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

    Abstract

    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
    Pages199-204
    Number of pages6
    ISBN (Print)9780415877176
    Publication statusPublished - 2009
    Event4th Asia Pacific Conference on Unsaturated Soils - Newcastle, Australia
    Duration: 23 Nov 200925 Nov 2009

    Conference

    Conference4th Asia Pacific Conference on Unsaturated Soils
    CountryAustralia
    CityNewcastle
    Period23/11/0925/11/09

    Cite this

    Leung, A. K., & Ng, C. W. W. (2009). Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique. In O. Buzzi, S. Fityus, & D. Sheng (Eds.), Unsaturated soils : experimental studies in unsaturated soils and expansive soils: proceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009 (pp. 199-204). Boca Raton, Fla.: CRC Press-Taylor & Francis Group.
    Leung, A. K. ; Ng, C. W. W. / Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique. Unsaturated soils : experimental studies in unsaturated soils and expansive soils: proceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009. editor / O. Buzzi ; S. Fityus ; D. Sheng. Boca Raton, Fla. : CRC Press-Taylor & Francis Group, 2009. pp. 199-204
    @inproceedings{72ea224563bc4033aa1feac262e5dfc5,
    title = "Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique",
    abstract = "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.",
    author = "Leung, {A. K.} and Ng, {C. W. W.}",
    year = "2009",
    language = "English",
    isbn = "9780415877176",
    pages = "199--204",
    editor = "O. Buzzi and S. Fityus and D. Sheng",
    booktitle = "Unsaturated soils : experimental studies in unsaturated soils and expansive soils",
    publisher = "CRC Press-Taylor & Francis Group",

    }

    Leung, AK & Ng, CWW 2009, Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique. in O Buzzi, S Fityus & D Sheng (eds), Unsaturated soils : experimental studies in unsaturated soils and expansive soils: proceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009. CRC Press-Taylor & Francis Group, Boca Raton, Fla., pp. 199-204, 4th Asia Pacific Conference on Unsaturated Soils, Newcastle, Australia, 23/11/09.

    Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique. / Leung, A. K.; Ng, C. W. W.

    Unsaturated soils : experimental studies in unsaturated soils and expansive soils: proceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009. ed. / O. Buzzi; S. Fityus; D. Sheng. Boca Raton, Fla. : CRC Press-Taylor & Francis Group, 2009. p. 199-204.

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

    TY - GEN

    T1 - Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique

    AU - Leung, A. K.

    AU - Ng, C. W. W.

    PY - 2009

    Y1 - 2009

    N2 - 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.

    AB - 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.

    M3 - Conference contribution

    SN - 9780415877176

    SP - 199

    EP - 204

    BT - Unsaturated soils : experimental studies in unsaturated soils and expansive soils

    A2 - Buzzi, O.

    A2 - Fityus, S.

    A2 - Sheng, D.

    PB - CRC Press-Taylor & Francis Group

    CY - Boca Raton, Fla.

    ER -

    Leung AK, Ng CWW. Experimental study of the soil-water characteristics of a decomposed soil using the relative humidity (RH) control technique. In Buzzi O, Fityus S, Sheng D, editors, Unsaturated soils : experimental studies in unsaturated soils and expansive soils: proceedings of the 4th Asia Pacific conference in saturated soils, Newcastle, Australia, 23-25 November 2009. Boca Raton, Fla.: CRC Press-Taylor & Francis Group. 2009. p. 199-204