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Recent content by mdhshanwil

  1. mdhshanwil

    CPT Gauge Calibration

    BigH: If you're referring to calibration of the instruments, and not "zero readings" (or baseline readings) which should be performed before and after every sounding, actual calibration frequency should probably depend primarily on frequency of use, and care/maintenance by the operator. I...
  2. mdhshanwil

    H Pile Capacity Determined from Driving Data

    Very nice summary, BigH.
  3. mdhshanwil

    Determining type of soil

    Better yet, consult ASTM D 2488.
  4. mdhshanwil

    Cohesionless soil

    Your formula is only a subset of the general formulation. A more general formulation is: [(Rv * tan phi') + B*c + Pp] / [Rh] B = ftg width Pp = passive pressure from embedment Note that even this is simplified somewhat. Your formula has been simplified for a footing on a cohesionless soil...
  5. mdhshanwil

    External Stability of MSE Wall with Crash/Noise Barrier

    These loads are typically applied only for internal design of the MSEW. Your wall designer (assume you're only checking global - that's what it sounds like) will (OK, should) design the structure itself to meet internal stability design requirements. Have never seen these loads applied in...
  6. mdhshanwil

    Geotechnical Conferences in North America

    http://www.usucger.org/confer.html http://content.geoinstitute.org/events/events.html http://www.dfi.org/events.asp http://www.geosyntheticssociety.org/calendar.htm http://www.issmge.org/addon/
  7. mdhshanwil

    Pressure sensor in permeameter

    Your test sounds very similar to a granular filter analog of the Gradient Ratio Test (ASTM D 5101), a standardized test method to determine the compatibility of geotextile filters with base soils. The GR test is run in a rigid permeameter using manometers placed at various elevations in the...
  8. mdhshanwil

    Resonant column testing

    NVcaster-- I'm assuming that you're talking about laboratory methods? There are several field options as well. For low-strain lab determination of G, the res column is the most widely-used, and the only standardized test. Other options are ultrasonic pulse tests or piezoelectric bender...
  9. mdhshanwil

    Resonant column testing

    GeoTesting Express, Boxborough, MA. I've worked with them before--a quality lab. http://www.geocomp.com/
  10. mdhshanwil

    Methods of Shelby tube sample extrusion

    A nice overview of recommended practice is contained in Chuck Ladd and Don DeGroot's 2003 Arthur Casagrande Lecture: "Recommended Practice for Soft Ground Site Characterization", Proc 12th Panamerican Conf on Soil Mech and Geotech Engr, MIT, Cambridge, June 22-25. Recommendations are provided...
  11. mdhshanwil

    Pin Pile Capacity and Spacing

    There is quite a bit of information here: http://www.seattlegeotech.citymax.com/page/page/2911351.htm Including PDFs of a few related references for small diameter driven piles. -M. Harney
  12. mdhshanwil

    Using "Peck's Method" for design pressure

    I'm with you as far as disseminating the knowledge. As I alluded to above, this is the sort of thing that needs to be archived and distributed. The files are somewhat large, and would need to be hosted somewhere. 3 PDFs altogether, totaling 20 MB. I'm sure Terzaghi won't mind, but I'll...
  13. mdhshanwil

    Using "Peck's Method" for design pressure

    BigH-- <Thread_drift> I agree with you about the loss of our history as a profession. Especially sad considering how young we really are. As an example, I recently received a scanned copy of firsthand notes of Terzaghi's 1955 Applied Soil Mechanics course and his 1959 Engineering Geology...
  14. mdhshanwil

    Flow Fill

    http://www.flowablefill.org/
  15. mdhshanwil

    Help needed!!!! Triaxial test

    I played around with something similar to this doing some research a few years ago. We settled on manufacturing latex membranes with "nipples" into which probes were inserted. A small O-ring was used to hold the nipple on the probe (similar to the conventional method for holding membranes on...
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