Theoretical elastoplastic analysis for foundations with geosynthetic-encased columns

作     者：Yuan-yu DUAN Yi-ping ZHANG Dave CHAN Ya-nan YU 

作者机构：College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Department of Civil and Environmental EngineeringUniversity of AlbertaEdmontonAlbertaCanada 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2012年第13卷第7期

页      面：506-518页

核心收录：

学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 

基　　金：Project (No. 2011FZA4021) supported by the Fundamental Research Funds for the Central Universities  China 

主　　题：Geosynthetic-encased columns (GECs) Equal vertical strain Elastoplastic deformation Analytical procedure 

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.