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    Failure Properties of Fractured Rock Masses as Anisotropic Homogenized Media

    Source: Journal of Engineering Mechanics:;2002:;Volume ( 128 ):;issue: 008
    Author:
    P. de Buhan
    ,
    J. Fréard
    ,
    D. Garnier
    ,
    S. Maghous
    DOI: 10.1061/(ASCE)0733-9399(2002)128:8(869)
    Publisher: American Society of Civil Engineers
    Abstract: Conceived as a potential alternative to the classical design methods employed for analyzing the stability of jointed rock structures, the homogenization approach advocated in this contribution stems from the intuitive idea that, from a macroscopic point of view, a rock mass intersected by a network of joint surfaces may be perceived as a homogeneous medium. The strength criterion of the latter can be theoretically determined from the knowledge of the failure conditions of the individual constituents, namely, rock matrix and joint interfaces. It turns out that, as could be expected, this criterion is of the anisotropic cohesive frictional type, as shown by the closed-form expressions obtained in the case of two mutually orthogonal joint families. While it appears that such a homogenization concept is well suited for densely fractured rock masses, a significant “scale effect” may prevail in the case of structures involving a relatively low number of joints. It is conjectured that a possible way to capture such a scale effect, while still keeping advantage of the homogenization approach, is to adopt a description of the fractured rock mass as a Cosserat or micropolar continuum. This is achieved by proposing a formulation of the macroscopic failure condition in terms of stresses and couple stresses. Such a generalized homogenization method is then applied to a simple illustrative example.
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      Failure Properties of Fractured Rock Masses as Anisotropic Homogenized Media

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    http://yetl.yabesh.ir/yetl1/handle/yetl/85602
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    contributor authorP. de Buhan
    contributor authorJ. Fréard
    contributor authorD. Garnier
    contributor authorS. Maghous
    date accessioned2017-05-08T22:39:53Z
    date available2017-05-08T22:39:53Z
    date copyrightAugust 2002
    date issued2002
    identifier other%28asce%290733-9399%282002%29128%3A8%28869%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/85602
    description abstractConceived as a potential alternative to the classical design methods employed for analyzing the stability of jointed rock structures, the homogenization approach advocated in this contribution stems from the intuitive idea that, from a macroscopic point of view, a rock mass intersected by a network of joint surfaces may be perceived as a homogeneous medium. The strength criterion of the latter can be theoretically determined from the knowledge of the failure conditions of the individual constituents, namely, rock matrix and joint interfaces. It turns out that, as could be expected, this criterion is of the anisotropic cohesive frictional type, as shown by the closed-form expressions obtained in the case of two mutually orthogonal joint families. While it appears that such a homogenization concept is well suited for densely fractured rock masses, a significant “scale effect” may prevail in the case of structures involving a relatively low number of joints. It is conjectured that a possible way to capture such a scale effect, while still keeping advantage of the homogenization approach, is to adopt a description of the fractured rock mass as a Cosserat or micropolar continuum. This is achieved by proposing a formulation of the macroscopic failure condition in terms of stresses and couple stresses. Such a generalized homogenization method is then applied to a simple illustrative example.
    publisherAmerican Society of Civil Engineers
    titleFailure Properties of Fractured Rock Masses as Anisotropic Homogenized Media
    typeJournal Paper
    journal volume128
    journal issue8
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(2002)128:8(869)
    treeJournal of Engineering Mechanics:;2002:;Volume ( 128 ):;issue: 008
    contenttypeFulltext
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