A simplified approach for evaluating the bearing performance of encased granular columns

被引:31
作者
Wu, Cho-Sen [1 ]
Hong, Yung-Shan [1 ]
机构
[1] Tamkang Univ, Dept Civil Engn, Taipei 25137, Taiwan
关键词
Encased granular columns; Geosynthetics; Simplified approach; Confining pressure increment; Dilation rate; Constant volume; BEHAVIOR;
D O I
10.1016/j.geotexmem.2014.05.006
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Tensile resistant materials used to encase cylindrical granular columns significantly improve column strength. For an encased granular column subjected to axial load, the axial deformation and volumetric expansion causes lateral expansion, which induces circumferential strain and stress in the encasement and provides additional confining pressure to the column. To make good predictions of column behavior through numerical analysis, elaborate deductive and regressive work is needed to describe the mechanical properties of the filled material. This study analyzes the bearing performance of geosynthetic-encased sand columns using a simplified approach to reduce such laborious deductive efforts. A few equations and calculation steps are also proposed to evaluate the confining pressure increments and deviatoric stress due to encasement extension. The proposed approach employs an empirical correlation between the dilation rate and deviatoric strain of pure sand to evaluate the volumetric strain of deformed encased granular columns. The approach has also been extended to evaluate the use of the constant volume assumption in predicting the responses of encased granular columns. The relationships between the confining pressure increment and encasement stiffness/column diameter ratio are established through simplified assumptions. Results obtained from the proposed approach are validated and found to be in good agreement with the experimental measurements and numerically analysis results under rigorous parameter acquisition. The proposed approach provides accurate results without laborious analytical efforts. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:339 / 347
页数:9
相关论文
共 23 条
[1]  
Alexiew D., 2005, Proceeding of the Geo-Frontiers 2005 Congress, Austin, Texas, P1, DOI [10.1061/40777(156)12, DOI 10.1061/40777(156)12]
[2]   Behavior of stone columns based on experimental and FEM analysis [J].
Ambily, A. P. ;
Gandhi, Shailesh R. .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2007, 133 (04) :405-415
[3]   Behaviour of geosynthetic-encased granular columns in porous collapsible soil [J].
Araujo, G. L. S. ;
Palmeira, E. M. ;
Cunha, R. P. .
GEOSYNTHETICS INTERNATIONAL, 2009, 16 (06) :433-451
[4]  
Bathurst R.J., 1993, ASTM GEOTECH TEST J, V16, P296, DOI DOI 10.1520/GTJ10050J
[5]  
Canetta G., 1989, Computers and Geotechnics, V7, P99, DOI 10.1016/0266-352X(89)90009-8
[6]  
de Mello L.G., 2008, Proceedings of 1st Pan-American Geosynthetics Conference, Cancun, P1332
[7]   Numerical analysis of geosynthetic-reinforced and pile-supported earth platforms over soft soil [J].
Han, J ;
Gabr, MA .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2002, 128 (01) :44-53
[8]   Performance of encased granular columns considering shear-induced volumetric dilation of the fill material [J].
Hong, Y. -S. .
GEOSYNTHETICS INTERNATIONAL, 2012, 19 (06) :438-452
[9]  
Kempfert HG, 1997, FOURTEENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, VOL 3, P1757
[10]  
Lee JS, 1998, INT J NUMER ANAL MET, V22, P1001, DOI 10.1002/(SICI)1096-9853(199812)22:12<1001::AID-NAG955>3.3.CO