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High resolution geophysical techniqu...

Lee, Jong-Sub.

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High resolution geophysical techniques for small-scale soil model testing.

Record Type:	Electronic resources : Monograph/item
Title/Author:	High resolution geophysical techniques for small-scale soil model testing./
Author:	Lee, Jong-Sub.
Description:	280 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5099.
Contained By:	Dissertation Abstracts International64-10B.
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3110428

High resolution geophysical techniques for small-scale soil model testing.
Lee, Jong-Sub.

High resolution geophysical techniques for small-scale soil model testing. - 280 p.

Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5099.

Thesis (Ph.D.)--Georgia Institute of Technology, 2003.

This research focuses on the development and application of high resolution geophysical techniques, based on elastic and electromagnetic waves, for small-scale soil model characterization and process-monitoring. Emphasis is placed on systems that can operate during flight in centrifuge modeling. The second generation of an electrical resistivity needle probe takes into consideration tip shape and corrosion effects. It shows millimetric resolution. Unique results include the identification of layering and porosity changes after liquefaction. P-wave reflection imaging is scaled to small-scale soil models by optimizing the operating frequency and selecting the proper transducers. Emphasis is placed on detecting layers and inclusions in submerged soils. Bender elements are optimal transducers due to their soil-transducer coupling and their high frequency response. It is shown that the resonant frequency of bender element installations depends on the geometry of the bender element, its mounting and the soil stiffness. Multiple reflection techniques and signal matching techniques are developed to solve first arrival and near field issues. Bender element transducers are combined with simple, yet robust inversion algorithms to obtain tomographic images. Travel time S-wave tomography is implemented using pixel- and parametric-based representations. A plane-wave trans-illumination methodology for monitoring short-duration events is implemented whereby an array of transducers is excited at once and a similar array across the model acts as a projection screen. This system permits monitoring the evolution of liquefaction.Subjects--Topical Terms:

783781
Engineering, Civil.

High resolution geophysical techniques for small-scale soil model testing.
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008 130614s2003 eng d
035 $a (UnM)AAI3110428
035 $a AAI3110428
040 $a UnM $c UnM
100 1 $a Lee, Jong-Sub. $3 1953541
245 1 0 $a High resolution geophysical techniques for small-scale soil model testing.
300 $a 280 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5099.
500 $a Director: J. Carlos Santamarina.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2003.
520 $a This research focuses on the development and application of high resolution geophysical techniques, based on elastic and electromagnetic waves, for small-scale soil model characterization and process-monitoring. Emphasis is placed on systems that can operate during flight in centrifuge modeling. The second generation of an electrical resistivity needle probe takes into consideration tip shape and corrosion effects. It shows millimetric resolution. Unique results include the identification of layering and porosity changes after liquefaction. P-wave reflection imaging is scaled to small-scale soil models by optimizing the operating frequency and selecting the proper transducers. Emphasis is placed on detecting layers and inclusions in submerged soils. Bender elements are optimal transducers due to their soil-transducer coupling and their high frequency response. It is shown that the resonant frequency of bender element installations depends on the geometry of the bender element, its mounting and the soil stiffness. Multiple reflection techniques and signal matching techniques are developed to solve first arrival and near field issues. Bender element transducers are combined with simple, yet robust inversion algorithms to obtain tomographic images. Travel time S-wave tomography is implemented using pixel- and parametric-based representations. A plane-wave trans-illumination methodology for monitoring short-duration events is implemented whereby an array of transducers is excited at once and a similar array across the model acts as a projection screen. This system permits monitoring the evolution of liquefaction.
590 $a School code: 0078.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Geophysics. $3 535228
690 $a 0543
690 $a 0373
710 2 0 $a Georgia Institute of Technology. $3 696730
773 0 $t Dissertation Abstracts International $g 64-10B.
790 1 0 $a Santamarina, J. Carlos, $e advisor
790 $a 0078
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3110428