanna, A. and Hanna, M. (1991), "Uplift behavior of screw anchors in sand", J. Geotech. Eng. Div. ASCE, 117(5), 773-793. https://doi.org/10.1061/(ASCE)0733-9410(1991)117:5(773)
  8. Hoyt, R.M. and Clemence, S.P. (1991), "Uplift capacity of helical anchors in soil", Proceedings 12th International Conference on Soil Mechanics and Foundation Engineering [Comptes Rendus du Congres International de Mecanique des Sols et des Travaux de Fondations], Volume 2, A.A. Balkema Publishers, Rotterdam, Netherlands, pp. 1019-1022.
  9. Kaya, N. and Ornek, M. (2013), "Experimental and numerical studies of t-shaped footings", Acta Geotechnica Slovenica, 1, 43-58.
  10. Laman, M. and Yildiz, A. (2007), "Numerical studies of ring foundations on geogrid-reinforced sand", Geosynth. Int., 14(2), 1-13. https://doi.org/10.1680/gein.2007.14.1.1
  11. Lutenegger, A.J., Smith, B.L. and Kabir, M.G. (1988), "Use of in situ tests to predict uplift performance of multi helix anchors", (GSP 16), Special topics in foundations ASCE, New York, NY, USA, pp. 93-110.
  12. Merifield, R.S. (2011), "Ultimate uplift capacity of multiplate helical type anchors in clay", J. Geotech. Geoenviron. Eng., 137(7), 704-716. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000478
  13. Merifield, R.S., Lyamin, A.V., Sloan, S.W. and Yu, H.S. (2003), "Three-dimensional lower bound solutions for stability of plate anchors in clay", J. Geotech. Geoenviron Eng., ASCE, 129(3), 243-253. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:3(243)
  14. Meyerhof, G.G. (1973). "Uplift resistance of inclined anchors and piles", Proceedings of the 8th International Conference on Soil Mechanics and Foundation Engineering [Comptes Rendus du Congres International de Mecanique des Sols et des Travaux de Fondations], Vol. 2:1, A.A. Balkema Publishers, Rotterdam, Netherlands, pp. 167-172.
  15. Meyerhof, G.G. and Adams, J.I. (1968), "The ultimate uplift capacity of foundations", Can. Geotech. J., 5(4), 225-244. https://doi.org/10.1139/t68-024
  16. Mitsch, M.P. and Clemence, S.P. (1985), "Uplift capacity of helix anchors in sand", In: Uplift Behavior Anchor Foundations in Soil, ASCE, pp. 26-47.
  17. Mooney, J.S., Adamczak, S.J. and Clemence, S.P. (1985), "Uplift capacity of helix anchors in clay and silt", In: Uplift Behavior of Anchor Foundations in Soil, ASCE, pp. 48-72.
  18. Narasimha Rao, S., Prasad, Y.V.S.N. and Shetty, M.D. (1991), "The behavior of model screw piles in cohesive soils", Soil. Found., 31(2), 35-50. https://doi.org/10.3208/sandf1972.31.2_35
  19. Narasimha Rao, S., Prasad, Y.V.S.N. and Veeresh, C. (1993), "Behavior of embedded model screw anchors in soft clays" Geotechnique, 43(4), 605-614. https://doi.org/10.1680/geot.1993.43.4.605
  20. Singh, S.P. and Ramaswamy, S.V. (2008), "Contribution of suction force to undrained breakout capacity of plate anchors", International Association for Computer Methods and Advances in Geomechanics, Goa, India, October, pp. 3166-3173.
  21. Vesic, A.S. (1971), "Breakout resistance of objects embedded in ocean bottom", J. Soil Mech. Found. Div., ASCE, 97(9), 1183-1205.
  22. Weikart, A.M. and Clemence, S.P. (1987), "Helix anchor foundations two case histories", (GSP 8), Foundations for Transmission Line Towers ASCE, New York, pp. 72-80.

피인용 문헌

  1. Improvement in uplift capacity of horizontal circular anchor plate in undrained clay by granular column vol.10, pp.5, 2016, https://doi.org/10.12989/gae.2016.10.5.617
  2. Numerical modelling of pullout of helical soil nail vol.9, pp.4, 2017, https://doi.org/10.1016/j.jrmge.2017.01.007
  3. Experimental investigation of the uplift capacity of group anchor plates embedded in sand vol.11, pp.5, 2016, https://doi.org/10.12989/gae.2016.11.5.691
  4. Interaction Effect of Group of Helical Anchors in Cohesive Soil Using Finite Element Analysis vol.35, pp.4, 2017, https://doi.org/10.1007/s10706-017-0188-x
  5. Bearing capacity of footing supported by geogrid encased stone columns on soft soil vol.12, pp.3, 2017, https://doi.org/10.12989/gae.2017.12.3.417
  6. Pullout resistance of concrete anchor block embedded in cohesionless soil vol.12, pp.4, 2015, https://doi.org/10.12989/gae.2017.12.4.675
  7. Pullout capacity of shallow inclined anchor in anisotropic and nonhomogeneous undrained clay vol.13, pp.5, 2015, https://doi.org/10.12989/gae.2017.13.5.825
  8. Response of square anchor plates embedded in reinforced soft clay subjected to cyclic loading vol.17, pp.2, 2015, https://doi.org/10.12989/gae.2019.17.2.165
  9. Effect of Helical Surface Area on the Performance of a Multi-Helix Anchor vol.18, pp.4, 2020, https://doi.org/10.1007/s40999-019-00490-7