Discussion: View Thread

  • 1.  Consolidation settlement

    Posted 10-10-2018 12:26 PM
    Edited by Tirza Austin 10-10-2018 04:00 PM
    Good day,
    I am having a bit of a challenge in understanding a few concepts on consolidation settlement. Can you please assist with either the process or workings for the following question.

    A layer of this clay 8m thick was preloaded by a 4m thick layer of sand, the unit weight for both soils is 19kN/m3. This was done to facilitate consolidation for the construction of a 5m high embankment whose unit weight is 22kN/m3. The clay layer is underlain by a pervious rock and the value of cv is 4.5m2/yr. The in-situ preconsolidation pressure was 35kPa. a) How much settlement was induced by the surcharge?
    Given that Cc=0.548 and Cs = 0.122 and e0= 1.89

    Thank you

    Kelvin Marumba S.M.ASCE

  • 2.  RE: Consolidation settlement

    Posted 10-11-2018 08:04 AM
    Edited by Tirza Austin 10-11-2018 08:03 AM
    Assume drainage only thru the top layer. Therefore, total thickness of the soil is the drainage height.
    Ignore settlement of rock.
    Ignore CV as you are interested only in total settlement.
    Assume rectangular stress surface equal to embankment pressure.
    See complete 8 chapter discussion of settlement and consolidation by Roy E. Olson on Academia:
    Chapter 1. Professor Roy E. Olson on Consolidation

    Academia remove preview
    Chapter 1. Professor Roy E. Olson on Consolidation
    Academia.edu is a platform for academics to share research papers.
    View this on Academia >

    Edmund McNulty P.E., P.G., M.ASCE
    Senior Engineering Manager
    Millersville MD
    (410) 729-4091