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Recent content by Efty

  1. Efty

    spt correlations to su

    Some more information regarding Stroud relation for the aid of conversation: 1. The tests referred to stiff to hard fissured clays and weak rocks. 2. The blow counts were correlated with undrained strenghts from UU triaxial compression tests in 102 mm diameter specimens. 3. The standard...
  2. Efty

    spt correlations to su

    1. In addition to Delijosi post about the relation of Stroud (1975) some more information on values of f1 (all in kPa): f1?4.5 for PI>30% f1?5 for PI=25% f1?7 for PI=15% 2. According to Sowers in kPa (I found the relation from graph of NAVFAC DM7.01 with the adequate conversion)...
  3. Efty

    how can I relate SPT - N values to Youngs Modulus in sands

    Burland & Burbridge method refers mainly to shallow foundations, so I don't know whether it works well with pile problems. A guide to get a rough estimation of E in sands is by multiplying N by 0.5 for silty sands and by 1.0 for gravelly sands (E in MPa). It is obvious that the silt content...
  4. Efty

    how can I relate SPT - N values to Youngs Modulus in sands

    By Schultze and Menzenbach (1961) E=2400+530*N±2100 (kPa) for silty Sands E=3800+1050*N±9300 (kPa) for gravelly Sands
  5. Efty

    Which method is preferable when estimating safety factors? LEM or FEM?

    Thanks for the useful replies. GeoPaveTraffic, I also basically use LEM for estimating SF and PLAXIS or simple spreadsheets for the estimation of settlements and deflections. Nevertheless, you can easily get a SF by running a simple "phi-c reduction" analysis when using PLAXIS. In this method...
  6. Efty

    Which method is preferable when estimating safety factors? LEM or FEM?

    Hi, I am investigating 3 different geometries of embankments. I' m both using PLAXIS and a conventional software based on method of slices (ex. SLOPE/W incorporating Morgenster-Price approach). In all cases, PLAXIS gives always a lower S.F. In one case the difference is rather large. For...

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