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Dynamic properties of natural soils.

Hwang, Seon Keun.

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Dynamic properties of natural soils.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Dynamic properties of natural soils./
作者:	Hwang, Seon Keun.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1997,
面頁冊數:	395 p.
附註:	Source: Dissertation Abstracts International, Volume: 58-07, Section: B, page: 3907.
Contained By:	Dissertation Abstracts International58-07B.
標題:	Geotechnology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9802908
ISBN:	9780591529487

Dynamic properties of natural soils.
Hwang, Seon Keun.

Dynamic properties of natural soils. - Ann Arbor : ProQuest Dissertations & Theses, 1997 - 395 p.

Source: Dissertation Abstracts International, Volume: 58-07, Section: B, page: 3907.

Thesis (Ph.D.)--The University of Texas at Austin, 1997.

Dynamic properties of undisturbed soils (shear modulus, G, and material damping ratio, D) are essential parameters in the design of soil-structure systems subjected to dynamic loadings. Measurement of these properties in the laboratory often requires significant effort and expense. Two laboratory methods for this purpose are the resonant column (RC) and torsional shear (TS) tests. The main objective of this study is the laboratory investigation of the dynamic properties of undisturbed soil specimens expressed in terms of G and D. For this purpose, Forty-five natural specimens were tested. Their physical properties were determined, and their dynamic properties were studied using combined RC and TS tests. In addition to measuring dynamic soil properties, the compliance associated with the TS and RC equipment was identified and quantified. This compliance, which manifested itself mainly in equipment-generated damping, was properly taken into account in the dynamic measurements to obtain accurate soil properties.

ISBN: 9780591529487Subjects--Topical Terms:

1018558
Geotechnology.

Dynamic properties of natural soils.
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245 1 0 $a Dynamic properties of natural soils.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1997
300 $a 395 p.
500 $a Source: Dissertation Abstracts International, Volume: 58-07, Section: B, page: 3907.
500 $a Supervisor: Kenneth H. Stokoe II.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 1997.
520 $a Dynamic properties of undisturbed soils (shear modulus, G, and material damping ratio, D) are essential parameters in the design of soil-structure systems subjected to dynamic loadings. Measurement of these properties in the laboratory often requires significant effort and expense. Two laboratory methods for this purpose are the resonant column (RC) and torsional shear (TS) tests. The main objective of this study is the laboratory investigation of the dynamic properties of undisturbed soil specimens expressed in terms of G and D. For this purpose, Forty-five natural specimens were tested. Their physical properties were determined, and their dynamic properties were studied using combined RC and TS tests. In addition to measuring dynamic soil properties, the compliance associated with the TS and RC equipment was identified and quantified. This compliance, which manifested itself mainly in equipment-generated damping, was properly taken into account in the dynamic measurements to obtain accurate soil properties.
520 $a An empirical equation for predicting G$\rm\sb{max}$ was developed. Correlations between coefficients used in this equation and physical properties were found using linear regression analysis. Predicted G$\rm\sb{max}$ values with the proposed equation agreed well with test results. The excitation frequency was found to have only a small effect on G$\rm\sb{max}.$.
520 $a An empirical equation for predicting D$\rm\sb{min}$ was also found. Correlations between the coefficients used in this equation and physical properties were investigated. The excitation frequency was found to have a significant effect on D$\rm\sb{min}.$ It was found that plasticity index and void ratio are also important variables affecting D$\rm\sb{min}.$.
520 $a Nonlinear characteristics of G and D were investigated. A new empirical equation for reference strain, $\rm\gamma\sb{r},$ was developed. Coefficients used in this equation were obtained by multiple linear regression analysis. The shear modulus reduction curve was well predicted with $\rm\gamma\sb{r}.$ Also, nonlinear D of soils was well represented by an inverse linear function of log G/G$\rm\sb{max}.$ It is concluded that, for natural soils, values of G and D over a wide range in shearing strains ($$0.2%) can be predicted quite well using several physical characteristics with the empirical equations developed in this study.
590 $a School code: 0227.
650 4 $a Geotechnology. $3 1018558
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710 2 $a The University of Texas at Austin. $3 718984
773 0 $t Dissertation Abstracts International $g 58-07B.
790 $a 0227
791 $a Ph.D.
792 $a 1997
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9802908