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Capacity of grillage foundations under horizontal loading
Knappett, J.; Brown, M.; Bransby, M.; Hudacsek, P.; Morgan, N.; Cathie, D.; Maconochie, A.; Yun, G.; Ripley, A.; Brown, N.; Egborge, R. (2012). Capacity of grillage foundations under horizontal loading. Geotechnique 62(9): 811-823. https://dx.doi.org/10.1680/geot.12.OG.012
In: Geotechnique: the international journal of soil mechanics. Institution of Civil Engineers: London. ISSN 0016-8505; e-ISSN 1751-7656, more
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    footings/foundations; model tests; offshore engineering; plasticity;sands
Authors  Top 
  • Knappett, J.
  • Brown, M.
  • Bransby, M.
  • Hudacsek, P.
  • Morgan, N.
  • Cathie, D., more
  • Maconochie, A.
  • Yun, G.
  • Ripley, A.
  • Brown, N.
  • Egborge, R.
Abstract
    Grillage foundations are an alternative to solid surface mudmats for supporting seabed infrastructure, offering improved hydrodynamic performance and savings in foundation material. Recent research has demonstrated that grillages can be designed to have similar vertical bearing capacity to a mudmat with the same footprint. This is extended herein by: (a) determining grillage performance under horizontal loading at constant vertical load (V-H); (b) the application and development of existing plasticity-based models for predicting performance; (c) comparing the V-H behaviour with surface mudmats; and (d) discussing the implications for design. Experimental tests were conducted in sands over a range of densities and in two different modes, representing different installation procedures. In over-penetrated tests, the foundations were installed to achieve a vertical bearing capacity V0, followed by horizontal loading at a constant vertical load with V < V0. In normally penetrated tests, foundations were installed to V0 before horizontal loading at constant vertical load with V = V0. Both normalised V-H yield surfaces and a plasticity-based simulation model are presented for use in design. Laboratory-scale grillages offer improved horizontal capacity in loose and medium-dense sands and similar horizontal capacity in very dense sand, compared with surface mudmats.
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