Volume 37, Issue 3 (May 2014)

    Consolidation Analysis by the Modified Slope Method

    (Received 20 May 2013; accepted 6 January 2014)

    Published Online: 2014


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    The slope method (Al-Zoubi, 2008, Geotech. Test. J., Vol. 31, No. 6, pp. 526–530) in which the coefficient of consolidation cv was expressed as function of the EOP settlement δp and slope m of the initial linear portion of the observed δt − √t curve is modified for improving the procedure used for estimating the EOP δp. The slope method EOP δp values were estimated using the point at which δt − √t curve starts to deviate from the initial linear portion. In this note, the EOP δp is determined based on a unique relationship between the ratio of the secant slope of δt − √t curve at 50 % consolidation to the secant slope at any time arbitrarily selected beyond the initial linear portion of the δt − √t curve (theoretically, at U ≥ 52.6%) and average degree of consolidation U. The modified slope method requires a minimum of four compression-time data points for better cv estimates. Two types of EOP settlement are identified; local EOP settlement δpi is obtained at a specific Ui value as is the case in the Taylor method and global EOP settlement δp is determined independently of any U value. The modified slope method yields δp and cv values quite similar to those of the Casagrande method.

    Author Information:

    Al-Zoubi, Mohammed Shukri
    Civil and Environmental Engineering Dept., Faculty of Engineering, Mutah Univ.,

    Stock #: GTJ20130097

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20130097

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    Title Consolidation Analysis by the Modified Slope Method
    Symposium , 0000-00-00
    Committee D18