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Expansion of Long Cylindrical Cavities in Nonlinear Dilatant Media.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Expansion of Long Cylindrical Cavities in Nonlinear Dilatant Media./
Author:	Sayed, Sayed Mourad.
Description:	1 online resource (208 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 43-07, Section: B.
Contained By:	Dissertations Abstracts International43-07B.
Subject:	Civil engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798204419469

Expansion of Long Cylindrical Cavities in Nonlinear Dilatant Media.
Sayed, Sayed Mourad.

Expansion of Long Cylindrical Cavities in Nonlinear Dilatant Media. - 1 online resource (208 pages)

Source: Dissertations Abstracts International, Volume: 43-07, Section: B.

Thesis (Ph.D.)--Duke University, 1982.

Includes bibliographical references

The present study was undertaken with the aim of developing new solutions for the problem of expansion of a long cylindrical cavity, which would be based on a more realistic idealization of the soil behavior. The new solutions are used to formulate improved interpretation methods for the pressuremeter test as well as new, more reliable design criteria for stone columns and bored piles. In the development of the improved interpretation method of the pressuremeter test, the geometric nonlinear soil behavior is accounted for, by adopting a nonlinear strain-displacement relationship (Eulerian form). Also the volume changes of the soil during the expansion are incorporated according to actual experimentally observed patterns and without the use of any theoretical constitutive model. However in the development of the general solution, which provides an elaborate design procedure for stone columns and bored piles, the soil is assumed to behave as a nonlinear elastic-plastic solid following the Coulomb-Mohr failure criterion and exhibiting arbitrary volume change-strain characteristics in the plastic stage. Also the nonlinear strain-displacement relations (Eulerian forms) for small strains are adopted to introduce the geometric nonlinearity of soil behavior. Numerical examples showing the use of the derived solutions are presented. The analyses and applications demonstrate the importance of the nonlinear nature of soil behavior. The developed solutions consider such nature and incorporate the nonlinearities of volume change-strain characteristics, strain-displacement relationships and stress-strain curve. Using the improved interpretation method, the shear stress-strain curve and the angle of internal friction can be derived using the measured soil response from a self-boring pressuremeter test provided that adequate information on volume change behavior is secured. Such information can be deduced from octahedral plane strain compression tests in the laboratory and also by soil resistivity tests during the pressuremeter test in the field. Although the method was developed to provide a rational analysis for the drained condition, it does elaborate the analysis for undrained condition too. The general solution provides a reliable design criterion for the stone columns and bored piles. It reveals very important aspects concerning the determination of the deformation modulus using the pressuremeter test results along with the linear theory of elasticity. New concepts have been gained regarding the effects of the boundaries and the limitation of the linear elastic model.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798204419469Subjects--Topical Terms:

561339
Civil engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Expansion of Long Cylindrical Cavities in Nonlinear Dilatant Media.
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100 1 $a Sayed, Sayed Mourad. $3 1469329
245 1 0 $a Expansion of Long Cylindrical Cavities in Nonlinear Dilatant Media.
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300 $a 1 online resource (208 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 43-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--Duke University, 1982.
504 $a Includes bibliographical references
520 $a The present study was undertaken with the aim of developing new solutions for the problem of expansion of a long cylindrical cavity, which would be based on a more realistic idealization of the soil behavior. The new solutions are used to formulate improved interpretation methods for the pressuremeter test as well as new, more reliable design criteria for stone columns and bored piles. In the development of the improved interpretation method of the pressuremeter test, the geometric nonlinear soil behavior is accounted for, by adopting a nonlinear strain-displacement relationship (Eulerian form). Also the volume changes of the soil during the expansion are incorporated according to actual experimentally observed patterns and without the use of any theoretical constitutive model. However in the development of the general solution, which provides an elaborate design procedure for stone columns and bored piles, the soil is assumed to behave as a nonlinear elastic-plastic solid following the Coulomb-Mohr failure criterion and exhibiting arbitrary volume change-strain characteristics in the plastic stage. Also the nonlinear strain-displacement relations (Eulerian forms) for small strains are adopted to introduce the geometric nonlinearity of soil behavior. Numerical examples showing the use of the derived solutions are presented. The analyses and applications demonstrate the importance of the nonlinear nature of soil behavior. The developed solutions consider such nature and incorporate the nonlinearities of volume change-strain characteristics, strain-displacement relationships and stress-strain curve. Using the improved interpretation method, the shear stress-strain curve and the angle of internal friction can be derived using the measured soil response from a self-boring pressuremeter test provided that adequate information on volume change behavior is secured. Such information can be deduced from octahedral plane strain compression tests in the laboratory and also by soil resistivity tests during the pressuremeter test in the field. Although the method was developed to provide a rational analysis for the drained condition, it does elaborate the analysis for undrained condition too. The general solution provides a reliable design criterion for the stone columns and bored piles. It reveals very important aspects concerning the determination of the deformation modulus using the pressuremeter test results along with the linear theory of elasticity. New concepts have been gained regarding the effects of the boundaries and the limitation of the linear elastic model.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
655 7 $a Electronic books. $2 local $3 554714
690 $a 0543
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Duke University. $3 1191298
773 0 $t Dissertations Abstracts International $g 43-07B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8221154 $z click for full text (PQDT)