Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique

A. K. Leung, C. W. W. Ng

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Transient seepage analysis in unsaturated soils requires the soil-water characteristic curves (SWCCs) and permeability functions. Very often, the soil-water characteristic of a soil at high suction range (> 500 kPa) is obtained by extrapolating laboratory-determined SWCC at low suction range (0 to 500 kPa) using semi-empirical fitting methods. Relatively few measurements of SWCCs have been made on decomposed soils at high suctions. In this study, SWCC at low suctions of a completely decomposed tuff (CDT) in Hong Kong was measured using pressure plate apparatus, whereas the SWCC at high suctions was measured using the relative humidity (RH) control technique. Hence, the SWCC of CDT at "full suction range" is obtained by combining the measured data at low and high suctions. Comparisons and evaluations are then made with the extrapolated data using several existing semi-empirical fitting methods.

    Original languageEnglish
    Title of host publicationUnsaturated soils : experimental studies in unsaturated soils and expansive soils
    Subtitle of host publicationproceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009
    EditorsO. Buzzi, S. Fityus, D. Sheng
    Place of PublicationBoca Raton, Fla.
    PublisherCRC Press-Taylor & Francis Group
    Number of pages6
    ISBN (Print)9780415877176
    Publication statusPublished - 2009
    Event4th Asia Pacific Conference on Unsaturated Soils - Newcastle, Australia
    Duration: 23 Nov 200925 Nov 2009


    Conference4th Asia Pacific Conference on Unsaturated Soils

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