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    Spatial Variability in Soils: High Resolution Assessment with Electrical Needle Probe

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2004:;Volume ( 130 ):;issue: 008
    Author:
    Gye Chun Cho
    ,
    Jong-Sub Lee
    ,
    J. Carlos Santamarina
    DOI: 10.1061/(ASCE)1090-0241(2004)130:8(843)
    Publisher: American Society of Civil Engineers
    Abstract: The global response of a soil is affected by spatial as well as temporal scales. An electrical needle-size probe is developed to effectively assess one-dimensional spatial variability. The probe is designed for laboratory specimens (needle diameter 1.2–2.2 mm), and it can be scaled for field applications. Design considerations include the tip shape, insertion disturbance, electrochemical effects, corrosion, operating frequency, and electrical resonance. Two calibration methods are presented to determine local soil permittivity and resistivity from the measured complex impedance; the simplified calibration procedure is based on resistance measurements only. The local electrical parameters permit one to infer the soil porosity and the electrolyte conductivity. The attainable spatial resolution depends on the needle diameter; submillimetric resolution is typically achieved in laboratory applications. Reconstituted sand specimens and undisturbed clayey specimens are tested to explore the resolution potential of this probe. The electrical needle probe clearly detects the spatial variability that results from different specimen preparation methods in sands and soil layering from natural formation histories such as those in varved clays.
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      Spatial Variability in Soils: High Resolution Assessment with Electrical Needle Probe

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/52551
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    • Journal of Geotechnical and Geoenvironmental Engineering

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    contributor authorGye Chun Cho
    contributor authorJong-Sub Lee
    contributor authorJ. Carlos Santamarina
    date accessioned2017-05-08T21:28:01Z
    date available2017-05-08T21:28:01Z
    date copyrightAugust 2004
    date issued2004
    identifier other%28asce%291090-0241%282004%29130%3A8%28843%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/52551
    description abstractThe global response of a soil is affected by spatial as well as temporal scales. An electrical needle-size probe is developed to effectively assess one-dimensional spatial variability. The probe is designed for laboratory specimens (needle diameter 1.2–2.2 mm), and it can be scaled for field applications. Design considerations include the tip shape, insertion disturbance, electrochemical effects, corrosion, operating frequency, and electrical resonance. Two calibration methods are presented to determine local soil permittivity and resistivity from the measured complex impedance; the simplified calibration procedure is based on resistance measurements only. The local electrical parameters permit one to infer the soil porosity and the electrolyte conductivity. The attainable spatial resolution depends on the needle diameter; submillimetric resolution is typically achieved in laboratory applications. Reconstituted sand specimens and undisturbed clayey specimens are tested to explore the resolution potential of this probe. The electrical needle probe clearly detects the spatial variability that results from different specimen preparation methods in sands and soil layering from natural formation histories such as those in varved clays.
    publisherAmerican Society of Civil Engineers
    titleSpatial Variability in Soils: High Resolution Assessment with Electrical Needle Probe
    typeJournal Paper
    journal volume130
    journal issue8
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)1090-0241(2004)130:8(843)
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2004:;Volume ( 130 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian