Verification of K-Stiffness Method For Polymer and Steel Grids Reinforcements in MSE Structures on Hard Foundation

• Main Authors: Chao-Ting Chen, 陳朝廷
• Other Authors: Shuh-Gi Chern
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/87130172283525030162

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 99 === In this study, the K-stiffness method which is used to calculate the reinforcement load of mechanically stabilized earth (MSE) structures on hard foundation was investigated to be applied for reinforced structures. The mechanically stabilized earth wall/embankment was constructed in Phitsanulok Province consisting of reinforced backfill with geosynthetics materials made of polymer geogrids and metallic reinforcements. The mechanism of reinforced earth involves the generation of frictional and bearing resistances at the interfaces between the soil and the reinforcement. This study also presents results of the laboratory large-scale direct shear test investigations on the interactions between soil and the reinforcements. The performances of grids reinforcements consisting of polyester (PET) and steel grids were compared using the K-stiffness method, FHWA method and AASHTO 2002 method. The results show that the K-stiffness method for internal design of polyester (PET) and steel grids of the mechanically stabilized earth (MSE) structures on hard foundation were verified. Consequently, the K-stiffness working stress method can be recommended for revisions of current conservative design method on hard foundation.