Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns

查看全文 作　　者：Yuan-yu [1]DUAN;Yi-ping [1]ZHANG;Dave [2]CHAN;Ya-nan [1]YU

机构地区：[1]College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;[2]Department of Civil and Environmental Engineering,University of Alberta,Edmonton,Alberta,Canada

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》索引2012年第13卷第7期,共13页

基　　金：Project (No. 2011FZA4021) supported by the Fundamental Research Funds for the Central Universities, China 摘　　要：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. 关键词：Geosynthetic-encased columns (GECs) Equal vertical strain Elastoplastic deformation Analytical procedure

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Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns

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