Evaluation of True Cν and Instantaneous Cν, and Isolation of Secondary Consolidation

    Volume 21, Issue 2 (June 1998)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Page Count: 7


    Tewatia, SK
    Assistant research officer, Central Soil and Materials Research Station, Ministry of Water Resources, Olof Palme Marg, Hauz Khas, New Delhi,

    Abstract

    It is shown that the presence of a distinct straight line in the initial portion of settlement versus the square root of time plot indicates that soil follows theoretical behavior and that there is no initial and secondary compression in the straight line portion. If the coefficient of consolidation, cν, is determined using the data of only this portion, it can be regarded as the true cν. Secondary consolidation essentially starts after 60% consolidation and runs superposed over the primary consolidation. Its effect is to gradually decrease cν so that at every instant of time it is a new Terzaghian soil with a new cν and other consolidation parameters. Characteristics of linear and semi-log plots of U versus U, where U is the degree of consolidation and U is the theoretical velocity, are used for determining true cν and instantaneous cν, and for isolation of secondary consolidation from the experimental consolidation curve.


    Paper ID: GTJ10748J

    DOI: 10.1520/GTJ10748J

    ASTM International is a member of CrossRef.

    Author
    Title Evaluation of True Cν and Instantaneous Cν, and Isolation of Secondary Consolidation
    Symposium , 0000-00-00
    Committee D18