Geomechanics and Engineering

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Development of umbrella anchor approach in terms of the requirements of field application

  • Evirgen, Burak (Department of Civil Engineering, Eskisehir Technical University) ;
  • Tuncan, Ahmet (Department of Civil Engineering, Eskisehir Technical University) ;
  • Tuncan, Mustafa (Department of Civil Engineering, Eskisehir Technical University)
  • Received : 2018.11.05
  • Accepted : 2019.06.04
  • Published : 2019.06.30
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Abstract

In this study, an innovative anchoring approach has been developed dealing with all relevant aspects in consideration of previous works. An ultimate pulling force calculation of anchor is presented from a geotechnical point of view. The proposed umbrella anchor focuses not only on the friction resistance capacity, but also on the axial capacity of the composite end structure and the friction capacity occurring around the wedge. Even though the theoretical background is proposed, in-situ application requires high-level mechanical design. Hence, the required parts have been carefully improved and are composed of anchor body, anchor cap, connection brackets, cutter vanes, open-close ring, support elements and grouting system. Besides, stretcher element made of aramid fabric, interior grouting system, guide tube and cable-locking apparatus are the unique parts of this design. The production and placement steps of real sized anchors are explained in detail. Experimental results of 52 pullout tests on the weak dry soils and 12 in-situ tests inside natural soil indicate that the proposed approach is conservative and its peak pullout value is directly limited by a maximum strength of anchored soil layer if other failure possibilities are eliminated. Umbrella anchor is an alternative to conventional anchor applications used in all types of soils. It not only provides time and workmanship benefits, but also a high level of economic gain and safe design.

