A simplified approach for evaluating the bearing performance of encased granular columns
學年 103
學期 1
出版（發表）日期 2014-08-01
作品名稱 A simplified approach for evaluating the bearing performance of encased granular columns
作品名稱（其他語言）
著者 吳朝賢; 洪勇善
單位 淡江大學土木工程學系
出版者 London: Elsevier Ltd
著錄名稱、卷期、頁數 Geotextiles and Geomembranes 42(4), pp.339-347
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.
關鍵字 Encased granular columns; Geosynthetics; Simplified approach; Confining pressure increment; Dilation rate; Constant volume
語言 en_US
ISSN 0266-1144
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 洪勇善
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/100729 )

機構典藏連結