SETTLEMENT AND PORE-WATER PRESSURE DISSIPATION WITHIN AN EMBANKMENT BUILT OF LONDON CLAY

In the construction of earthworks for roads, economies will usually be achieved by making the maximum use of cohesive soils already on site and avoiding the expensive importation of fill. However, the engineer must ensure that embankments constructed using such soils are stable and do not settle excessively. This paper describes the observations made during and after construction of an embankment built of London clay. Laboratory tests were carried out to enable predictions to be made of the rate of settlement and dissipation of pore-water pressure within the embankment. The predicted rates were then compared with those measured during the first four years after completion of the embankment. It was found that care was needed in the interpretation of laboratory consolidation tests, both because the consolidation of the specimens departed somewhat from theory and because of the variability of the results. The dissipation of pore-water pressure predicted from these results using a finite difference technique was found to be in reasonable agreement with that measured by piezometers installed in the embankment. The settlement within the embankment was found to be small in relation to that of the foundation soil and in reasonable agreement with that estimated during compressibility data derived from laboratory consolidation tests carried out on samples of the fill at the equivalent field moisture contents. (a) (TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 101-106

Subject/Index Terms

Filing Info

  • Accession Number: 00311807
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-0069-3
  • Report/Paper Numbers: Proceeding
  • Files: ITRD, TRIS
  • Created Date: Jul 22 1980 12:00AM