Arching in piled embankments: comparison of centrifuge tests and predictive methods - Part 2 of 2

The results presented from centrifuge tests for differential displacement at the embankment surface show clear maxima at the pile cap locations, the differential settlement increasing with g-level. Centrifuge test results modelling a working platform below pile cap elevation show a rapid increase in uniform settlement of the embankment surface at higher g-levels. The centrifuge test data are then plotted as a 'ground reaction curve' (GRC) to represent the presence of a thick working platform which causes significant settlement on an embankment. The curve shows a characteristically 'brittle' response where a point of maximum arching is reached at a relative settlement of about 5 per cent but then stress on the subsoil increases again with subsequent settlement. It is suggested that a GRC curve could be used in the design process as part of an interaction diagram. The effects of the additional load capacity of a geogrid could then also be factored in. Equations are presented to demonstrate this. Other factors which would need to be considered are noted such as 3-dimensional behaviour.

Language

  • English

Media Info

  • Pagination: 28-31
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01141184
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD
  • Created Date: Sep 30 2009 9:08AM