Abstract
A horizontal anchor is a structural member designed to resist the vertical pullout forces and ensure the stability of structures like the tower foundations, masts and bridges. This paper focuses on the experimental study for the estimation of the ultimate pullout capacity of multi-plate horizontal anchors embedded in the sand. The tensile load of a structure is resisted by the multi-plate anchors using the many plates connected along the central shaft. The multi-plate anchors would be capable of generating higher pullout capacity in comparison with the single-plate anchors, for an embedment depth considered. The pullout capacity is generative of the inherent structure of the multiple plates encompassing multiple layers of sand. The paper presents a comparison of the multi-plate anchors with the existing studies of single-plate anchors. Results show the multi-plate anchor replacing the existing single-plate anchors efficiently. Few of the primary conclusions are (a) the increase in the pullout capacity of the double-plate and triple-plate anchors with the increase in the embedment ratio, (b) the critical embedment ratio being indicative of a transition of the failure mechanism developing for shallow and deep anchors, (c) a decreasing pullout capacity for shallow multi-plate anchors in comparison with the single-plate anchors, and (d) an increasing pullout capacity for deep multi-plate anchors in comparison with the single-plate anchors. The paper provides a brief discussion on the scale effect, the effect of spacing, the effect of the shape of the anchors on the pullout capacity.
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References
Merifield RS, Sloan SW (2006) The ultimate pullout capacity of anchors in frictional soils. Can Geotech J 43:852–868
Meyerhof GG, Adams JI (1968) The ultimate uplift capacity of foundations. Can Geotech J 5(4):225–244
Das BM, Seeley GR (1975) Breakout resistance of shallow horizontal anchors. J Geotech Eng 101(9):999–1003
Ilamparuthi K, Dickin EA, Muthukrisnaiah K (2002) Experimental investigation of the uplift behaviour of circular plate anchors embedded in sand. Can Geotech J 39(3):648–664
Liu J, Liu M, Zhu Z (2012) Sand deformation around an uplift plate anchor. J Geotech Geoenviron Eng 138(6):728–737
Rokonuzzaman Md, Sakai T (2012) Model tests and 3D finite element simulations of uplift resistance of shallow rectangular anchor foundations. Int J Geomech 12(2):105–112
Dickin EA, Laman M (2007) Uplift resistance of the strip anchors in cohesionless soil. Adv Eng Software 38(8–9):618–625
Geddes JD, Murray EJ (1996) Plate anchors groups pulled vertically in sand. J Geotech Eng 122(7):509–516
Dickin EA (1988) Uplift behaviour of horizontal anchor plates in sand. J Geotech Eng 114(11):1300–1317
Sakai T, Tanaka T (1998) Scale effect of a shallow circular anchor in dense sand. Soils Found 38(2):93–99
Sakai T, Tanaka T (2007) Experimental and numerical study of uplift behaviour of shallow circular anchor in two-layered sand. J Geotech Geoenviron Eng 133(4):469–477
Kumar J, Bhoi MK (2009) Vertical uplift capacity of equally spaced multiple strip anchors in sand. Geotech Geol Eng 27:461–472
Tilak VB, Samadhiya NK (2017) Uplift capacities of double-plate square anchors at shallow depths in sand. In: Indian geotechnical conference GeoNEst, IIT Guwahati, Guwahati, Assam, India, pp 1–4
Tilak VB, Samadhiya NK (2019) Uplift capacities of triple-plate horizontal circular anchors in sand. In: Indian geotechnical conference, SVNIT Surat, Surat, Gujarat, India, pp 1–9
Das BM, Shukla SK (2013) Earth anchors, 2nd edn. J Ross Publishing Inc., USA
Basudhar PK, Singh DN (1994) A generalized procedure for predicting optimal lower bound break-out factors of strip anchors. Geotechnique 44(2):307–318
Subbarao KS, Kumar J (1994) Vertical uplift capacity of horizontal anchors. J Geotech Eng 120(7):1134–1147
Hanna A, Ayadat T, Sabry M (2007) Pullout resistance of single vertical shallow helical and plate anchors in sand. Geotech Geol Eng 25:559–573
Kumar J, Kouzer KM (2008) Vertical uplift capacity of horizontal anchors using upper bound limit analysis and finite elements. Can Geotech J 45(5):698–704
Kumar J, Kouzer KM (2008) Vertical uplift capacity of a group of shallow horizontal anchors in sand. Geotechnique 58(10):821–823
Merifield R, Smith C (2010) The ultimate uplift capacity of multi-plate anchors in undrained clay. In: GeoShanghai international conference: soil behaviour and geo-micromechanics (GSP 200), Shanghai, China, pp 74–79. https://doi.org/10.1061/41101(374)12.
