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Recent content by DBNodurf

  1. DBNodurf

    DCP tests

    jdmm, the DCP doesn't correlate very well to soil strength compared to static cone penetration... D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
  2. DBNodurf

    Cellular cofferdam as bridge pier protection

    ishvaaag, google says this site is not to be found! D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
  3. DBNodurf

    Geotechnical Scope of Work

    The most consistent thing about soil is its inconsistency! D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
  4. DBNodurf

    Ducts, cables : influence of soil thermal characteristics

    These values aren't necessarily useful as defacto values; the properties of real soils are much too variable. D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
  5. DBNodurf

    soil stats

    regarding "relative humidity," the correct term is degree of saturation; the definition of relative humidity is the ratio of the vapor pressure of moisture in the air at a given temperature to the vapor pressure of saturated air at that temperature; i.e., the vapor pressure of the air...
  6. DBNodurf

    Nonwoven geotextile reinforcement

    True, Focht3; I actually meant geogrids were the best bet of the different geosynthetics, but the issue with the fill itself is the bigger picture; I went off on the geosynthetics sidetrack. D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience...
  7. DBNodurf

    Sample letter of agreement

    I suggest you shy away from American Institute of Architects model contracts because they are not friendly to subconsultants; the NSPE/ASCE/AGC mentioned in a previous post as being on ASCE's website are written in a much more equinamous manner. D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc...
  8. DBNodurf

    Nonwoven geotextile reinforcement

    The nonwovens are fine for temporary projects such as haul roads; their life is limited by high rates of creep (polypropylene creeps worse than polyethylene). Nonwovens have a much higher strain at a given stress than do wovens (i.e., lower modulus), so I wouldn't suggest using them when you...
  9. DBNodurf

    One point proctor method

    One-point "Proctors" are only useful to determine whether or not the correct curve is being used for testing, and/or to interpolate between curves where multiple soils are present on which moisture-density relationships have been determined, and where mixing will occur. In the latter...
  10. DBNodurf

    Correlation between horizontal and vertical permeability coefficients

    Plug & Chug... The main thing is not to overestimate Kh; its ok to underestimate it because its ok if the consolidation happens ahead of schedule with less surcharge because that saves money. Your Kv seems really high for a true clay (about 100x if its consolidated), so you could just use your...
  11. DBNodurf

    Correlation between horizontal and vertical permeability coefficients

    So the actual clay MINERAL content may not be all that great. The ironic thing about the Atterberg chart is that CL soils often are mostly silt and fine sand with a lot of kaolinite or a little bit of montmorillonite, or various other possible mixtures. Since the clay is of glacial origin, it...
  12. DBNodurf

    15m dia steel bin retaining wall (biggest gabion ever?)

    unless they look really, really good D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
  13. DBNodurf

    Starting a new firm?

    Watermelon, You don't HAVE to pay taxes on your income before you receive it. You are talking about the accrual method. The IRS allows you to use the cash method for paying taxes and you can use the accrual method for business planning. Yes, its okay to keep two sets of books as long as it...
  14. DBNodurf

    Why MD always overlying Alluvium

    fluctuations in sea level can also cause such a vertical profile D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
  15. DBNodurf

    Pin Foundations

    ooooohhhhh, delta force! awright! I saw a movie about delta force, but not about zero net delta force... but I thought they jumped without nets anyway... D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,... Principal Engineer/Geologist Atlantic Geoscience & Engineering Charlotte, NC
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