Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: inaz
  • Order by date
  1. inaz

    PCCP for steep road

    Road with an 18% grade. The civil engineer and owner want to use Portland cement concrete. Low traffic, services about 10 or 12 homes. Good soil, 5in concrete on 4in base course. They have already poured curb and gutter. They don't know what to do, so they are asking me, the geotech...
  2. inaz

    Any way to reinforce an under-designed retaining wall?

    Good questions. From what I've heard it sounds like the footing and stem widths, and steel are too thin, but I'll get more info this afternoon in our site meeting.
  3. inaz

    Any way to reinforce an under-designed retaining wall?

    The structural engineer on our project just told me he way under-designed his retaining wall. He apparently plugged wrong data into his computer program. It's an 8-12 feet high wall with a backfill slope above the wall of at least 1.5H:1V, so loads are pretty high. I'm thinking maybe a few...
  4. inaz

    Lateral pressures due to steep slope surcharge

    PEinc ~ I like that thought, I'll explore that. Thanks
  5. inaz

    Lateral pressures due to steep slope surcharge

    We are constructing a steep reinforced slope (1:1) above a vertical concrete retaining wall. I'm having a difficult time determining the additional lateral pressure on the wall due to the steep slope. Rankine, Coulomb, or log-spiral do not work for slope angles greater than phi. I'd like to...
  6. inaz

    Lateral pressure for rock cut plus soil backfill?

    I'm looking for some guidance on how to determine appropriate lateral pressures for backfill between a rock cut and retaining wall. How should the depth of backfill soil affect lateral pressures in relation to wall height? Some kind of weighted average? Thanks for any assistance....
  7. inaz

    Anyone made their own oedometer

    Thanks Oldest, I like the ball bearing idea. After drawing the force diagram, I see that all I need to do is sum up the moments around the pin connector to determine the proper lengths for a 10:1 ratio. One more question, did your dial gauge rest on the top of the sample (the metal piece the...
  8. inaz

    Anyone made their own oedometer

    I hear it used to be fairly common for geotechs to have a machine shop make their consolidation/swell machines. I have a machine shop next door and thought I might try it. Has anybody done this and/or have pictures they can share?? The basic concept seems easy enough, but I'm not sure of...
  9. inaz

    Are PTI 2nd Ed. slabs now underdesigned

    As I read it, the 3rd Edition contains significant geotechnical revisions to establish Em and Ym values. Are "old" 2nd ed. PTI design values of Em & Ym, as determined prior to the 3rd edition PTI Manual procedures valid? My experience comparing the results of several current slab...
  10. inaz

    Any experience with the PQI 301 ?

    Just looking to see if anybody has any comments or experience with Qual Tech's PQI 301 for density testing of AC. Thanks
  11. inaz

    Any experience with PQI 301

    Just looking to see if anybody has experience with Qual Tech's PQI 301 machine for determining density of AC. Any comments are appreciated. Thanks.
  12. inaz

    PTI's 2004 Post Tension Design Values for soil seem high?

    I've been using the Post-Tensioning Institute's new 2004 3rd ed. Design Manual (AKA Alternative Procedures). I'm finding the soil design values I'm getting are significantly higher than the previous methods For example, a structural recently told me he calced a small, one-story...
  13. inaz

    Horizontal moisture Barrior for P-T foundation

    Project is residential tracked home development. To help reduce center/edge lift and edge moisture penetration, I wanted to recommend a horizontal barrier extending away from the slab. I envision a strong UV resistant geomembrane like one of the Permalon products placed 4 to 6 inches below the...
  14. inaz

    P-T slab for both settlement & expansion

    Nevermind, I've found that the Structual engineer can design a slab that will accomodate both settlement and expansive parameters.
  15. inaz

    P-T slab for both settlement & expansion

    I have a site with numerous home sites and soils that may experience settlement and others that may experice expansion. The Developer would prefer one set of soil parameters for post-tension design. My question is, would a design based on expansive soils work for soils subject to settlement, or...
  16. inaz

    Difference between restrained and unrestrained walls

    When should a wall be considered "restrained" or "unrestrained" in relation to later soil pressures. Specifically my question is in relation to 6 feet high walls of a swimming pool. The structral engineer thinks there is enough distance between the perpindicular walls on the sides to make it...
  17. inaz

    SPT values in Sands

    Solid stem augers would mean that you had to pull the augers out before dropping in your rods and split spoon sampler. Is this what you did? Are you drilling with hollow stem? Using a plug or pilot bit?
  18. inaz

    Addition - Full Basement Foundation next to Slab Foundation

    It wouldn't be a free standing slurry wall. It would be outside of his cut slope. Since there's no soils engineer involve, I figured he'll probably end up digging a steeper cut slope then OSHA requires, and the wall would help to prevent undermining the building if a portion of the cut slope...
  19. inaz

    Addition - Full Basement Foundation next to Slab Foundation

    How 'bout this. Dig a 6 feet deep, 12" wide trench between the two buildings, near the top of your proposed excavation. Backfill the trench with lean slurry (2-sack). After a few days, perform your basement excavation. The slurry wall should be sufficient for temporary support of soils below...
  20. inaz

    to deal with a swamp area

    Geocontractor: I don't understand what a vertical concrete element with a geogrid mattress are. For my own education, would you please elaborate. Thanks.

Part and Inventory Search

Back
Top