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    Low Strain Integrity Testing of Piles: Three-Dimensional Effects

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2003:;Volume ( 129 ):;issue: 011
    Author:
    Y. K. Chow
    ,
    K. K. Phoon
    ,
    W. F. Chow
    ,
    K. Y. Wong
    DOI: 10.1061/(ASCE)1090-0241(2003)129:11(1057)
    Publisher: American Society of Civil Engineers
    Abstract: Results of low strain integrity testing of piles are normally interpreted using one-dimensional (1D) stress wave theory. While 1D stress wave theory is acceptable for pile-driving analysis, it may not adequately simulate the response of piles in sonic integrity tests where the hammer is small in relation to the size of the pile. Extensive parametric studies were performed using 1D and 3D (axisymmetric) wave equation models to study this problem. The main 3D effect in intact piles lies in the initial velocity response that becomes negative after the first positive peak. This response resembles that of a pile with an anomaly near the pile head. If this is not recognized, it will lead to a wrong assessment of the pile condition with attendant cost implications. This potential source of error can be removed by maintaining a distance between hammer and receiver that is greater than 50% of the pile radius.
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      Low Strain Integrity Testing of Piles: Three-Dimensional Effects

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/52270
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    • Journal of Geotechnical and Geoenvironmental Engineering

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    contributor authorY. K. Chow
    contributor authorK. K. Phoon
    contributor authorW. F. Chow
    contributor authorK. Y. Wong
    date accessioned2017-05-08T21:27:36Z
    date available2017-05-08T21:27:36Z
    date copyrightNovember 2003
    date issued2003
    identifier other%28asce%291090-0241%282003%29129%3A11%281057%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/52270
    description abstractResults of low strain integrity testing of piles are normally interpreted using one-dimensional (1D) stress wave theory. While 1D stress wave theory is acceptable for pile-driving analysis, it may not adequately simulate the response of piles in sonic integrity tests where the hammer is small in relation to the size of the pile. Extensive parametric studies were performed using 1D and 3D (axisymmetric) wave equation models to study this problem. The main 3D effect in intact piles lies in the initial velocity response that becomes negative after the first positive peak. This response resembles that of a pile with an anomaly near the pile head. If this is not recognized, it will lead to a wrong assessment of the pile condition with attendant cost implications. This potential source of error can be removed by maintaining a distance between hammer and receiver that is greater than 50% of the pile radius.
    publisherAmerican Society of Civil Engineers
    titleLow Strain Integrity Testing of Piles: Three-Dimensional Effects
    typeJournal Paper
    journal volume129
    journal issue11
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)1090-0241(2003)129:11(1057)
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2003:;Volume ( 129 ):;issue: 011
    contenttypeFulltext
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