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Recent content by Bluefoot

  1. Bluefoot

    Geogrids vs. Geotextiles - Setting the Facts Straight

    theanimal1999, "If you need some references I would be glad to provide them." Can you please send me some of the Army Corps reference regarding the design guide? Thanks.
  2. Bluefoot

    Shear Strength Correlation

    Additionally, studies have been carried out by Charles and Watts (1980), Billam (1971), Bolton (1986), Barton and Kjaernsli(1981) and Maksimovic (1989) on rockfill materials. These are discussed in Advances in Rockfill Structures by Maranha das Neves.
  3. Bluefoot

    Shear Strength Correlation

    Strength correlation reference: Granular material: RC% vs phi' see Wong and Duncan (1974), Hyperbolic Stress-strain Parameters for Nonlinear Finite Element Analysis of Stresses ans Movements in soil Masses. Compacted Cohesive Soils: RC% vs c',phi' see US Department of Interior (1973), Design...
  4. Bluefoot

    Type of Foundation and Method of Installation into Boulder &Gravel

    The linked paper here may be of some use though it is not for the situation there. A somewhat properly designed and constructed foundation has to be in place to avoid the failures.http://files.engineering.com/getfile.aspx?folder=5f29ba2b-339c-4802-9a4b-af4d2529b4fd&file=Gravelly_cobble.pdf
  5. Bluefoot

    Laterally loaded pile + excavation

    GeoPaveTraffic is right. The following questions need to be answered before the geotechnical engineer can give an answer: 1. what kind cohesive soil it is, fill, soft clay, firm clay, stiff clay or hard clay? 2. where is the ground water regime? 3. how deep is the excavation? 4. how long will...
  6. Bluefoot

    Differential Settlement over a Long Span

    If the loading condition is not defined (in most cases at the time of investigations, as mentioned by BigH), geotechnical engineers usually calculate (back) the limiting load for serviceability, based on the site differential subsurface conditions, assumed footing types and configurations. The...
  7. Bluefoot

    estimation of winkler foundation modulus

    Modulus of subgrade reaction was rooted from a structural approach, as indicated in the Soil Mechanics in Geotechnical Engineering by Terzaghi et al. The referenced paper shows a review on this approach. http://www.iasmirt.org/iasmirt-2/SMiRT18/K06_3.pdf The equation you referred is likely...
  8. Bluefoot

    Foundation on Big Rocky Soil

    Geotechnical engineer is the one you should ask about at this case. The house may be little loading to worry, the different bearing characteristics is. It is hard to say that the limestone is 'good' for supporting, it depends on where you are and what kind of limestone you encounter. Ground...
  9. Bluefoot

    Tower Foundation Design

    Tower foundation may be designed by conventional methods. Considerations should be given to cyclic loading conditions. Bryne and Houlsby (2003) in their paper "Foundations for offshore wind turbins" give a simpflied design method to monopole foundations. This may be helpful to model your...
  10. Bluefoot

    New Bank Slab on Grade Built on Top of Old Foundations

    Are the new and old building footprints the same and structurally comparable? Many factors may affect the decision to where to remove and where not to, but by the end of the day, a detailed review and inspection (geotechnically and structurally) may cost the banker a lot more.
  11. Bluefoot

    Subgrade Stabilization

    If this just for constructibility, and if the fill is relatively stable and workable, e.g. compact or dense condition, groundwater controllable,etc., and your construction equipment is able to reach the bottom of fill, you may have options as: 1. Engineered fill: dig it out and relay it with...
  12. Bluefoot

    Pocket Penetrometer in Split Spoon Sample

    It may be more of an engineering practice problem. An engineer should always ask himself the question "How much do I believe in the number I got" before blindly rely on the correlation. Most conventional geotechnical tools are not invented as an absolute measure, but a comparative measure...
  13. Bluefoot

    New Foundation over Old Foundation

    1. Obtain the orginal as-built drawings and compare the old footprint/load conditions with the new ones; 2. Consider leaving slabs/footing units in place, provided slabs cut to smaller sizes (2x2m); Subexcavate at areas where you have concerns of uniformity of the substructure/subsoil condition...
  14. Bluefoot

    Retaining wall crack, solution to fix please!

    Studies suggested the main causes of retaining wall failures. Figure: Summary of Experience with Unsatisfactory Retaining Walls from USACE EM 1110-2-2502 pg 6-16 http://www.usace.army.mil/publications/eng-manuals/em1110-2-2502/c-6.pdf
  15. Bluefoot

    Geogrid Vs. Geotextile

    Have a look at GMA Handbook for Geosynthetics. It may be helpful.http://www.gmanow.com/pdf/GMAHandbook_v002.pdf
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