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  • Users: cbosy
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  1. cbosy

    Constrained Modulus Vs Young's Modulus

    When would one be used rather than the other? Say the depth to rock is 100 ft (H) and the footing is 25 ft wide (B), I would use the Young's Modulus. If B=100 ft and H=25 ft, I would use the constrained modulus. Does anyone have any references or guidance when to choose between the two when...
  2. cbosy

    Horizontal Acceleration for Liquefaction Analysis

    What horizontal acceleration should be use to assess liquefacton under an ethanol plant?
  3. cbosy

    Spring Constant

    Does anybody know how to estimate a vertical spring constant in kips per inch for the tip of a micropile embedded a couple of ft into very hard dolomite?
  4. cbosy

    Porous Pavement

    Does anybody know where I can obtain design info and spec's for the above?
  5. cbosy

    Weight of Light Tower

    Can somebody tell me what the upper limit weight of a 120 ft tall, 4 legged, metal lattice type light tower is? We have to pick it up and set it down because we are digging next to it (I am a geotechnical engineer). TX Chris Bosy
  6. cbosy

    Weight of Light Tower

    I am a geotechnical engineer so this area is way new to me. Can you tell me roughly what the weight of a 120 ft tall 4 legged light tower might be? We have to hoist it with a crane and set it down because we are digging next to it. Are they strong enough to grab say 2/3 of the way up and then...
  7. cbosy

    H-Piles bearing on shale

    When bearing on shale, should the bearing area be the projected overall area of the H-pile or the area of the steel or shoe? I know it depends on whether a plug forms but unfortunately it is not possible to directly view this. The shale is not considered friable with N-values typically in the...
  8. cbosy

    Energy Correction For Automatic Hammer

    This is more a poll then anything else. The automatic hammer delivers about 90% of the theoretical enegy while the old cathead driven hammer delivers about 60%. Several papers now say to correct the N Values by multipying them by anywhere from 1.25 to 1.5. I personally use 1.4. What are are...
  9. cbosy

    Pile capacity prediction using Vibratory hammer

    Has anybody heard of any method to predict pile capacity using a vibratory hammer?
  10. cbosy

    Piles going deeper than expected

    Does anybody know of any good case studies where piles went significantly deeper than the borings predicted?

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