Keywords

Acknowledgement

Supported by : Anadolu University

References

  1. ASTM A416/A416M-17a. (2017), Standard Specification for Low-Relaxation, Seven-Wire Steel Strand for Prestressed Concrete, American Society for Testing and Materials, Pennsylvania, U.S.A.
  2. Athani, S., Kharel, P., Airey, D. and Rognon, P. (2017), "Grainsize effect on uplift capacity of plate anchors in coarse granular soils", Geotech. Lett., 7, 167-173. http://dx.doi.org/10.1680/jgele.17.00002.
  3. Aubeny, C. and Chi, C.M. (2014), "Analytical model for vertically loaded anchor performance", J. Geotech. Geoenviron. Eng., 140(1), 14-24. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000979.
  4. Bhattacharya, P. (2017), "Pullout capacity of shallow inclined anchor in anisotropic and nonhomogeneous undrained clay", Geomech. Eng., 13(4), 701-714. https://doi.org/10.12989/gae.2017.13.4.701.
  5. Bhattacharya, P. and Sahoo, S. (2017), "Uplift capacity of horizontal anchor plate embedded near to the cohesionless slope by limit analysis", Geomech. Eng., 13(5), 825-844. https://doi.org/10.12989/gae.2017.13.5.825.
  6. Bowman, K.M. and Smith, J.E. (1966), Umbrella Pile Anchor, Granted Patent No. US3276173A.
  7. Chow, S.H., O'loughlin, C.D., Corti, R., Gaudin, C. and Diambra, A. (2015), "Drained cyclic capacity of plate anchors in dense sand: Experimental and theoretical observations", Geotech. Lett., 5, 80-85. https://doi.org/10.1680/geolett.15.00019.
  8. Consoli, N.C., Ruver, C.A. and Schnaid, F. (2013), "Uplift performance of anchor plates embedded in cement-stabilized backfill", J. Geotech. Geoenviron. Eng., 139(3), 511-517. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000785.
  9. Das, B.M. (1984), Principles of Foundation Engineering, Brooks/Cole Engineering Division, California, U.S.A.
  10. Deshmukh, V.B., Dewaikar, D.M. and Choudhury, D. (2010), "Computations of uplift capacity of pile anchors in cohesionless soil", Acta Geotech., 5(2), 87-94. https://doi.org/10.1007/s11440-010-0111-6.
  11. Evirgen, B. (2017), "Evaluation of bearing capacity and sliding potential with new generation applications in scope of geotechnical engineering", Ph.D. Dissertation, Anadolu University, Eskisehir.
  12. Evirgen, B., Tuncan, A., Tuncan, M. and Onur, M.I. (2017), Umbrella Anchorage, Patent Application No. PCT/TR2017/050297.
  13. Evirgen, B., Tuncan, M. and Tuncan. A. (2019), "In-situ evaluation of adhesion resistance in anchor root zone", Proceedings of the International Congress and Exhibition "Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology", Cairo, Egypt, November.
  14. Green, J.H. (1981), Anti-Corrosive Structure Anchor Assembly, Granted Patent no: US4285993.
  15. Hanna, A., Rahman, F. and Ayadat, T. (2011), "Passive earth pressure on embedded vertical plate anchors in sand", Acta Geotech., 6(1), 21-29. https://doi.org/10.1007/s11440-010-0109-0.
  16. Hsu, S.C. and Chang, C.M. (2007), "Pullout performance of vertical anchors in gravel formation", Eng. Geol., 90(1-2), 17-29. https://doi.org/10.1016/j.enggeo.2006.11.004.
  17. Li, H., Liu, H. and Liu, S. (2017), "Dynamic analysis of umbrella suction anchor foundation embedded in seabed for offshore wind turbines", Geomech. Energy Environ., 10, 12-20. https://doi.org/10.1016/j.gete.2017.05.002.
  18. Liu, J., Liu, M. and Zhu, Z. (2012), "Sand deformation around an uplift plate anchor", J. Geotech. Geoenviron. Eng., 138, 728-737. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000633.
  19. Liu, X., Wang, J., Huang, J. and Jiang, H. (2017), "Full-scale pullout tests and analyses of ground anchors in rocks under ultimate load conditions", Eng. Geol., 228, 1-10. https://doi.org/10.1016/j.enggeo.2017.07.004.
  20. Liu, Y., Mei, G., Song, L. and Zai, J. (2008), "Experimental study of a new type umbrella-shaped anti-float anchor", Industr. Construct., 38(10), 71-75.
  21. Lu, H.H. (1987), Ground Anchor with Recoverable Steel Rods, Granted Patent No. US4697394A.
  22. Mackenzie, T.R. (1955), "Strength of deadman anchors in clay", M.Sc. Dissertation, Princeton University, New Jersey, U.S.A.
  23. Moghaddas Tafreshi, S.N., Javadi, S. and Dawson, A.R. (2014), "Influence of geocell reinforcement on uplift response of belled piles", Acta Geotech., 9(3), 513-528. https://doi.org/10.1007/s11440-013-0300-1.
  24. Mors, H. (1959), "The behaviour of mast foundations subjected to tensile forces", Bautechnik, 36(10), 367-378.
  25. Nanchang Inst. Technology (2014), Flexible Umbrella Supporting Anchor Bolt and Method for Supporting Soil Slope Thereby, Patent Application No. CN104179178A.
  26. O'Beirne, C., O'Loughlin, C.D. and Gaudin, C. (2017), "A release-to-rest model for dynamically installed anchors", J. Geotech. Geoenviron. Eng., 143(9), 04017052. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001719.
  27. Olthoff, J.R., Nichols, W.L., Harmon, R.A. and Duncan, C.L. (1993), Earth Anchor, Granted patent No. US5203127A.
  28. Prisco, C. and Pisano, F. (2014), "Numerical modeling and mechanical analysis of an innovative soil anchoring system", Acta Geotech., 9(6), 1013-1028. https://doi.org/10.1007/s11440-013-0250-7.
  29. Qiao, W., Wei, J., Lin, D., Wang, L. and Zhu, J. (2013), Improved Expanding End Anchor Device, Patent No. CN203239369U.
  30. Rao, A.S., Phanikumar, B.R., DayakarBabu, R. and Suresh, K. (2007), "Pullout behavior of granular pile-anchors in expansive clay beds in situ", J. Geotech. Geoenviron. Eng., 133(5), 531-538. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:5(531).
  31. Rowe, R.K. and Davis, E.H. (1982a), "The behaviour of anchor plates in clay", Geotechnique, 32(1), 9-23. https://doi.org/10.1680/geot.1982.32.1.9.
  32. Rowe, R.K. and Davis, E.H. (1982b), "The behaviour of anchor plates in sand", Geotechnique, 32(1), 25-41. https://doi.org/10.1680/geot.1982.32.1.25
  33. Shibata, M. (1976), Anchoring Device and Method for Settling the Device in the Ground, Granted Patent No. US3935912A.
  34. Song, Z., Hu, Y. and Randolph, M.F. (2008), "Numerical simulation of vertical pullout of plate anchors in clay", J. Geotech. Geoenviron. Eng., 134(6), 866-875. https://doi.org/10.1061/(ASCE)1090-0241(2008)134:6(866).
  35. Tang, C. and Phoon, K.K. (2016), "Model uncertainty of cylindrical shear method for calculating the uplift capacity of helical anchors in clay", Eng. Geol., 207, 14-23. https://doi.org/10.1016/j.enggeo.2016.04.009.
  36. Teng, W.C. (1962), Foundation Design, Prentice-Hall, New Jersey, U.S.A.
  37. Tian, Y., Gaudin, C. and Cassidy, M.J. (2014), "Improving plate anchor design with a keying flap", J. Geotech. Geoenviron. Eng., 140(5), 04014009. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001093.
  38. Univ. of Science & Tech. Beijing and Sinohydro Bureau 14 Co. Ltd. (2016), Extension Swing Type Anchor Rod Device, Patent Application No. CN105604057A.
  39. Wang, W., Wang, X. and Yu, G. (2016), "Penetration depth of torpedo anchor in cohesive soil by free fall", Ocean Eng., 116, 286-294. https://doi.org/10.1016/j.oceaneng.2016.03.003.
  40. Xu, M., Song, L.H., Zhou, F., Mei, G.X. and Zai, J.M. (2009), "Insitu test and numerical simulation of the umbrella-shaped uplift anchor", Rock Soil Mech., 30, 24-28. https://doi.org/10.3969/j.issn.1000-7598.2009.z1.006
  41. Yang, M., Murff, J.D. and Aubeny, C.P. (2010), "Undrained capacity of plate anchors under general loading", J. Geotech. Geoenviron. Eng., 136(10), 1383-1393. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000343.
  42. Yang, Q., Pan, G., Liu, H. and Wang, Q. (2018), "Bearing capacity of offshore umbrella suction anchor foundation in silty soil under varying loading modes", Mar. Georesour. Geotech., 36(7), 781-794. https://doi.org/10.1080/1064119X.2017.1388309.
  43. Yasuhiro, F. (2002), Method for Constructing Underground Laid Parachute Anchor Foundation for Soft Ground, Patent Application No. JP2002121735A.
  44. Zhang, J.H. (2006), "Study on effect of umbrella-shaped selfexpanding anchor after its application", Rock Soil Mech., 27(5), 842-845. https://doi.org/10.3969/j.issn.1000-7598.2006.05.033
  45. Zhu, H.H., Mei, G.X., Xu, M., Liu, Y. and Yin, J.H. (2014), "Experimental and numerical investigation of uplift behavior of umbrella-shaped ground anchor", Geomech. Eng., 7(2), 165-181. http://dx.doi.org/10.12989/gae.2014.7.2.165.