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  • 1.  Advice on a Retaining Wall

    Posted 08-09-2024 01:07 PM
    Edited by Tirza Austin 08-19-2024 10:05 AM
      |   view attached

    A Retaining walls section is attached please anybody advise me about the practice of RCC.

    Alex Thomas FIE MASCE 

    It's used for keeping common Salt ie sodium chloride

    for a chemical industry. Salt mining from land. Collection and storing is done by mechanical loaders moving vehicular loading has to be considered. .Roof truss must be connecting to the wall. Separate column bars shall be given. Opinion is sought. 

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    Alex Thomas R.Eng, C.Eng, M.ASCE
    Senior Site Engineer
    Geo Structurals Pvt Ltd
    CochinAlexThomasR.Eng, C.Eng, M.ASCEIndia
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    RW.pdf   24 KB 1 version


  • 2.  RE: Advice on a Retaining Wall

    Posted 08-12-2024 01:51 AM

    I would check the geometry of the wall for geotechnical stability.  I am used to seeing the base width being 1/2  to 2/3 of the height as a minimum. 



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    David Thompson P.E., M.ASCE
    Principal
    KTA Structural Engineers Ltd.
    Calgary AB
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  • 3.  RE: Advice on a Retaining Wall

    Posted 08-14-2024 12:21 PM

    If this is a cantalivered retaining wall you need to have a leg of concrete extend into the surcharg load. The leg needs to be long enough so the weight of the soil on the leg is enough to prevent rotation of the wall from the lateral earth pressure. You'll then have to recalulate the new lateral force resistance of the wall with the new friction force between the wall and the underlying soil and the earth pressures against the keyway. 



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    Dustin Leduc A.M.ASCE
    Field Engineer
    Sambatek
    Shakopee MN
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  • 4.  RE: Advice on a Retaining Wall

    Posted 08-14-2024 12:21 PM

    Besides local stability I would check global stability, including uplift forces in your heel area.  Is the stem section going to be subject to any vehicle loading? If so it may affect the forces/loading you use. The stem and footing seem slender to me, I would check any serviceability issues.



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    Bernard Walko P.E., M.ASCE
    Planning Unit Engineering Manager
    Olyphant PA
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  • 5.  RE: Advice on a Retaining Wall

    Posted 08-23-2024 09:31 AM

    Speaking for myself there is too many variables to offer advice: from soil characteristics, to vehicular loadings, to wind loading. The only advise I can offer is to develop a methodology to combine all the topics we see here, and any that might be missing, to obtain the combinations of forces you must design for. Then evaluate these forces against the soil conditions and design structure sections and connections that will withstand your established parameters within what factor of safety you are using. Good luck.    



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    Bernard Walko P.E., M.ASCE
    Planning Unit Engineering Manager
    Olyphant PA
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  • 6.  RE: Advice on a Retaining Wall

    Posted 08-26-2024 11:05 AM
      |   view attached

    I have attached one of the best references I have found to date for retaining wall design. It is a chapter from Peck, Hanson, and Thornburn's Foundation Engineering. This will give you a good place to start and there is an excellent example near the end of the chapter that will walk you through a design step by step. It is in English units hopefully that isn't too much of a problem. You will also need to consult with a geotechnical engineer or at the very least a stamped geotechnical engineering report to obtain the engineering soil properties, e.g. friction angle, bearing pressure, etc. for use in your design. It also sounds like from your problem statement that the material behind the retain wall is different from the material on which your foundation will bear which you will need to account for as well. If there will be vehicular loading, e.g. excavators, behind the wall you need account for the additional loading. In addition to the structural design (shear and moment capacity, connection design) and local stability (sliding, bearing, overturning) of the wall you need to check for global slope stability which is not addressed in the example I have provided. There may be other additional considerations above and beyond those listed here or given in the example you need to consider.

    Note the above is only offered as general topic knowledge as in an academic or training setting. It is not and should not be taken as my engineering opinion. You must assess your problem for all plausible failure modes, gather the necessary data, perform calculations, and use your own engineering judgement to complete the design in a safe manner. Finally and respectfully, it is part of our code of ethics as engineers to not practice outside our area of expertise. If you do not feel that you have the level of knowledge required to safely design a structure I recommend that you consult with someone who is more experienced in this area in a professional capacity. 



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    Michael Whitten P.E., M.ASCE
    Bridge Engineer
    Baltimore MD
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