Volume 30, Issue 4 (July 2007)

    Experimental Study on Fracture Behaviorqa of a Silty Clay

    (Received 27 June 2006; accepted 1 November 2006)

    Published Online: 2006

    CODEN: GTJOAD

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    Abstract

    Fracture toughness KIC and KIIC are two important parameters in fracture mechanics. In this paper, a device was designed to perform improved three-point and four-point unsymmetrical bending tests on soil beams. The device can easily remove the influence of specimen self-weight on the test results. Using the improved methods and the device, KIC, KIIC, and mixed mode I-II stress intensity factors KI and KII at fracture failure of a compacted silty clay were investigated. Test results indicated that the fracture of the silty clay exhibits linear and elastic behavior. The influences of dry density, water content, and preconsolidation pressure of specimens on parameter KIC were investigated. It was found that the classical mixed mode I-II fracture failure theories such as the strain energy density factor theory, maximum circumferential stress theory, and energy release rate theory cannot adequately predict the fracture failure behavior of the specimens, but a circle agrees well with the test results. The directions of crack growing in the specimens under mode II and mixed mode I-II loading conditions were expressed by a linear function of KI/KII.


    Author Information:

    Wang, Jun-Jie
    Associate Professor, College of River & Ocean Engineering, Chongqing Jiaotong University, Nan’an District, Chongqing

    Zhu, Jun-Gao
    Professor and Associate Professor, Research Institute of Geotechnical Engineering, Hohai University, Nanjing

    Chiu, C. F.
    Professor and Associate Professor, Research Institute of Geotechnical Engineering, Hohai University, Nanjing

    Chai, He-Jun
    Professor, Research & Design Institute of Chongqing Communication, Nan’an District, Chongqing


    Stock #: GTJ100715

    ISSN: 0149-6115

    DOI: 10.1520/GTJ100715

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    Author
    Title Experimental Study on Fracture Behaviorqa of a Silty Clay
    Symposium , 0000-00-00
    Committee D18