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An incrementally non-linear model fo...

Tu, Xuxin.

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An incrementally non-linear model for clays with directional stiffness and a small strain emphasis.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	An incrementally non-linear model for clays with directional stiffness and a small strain emphasis./
Author:	Tu, Xuxin.
Description:	233 p.
Notes:	Adviser: Richard J. Finno.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3251918

An incrementally non-linear model for clays with directional stiffness and a small strain emphasis.
Tu, Xuxin.

An incrementally non-linear model for clays with directional stiffness and a small strain emphasis. - 233 p.

Adviser: Richard J. Finno.

Thesis (Ph.D.)--Northwestern University, 2007.

In response to construction activities and loads from permanent structures, soil generally is subjected to a variety of loading modes varying both in time and location. It also has been increasingly appreciated that the strains around well-designed foundations, excavations and tunnels are mostly small, with soil responses at this strain level generally being non-linear and anisotropic. To make accurate prediction of the performance of a geo-system, it is highly desirable to understand soil behavior at small strains along multiple loading directions, and accordingly to incorporate these responses in an appropriate constitutive model implemented in a finite element analysis.Subjects--Topical Terms:

783781
Engineering, Civil.

An incrementally non-linear model for clays with directional stiffness and a small strain emphasis.
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035 $a (UMI)AAI3251918
035 $a AAI3251918
040 $a UMI $c UMI
100 1 $a Tu, Xuxin. $3 1278367
245 1 3 $a An incrementally non-linear model for clays with directional stiffness and a small strain emphasis.
300 $a 233 p.
500 $a Adviser: Richard J. Finno.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1160.
502 $a Thesis (Ph.D.)--Northwestern University, 2007.
520 $a In response to construction activities and loads from permanent structures, soil generally is subjected to a variety of loading modes varying both in time and location. It also has been increasingly appreciated that the strains around well-designed foundations, excavations and tunnels are mostly small, with soil responses at this strain level generally being non-linear and anisotropic. To make accurate prediction of the performance of a geo-system, it is highly desirable to understand soil behavior at small strains along multiple loading directions, and accordingly to incorporate these responses in an appropriate constitutive model implemented in a finite element analysis.
520 $a This dissertation presents a model based on a series of stress probe tests with small strain measurements performed on compressible Chicago glacial clays. The proposed model is formulated in an original constitutive framework, in which the tangent stiffness matrix is constructed in accordance with the mechanical nature of frictional materials and the tangent moduli therein are described explicitly. The stiffness description includes evolution relations with regard to length of stress path, and directionality relations in terms of stress path direction. The former relations provide distinctive definitions for small-strain and large-strain behaviors, and distinguish soil responses in shearing and compression. The latter relations make this model incrementally non-linear and thus capable of modeling inelastic behavior.
520 $a A new algorithm based on a classical substepping scheme is developed to numerically integrate this model. A consistent tangent matrix is derived for the proposed model with the upgraded substepping scheme. The code is written in FORTRAN and implemented in FEM via UMAT of ABAQUS. The model is exercised in a variety of applications ranging from oedometer, triaxial and biaxial test simulations to a C-class prediction for a well-instrumented excavation. The computed results indicate that this model is successful in reproducing soil responses in both laboratory and field situations.
590 $a School code: 0163.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Geophysics. $3 535228
650 4 $a Geotechnology. $3 1018558
690 $a 0373
690 $a 0428
690 $a 0543
710 2 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0163
790 1 0 $a Finno, Richard J., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3251918