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Recent content by wmta

  1. wmta

    Shoring for excavation to rock

    a tremie slab of less than about 1 meter would be the min thickness of the slab is placed underwater by a very experience crew but a thickness of 1.5 meter may be much better. Once the cofferdam is dewatered make sure you check uplift. In addition, you need to make sure the cofferdam is...
  2. wmta

    AASHTO LRFD Design for Sheet Pile Cofferdams with Water Pressure (WA)

    using a water loading with a FS of yield stress in the sheet pile makes now sense even if the code recommends this. This code is not conservative for this condition asce standard 7-05 requires factor load of 1.4(D+Fluid) also another load condition is 0.9d + 1.0 E + 1.6 H(lateral or water...
  3. wmta

    temp. retaining wall using a beam in concrete and 1" 'street plate'

    The system you have will not work, too much deflection. Get some help
  4. wmta

    Pile movement immediately after detensioning tieback

    the deflection will depend on the new existing structure and the procedure for removalhttp://www.wmta.com/
  5. wmta

    Braced cofferdam - Embeddment depth of Piling Question

    I have read this site and the issues are critical and need a high level of experience YOU need a seasoned professional williamhttp://www.wmta.com/
  6. wmta

    Why is the building code so bad ?

    It is time to start pushing back from the bad decisions. I have no problem with ACI, AISC. I have a problem with a building code that is badly developed and so complex that normal engineers can not easily understand and apply the code.
  7. wmta

    Extremely Low Engineering Fees

    Not to worry the ASCE is helping out. Keeping the cost low by charging so much for the work done for free by members.
  8. wmta

    CFA Pile wall design

    you need to review these references http://www.fhwa.dot.gov/engineering/geotech/library_arc.cfm?pub_number=55
  9. wmta

    Lagging - long vs short term

    Does not sound like anyone has any idea about this. There has not been must testing doing to find real loading conditions. The arching for sand would not be time dependent. The arching of soil is a complex system that is not easily modeled by FEA or other means.
  10. wmta

    Diaphragm wall extension

    jack, I would consider rebracing the wall at the bottom while the new slurry wall is placed. This could be providing additional tieback close to the toe as one option. You need to be concerned about both lateral movement of the toe and vertical support of the wall. This work is tricky and...
  11. wmta

    Soil Arching Effect

    Secant piles are not designed to have spacing between the piles, the arching between the pile is total dependent on the cohesion of the soil which my vary. The only reason i can imagine using secant pile is to limit deflection and potential ground lose where settlement is an issue. I have use...
  12. wmta

    Trench In front of Cantilevered Wall

    This whole discussion amazes me. Does anyone ever use drawings to show what they are talking about. The type of design are critical to new structures and how you build the project. The simple solution is to install rakers and a waler to brace the wall. A 17'6 cantilever is a major structure...
  13. wmta

    Stability check for Temp. Sheet Piling Retaining Wall

    This is too complex to try to solve over the net and with this forum. Without some detailed study I would be very careful. A 16'-0 cantilever needs some experience and judgement. Just be carefulhttp://www.wmta.com/
  14. wmta

    Why is the building code so bad ?

    You made a good point. One of the questions is how to make the code simple for designs that require a simple approach with the ability to make a more detailed analysis if time and money warrant the effort. The present code does not consider this and it is a big missing.
  15. wmta

    Retaining Wall with Log Loader

    I am not clear about a few things which could effect the surcharge loading to your wall. A surcharge of 250 psf/ft is a normal surcharge for heavy construction loading. But the actual loading of the loader may control. Normally i would expect so shoulder on the travel way and a width for...
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