Rajesh KN, Shreni V (2014) Response of anchor in two-phase material under uplift. APCBEE Procedia 9:247–251
Sahoo JP, Kumar J (2014) Vertical uplift capacity of two closely spaced horizontal strip anchors embedded in cohesive-frictional weightless medium. Can Geotech J 51:223–230
Bhattacharya P, Kumar J (2016) Uplift capacity of anchors in layered sand using finite-element limit analysis: formulation and results. Int J Geomech 16(3):04015078
Misir G (2018) Predicting the uplift capacity of vertically located two-plate anchors. Acta Geotechnica Slovencia 2:47–57
Mokhbi H, Mellas M, Mabrouki A, Pereira JM (2018) Three-dimensional numerical and analytical study of horizontal group of square anchor plates in sand. Acta Geotech 13:159–174
Liu H, Zubeck HK, Schubert DH (2007) Finite-element analysis of helical piers in frozen ground. J Cold Reg Eng 21(3):92–106
Ghaly A, Hanna A (1992) Stresses and strains around helical screw anchors in sand. Soils Found 32(4):27–42
Ghaly A, Hanna A, Hanna M (1991) Uplift behavior of screw anchors in sand. I: Dry sand. J Geotech Eng 117(5):773–793
Ghaly A, Hanna A, Ranjan G, Hanna M (1991) Helical anchors in dry and submerged sand subjected to surcharge. J Geotech Eng 117(10):1463–1470
Tsuha CHC, Aoki N, Rault G, Thorel L, Garnier J (2007) Physical modelling of helical pile anchors. Int J Phys Model Geotech 4:1–12
Tsuha CHC, Santos TC, Rault G, Thorel L, Garnier J (2013) Influence of multiple helix configuration on the uplift capacity of helical anchors. In: International conference on soil mechanics and geotechnical engineering, Paris, pp 2893–2896
Schiavon JA, Thorel L, Tsuha CHC (2016) Scale effect in centrifuge tests of helical anchors in sand. Int J Phys Model Geotech 16(4):185–196
Giampa JR, Bradshaw AS, Schneider JA (2017) Influence of dilation angle on drained shallow circular anchor uplift capacity. Int J Geomech 17(2):04016056-1-11
Motemedinia H, Hataf N, Habibagahi G (2019) A study on failure surface of helical anchors in sand by PIV/DIC technique. Int J Civil Eng 17:1813–1827
Clemence SP, Pepe FD (1984) Measurement of lateral stress around multihelix anchors in sand. Geotech Test J 7(3):145–152
Kumar J, Naskar T (2012) Vertical uplift capacity of a group of two coaxial anchors in a general c–φ soil. Can Geotech J 49:367–373
IS 2720-Part-III (1980) Method of test for soils, Determination of specific gravity, Section 2, Fine, medium and coarse-grained soils. Indian Standard methods of test for soils. New Delhi: Bureau of Indian Standards, pp 1–8
IS 2720-Part-IV (1995) Method of test for soils, Grain size analysis. Indian Standard methods of test for soils. Bureau of Indian Standards, New Delhi pp 1–38
IS 2720-Part-XIII (1992) Method of test for soils, Direct shear test. Indian Standard methods of test for soils. Bureau of Indian Standards, New Delhi, pp 1–13
IS 2720-Part-XIV (1995) Method of test for soils, Determination of density index (relative density) of cohesionless soils. Indian Standard methods of test for soils. New Delhi: Bureau of Indian Standards, pp 1–14
Tilak VB, Samadhiya NK (2018) Uplift capacities of inclined double-plate circular anchors at shallow depths in sand. In: Indian geotechnical conference, Indian Institute of Science, Bengaluru, India, pp 1–5
Sutherland HB, Finlay TW, Fadl MO (1982) Uplift capacity of embedded anchors in sand. In: Proceedings of 3rd international conference on offshore structures, vol 2, Cambridge, Massachusetts, pp 451–463
Tagaya K, Scott RF, Aboshi H (1988) Scale effect in anchor pullout test by centrifugal technique. Soils Found 28(3):1–12
Tsuha CHC, Aoki N, Rault G, Thorel L, Garnier J (2012) Evaluation of the efficiencies of helical anchor plates in sand by centrifuge model tests. Can Geotech J 49:1102–1114
Hao D, Wang D, O’Loughlin CD, Gaudin C (2019) Tensile monotonic capacity of helical anchors in sand: interaction between helices. Can Geotech J 56:1534–1543
Lutenegger AL (2011) Behavior of multi-helix screw anchors in sand. In: Pan-Am CGS geotechnical conference, Toronto, Ontario
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Tilak, B.V., Samadhiya, N.K. Pullout capacity of multi-plate horizontal anchors in sand: an experimental study. Acta Geotech. 16, 2851–2875 (2021). https://doi.org/10.1007/s11440-021-01173-1
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DOI: https://doi.org/10.1007/s11440-021-01173-1