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Generation of low-frequency Rayleigh...

Gucunski, Nenad.

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Generation of low-frequency Rayleigh waves for the spectral analysis of surface waves method.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Generation of low-frequency Rayleigh waves for the spectral analysis of surface waves method./
作者:	Gucunski, Nenad.
面頁冊數:	347 p.
附註:	Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page: 1600.
Contained By:	Dissertation Abstracts International52-03B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9124015

Generation of low-frequency Rayleigh waves for the spectral analysis of surface waves method.
Gucunski, Nenad.

Generation of low-frequency Rayleigh waves for the spectral analysis of surface waves method. - 347 p.

Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page: 1600.

Thesis (Ph.D.)--University of Michigan, 1991.

The Spectral-Analysis-of-Surface-Waves (SASW) method is used for in situ evaluation of elastic shear modulus in layered soils and pavements. The advantages are: it is performed from the surface (not requiring boreholes), it is nondestructive, it utilizes a simple procedure and test setup, and is usually very accurate. The major deficiencies of the method involve inversion of the dispersion curve, and limitations in depth of evaluation. The inversion process is inadequate because it is time consuming and it may be ambiguous at sites with irregular soil profiles, i.e. profiles in which shear wave velocity does not necessarily increase with depth. Limitations in evaluation of properties of deep soil deposits result from inability to generate sufficiently strong, low frequency Rayleigh waves. The purpose of this research was to explore elements for design of an impact device for generation of low frequency Rayleigh waves, and evaluation of Rayleigh wave dispersion in irregular soil profiles.Subjects--Topical Terms:

783781
Engineering, Civil.

Generation of low-frequency Rayleigh waves for the spectral analysis of surface waves method.
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008 130610s1991 eng d
035 $a (UnM)AAI9124015
035 $a AAI9124015
040 $a UnM $c UnM
100 1 $a Gucunski, Nenad. $3 1905829
245 1 0 $a Generation of low-frequency Rayleigh waves for the spectral analysis of surface waves method.
300 $a 347 p.
500 $a Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page: 1600.
500 $a Chairman: Richard D. Woods.
502 $a Thesis (Ph.D.)--University of Michigan, 1991.
520 $a The Spectral-Analysis-of-Surface-Waves (SASW) method is used for in situ evaluation of elastic shear modulus in layered soils and pavements. The advantages are: it is performed from the surface (not requiring boreholes), it is nondestructive, it utilizes a simple procedure and test setup, and is usually very accurate. The major deficiencies of the method involve inversion of the dispersion curve, and limitations in depth of evaluation. The inversion process is inadequate because it is time consuming and it may be ambiguous at sites with irregular soil profiles, i.e. profiles in which shear wave velocity does not necessarily increase with depth. Limitations in evaluation of properties of deep soil deposits result from inability to generate sufficiently strong, low frequency Rayleigh waves. The purpose of this research was to explore elements for design of an impact device for generation of low frequency Rayleigh waves, and evaluation of Rayleigh wave dispersion in irregular soil profiles.
520 $a The research has three major parts: evaluation of Rayleigh wave dispersion in irregular soil profiles; the solution of vertical oscillations of a circular flexible plate on an elastic layered medium; and the analysis of the dynamics of a falling weight, impact device. The dispersion in irregular soil profiles was evaluated by numerical simulation of the SASW test. The evaluation of vertical oscillations of a flexible plate utilized the "ring method". For the overall evaluation of the stiffness matrix of the flexible plate-soil system, the stiffness matrix approach was used for the stiffness matrix of the soil system, while the Finite Difference Energy Method was used for the plate. Solutions of the first two parts were applied to the analysis of the impact device.
520 $a The major conclusions were: (1) the inversion process should be guided by multiple Rayleigh modes whenever possible, (2) transition of dominant influence from one Rayleigh mode to another is characterized by a localized approach of dispersion curves of two adjacent modes, (3) the response of flexible plates differs from the response of rigid plates in three ways (a) soil reaction distribution, (b) displacement distribution, and (c) variations in impedance functions.
590 $a School code: 0127.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Geology. $3 516570
650 4 $a Applied Mechanics. $3 1018410
690 $a 0543
690 $a 0372
690 $a 0346
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 52-03B.
790 1 0 $a Woods, Richard D., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 1991
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9124015