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Recent content by RobPE

  1. RobPE

    Pneumatic vs Hydraulic Controlled Direct Shear Machines

    Thanks for the reply. We do plan to do this. I'm anticipating that our machines will be within the tolerance, but nevertheless, my concern is not meeting the ASTM spec. We've had requests for specifically hydraulic-controlled loading. Wondering if you've encountered this.
  2. RobPE

    Pneumatic vs Hydraulic Controlled Direct Shear Machines

    Is there an advantage to hydraulic vs pneumatic controlled direct shear test machines? Section 6.4 of ASTM D5607 states that for maintaining the Normal Pressure: “hydraulic component that will hold a pressure, within 1%”. For shear displacement, Sect 8.6.2.2, no explicit hydraulic...
  3. RobPE

    piano wire for "vibrating wire" application

    Most of us geotechs know the hardware, know what it does, and understand how it works, but don't understand the mechanical engineering that goes into the hardware. You might have better luck posting this kind of question to mechanical or materials science engineers.
  4. RobPE

    Location of critical slip surface though stone cliff face?

    Can you post a cross section that shows the geology, the quarry, and the planned excavation?
  5. RobPE

    Please try to help me with this. (mining)

    What are you trying to measure?
  6. RobPE

    Steep Rock Slopes

    Clarification of my statement regarding the Hoek-Brown criterion - this is a method of rock mass shear strength estimation with rock mass being defined as whole rock inclusive of joints and intact rock. The "rock mass" concept is used to downgrade the shear strength from intact rock free of...
  7. RobPE

    Steep Rock Slopes

    The majority of my practice is in rock slopes and I feel that the tone of this thread is far off track. The issue at hand should be "What kind of failure modes should I expect?" rather than "What kind of software should I be using?". To ask the latter first is putting the cart before the...
  8. RobPE

    Soil Bearing Pressure

    killswitchengage- regardless of your opinion, the tone of your response is totally out of line. Professionals come to this site for help, not to be belittled.
  9. RobPE

    Rock Anchor Loads

    Here is the book you need to read: https://www.rocscience.com/hoek/corner/Support_of_Underground_Excavations_in_Hard_Rock.pdf and it's free. You are correct in that the span and the size of the beam or wedge dictate the ground support needs. The geotechnical design starts with of course, a...
  10. RobPE

    Using RMR System to Determine Mass Strength of Jet Grout or Concrete

    It would be incorrect to use RMR or Q on concrete blend products. The "mass" strength has no applicability here. Rock mass strength is an intermediate strength between that of discontinuities and intact rock. Using the Hoek-Brown method, this strength is estimated using GSI (or RMR) as one of...
  11. RobPE

    Inclinometer casing installation

    Casing deflection is measured relative to the baseline or post installation reading, so even if you're not quite vertical, you'll still pick up the movement.
  12. RobPE

    groundwater level in a nested piezo

    I've seen the phenomenon you're describing many times, but in very deep installations (>1000'). A significant difference in readings would indicate either a perched aquifer or a hydraulic gradient. I would say that your data indicates more or less hydrostatic conditions for the purpose of your...
  13. RobPE

    Excel Column Chart

    That is simple. Nice and easy. Thanks
  14. RobPE

    Fortran 77 Debugging Program

    I'm looking for a good debugging program for Fortran 77. Any suggestions would be appreciated. I've been working with the VBA for Excel debugger a bunch lately, which is very slick, and would like something similar for Fortran. Thanks
  15. RobPE

    Excel Column Chart

    I'd like to make a simple column chart in Excel with multiple data series. However, I don't want the series to plot next to each other which is the Excel default; I'd like to plot the series grouped together. The easiest way to explain is with a simple example of temperature data. Say you want...
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