Volume 39, Issue 5 (September 2011)

    Energy-Based Method for Analyzing the Collapse Characteristics of Silt Subjected to Changes of Principal Stress Orientation

    (Received 26 September 2010; accepted 18 March 2011)

    Published Online: 2011

    CODEN: JTEOAD

      Format Pages Price  
    PDF 6 $25   ADD TO CART


    Abstract

    When soils are subjected to dynamic loadings, their stress states not only alter in stress ratios but also in principal stress orientations cyclically. Under these complicated stress paths the pore water pressure of soils may develop to the level of liquefaction even at a relatively low shear stress ratio. Therefore, to investigate the characteristics of pore water pressure buildup under such stress paths, a series of experiments were conducted with hollow cylinder apparatus. The samples are saturated silt from the sea entrance of Yangtze River with the relative densities of 70 and 30 %. The tests employed three kinds of cyclic loading schemes including changes of principal stress orientation (i.e., cyclic triaxial, torsion shear, and principal stress rotation tests). According to the testing results, the dissipation energy (accumulated shear work per unit volume) was calculated for each sample. It was found that the influences of cyclic stress ratio, frequency, relative density and cyclic stress path on the pore water pressure buildup were analyzed. In light of the concept of collapse, the collapse energy was proposed as a dynamic strength criterion. Subsequently, an energy-based pore water pressure model was proposed, whose parameters could reflect the collapse energy and rate of pore water pressure buildup.


    Author Information:

    Yan, Jun
    Master Candidate, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing,

    Shen, Yang
    Associate Professor, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing,

    Huang, Guofa
    Master Candidate, Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing,

    Yang, Gui
    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Geotechnical Research Institute, Hohai University, Nanjing,


    Stock #: JTE103391

    ISSN: 0090-3973

    DOI: 10.1520/JTE103391

    ASTM International is a member of CrossRef.

    Author
    Title Energy-Based Method for Analyzing the Collapse Characteristics of Silt Subjected to Changes of Principal Stress Orientation
    Symposium , 0000-00-00
    Committee D18