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    Suction Stress Characteristic Curve for Unsaturated Soil

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2006:;Volume ( 132 ):;issue: 002
    Author:
    Ning Lu
    ,
    William J. Likos
    DOI: 10.1061/(ASCE)1090-0241(2006)132:2(131)
    Publisher: American Society of Civil Engineers
    Abstract: The concept of the suction stress characteristic curve (SSCC) for unsaturated soil is presented. Particle-scale equilibrium analyses are employed to distinguish three types of interparticle forces: (1) active forces transmitted through the soil grains; (2) active forces at or near interparticle contacts; and (3) passive, or counterbalancing, forces at or near interparticle contacts. It is proposed that the second type of force, which includes physicochemical forces, cementation forces, surface tension forces, and the force arising from negative pore-water pressure, may be conceptually combined into a macroscopic stress called suction stress. Suction stress characteristically depends on degree of saturation, water content, or matric suction through the SSCC, thus paralleling well-established concepts of the soil–water characteristic curve and hydraulic conductivity function for unsaturated soils. The existence and behavior of the SSCC are experimentally validated by considering unsaturated shear strength data for a variety of soil types in the literature. Its characteristic nature and a methodology for its determination are demonstrated. The experimental evidence shows that both Mohr–Coulomb failure and critical state failure can be well represented by the SSCC concept. The SSCC provides a potentially simple and practical way to describe the state of stress in unsaturated soil.
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      Suction Stress Characteristic Curve for Unsaturated Soil

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    http://yetl.yabesh.ir/yetl1/handle/yetl/52847
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    contributor authorNing Lu
    contributor authorWilliam J. Likos
    date accessioned2017-05-08T21:28:28Z
    date available2017-05-08T21:28:28Z
    date copyrightFebruary 2006
    date issued2006
    identifier other%28asce%291090-0241%282006%29132%3A2%28131%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/52847
    description abstractThe concept of the suction stress characteristic curve (SSCC) for unsaturated soil is presented. Particle-scale equilibrium analyses are employed to distinguish three types of interparticle forces: (1) active forces transmitted through the soil grains; (2) active forces at or near interparticle contacts; and (3) passive, or counterbalancing, forces at or near interparticle contacts. It is proposed that the second type of force, which includes physicochemical forces, cementation forces, surface tension forces, and the force arising from negative pore-water pressure, may be conceptually combined into a macroscopic stress called suction stress. Suction stress characteristically depends on degree of saturation, water content, or matric suction through the SSCC, thus paralleling well-established concepts of the soil–water characteristic curve and hydraulic conductivity function for unsaturated soils. The existence and behavior of the SSCC are experimentally validated by considering unsaturated shear strength data for a variety of soil types in the literature. Its characteristic nature and a methodology for its determination are demonstrated. The experimental evidence shows that both Mohr–Coulomb failure and critical state failure can be well represented by the SSCC concept. The SSCC provides a potentially simple and practical way to describe the state of stress in unsaturated soil.
    publisherAmerican Society of Civil Engineers
    titleSuction Stress Characteristic Curve for Unsaturated Soil
    typeJournal Paper
    journal volume132
    journal issue2
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)1090-0241(2006)132:2(131)
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2006:;Volume ( 132 ):;issue: 002
    contenttypeFulltext
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