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CLC number: TU4

On-line Access: 2012-07-03

Received: 2011-12-19

Revision Accepted: 2012-05-15

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.7 P.506-518

10.1631/jzus.A1100334


Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns


Author(s):  Yuan-yu Duan, Yi-ping Zhang, Dave Chan, Ya-nan Yu

Affiliation(s):  College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   zhangyiping@zju.edu.cn

Key Words:  Geosynthetic-encased columns (GECs), Equal vertical strain, Elastoplastic deformation, Analytical procedure


Yuan-yu Duan, Yi-ping Zhang, Dave Chan, Ya-nan Yu. Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns[J]. Journal of Zhejiang University Science A, 2012, 13(7): 506-518.

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author="Yuan-yu Duan, Yi-ping Zhang, Dave Chan, Ya-nan Yu",
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%T Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns
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%A Yi-ping Zhang
%A Dave Chan
%A Ya-nan Yu
%J Journal of Zhejiang University SCIENCE A
%V 13
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%P 506-518
%@ 1673-565X
%D 2012
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1100334

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T1 - Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns
A1 - Yuan-yu Duan
A1 - Yi-ping Zhang
A1 - Dave Chan
A1 - Ya-nan Yu
J0 - Journal of Zhejiang University Science A
VL - 13
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EP - 518
%@ 1673-565X
Y1 - 2012
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1100334


Abstract: 
As a new technique in ground improvement, geosynthetic-encased columns (GECs) have promising applications in soft soil foundation. By assuming yielding occurs in the columns while the surrounding soil and the geosynthetic remain elastic, an elastoplastic analytical procedure for foundations improved by GECs is proposed. The radial stresses that the geosynthetic provides and the elastoplastic deformations of the foundation resting on a rigid base are derived. A comparison with finite element analysis shows that the proposed method is effective and can provide a reasonable prediction of a GEC’s deformation. Subsequent parametric analysis indicates that higher geosynthetic stiffness leads to better performance of the composite foundation. The optimum length of encasement is related to the load acting on the foundation and the permissible vertical and radial displacements of the column. Moreover, as the dilation angle of the column increases, the settlement decreases, especially under high loading. The influence of the encasement is more significant in soils with smaller elastic modulus.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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