Pull-out Test Studies on the Interface Characteristics between Geogrids and Soils

 

Danda Shi

Associate Professor, Shanghai Maritime University, Shanghai, China
e-mail: ddshi@shmtu.edu.cn

Fei Wang

Shanghai Maritime University, Shanghai, China
e-mail: ernest822@hotmail.com

 

 ABSTRACT

Series of pull-out tests were performed to study the interface characteristics between geogrids and soils. Both uniaxial and biaxial geogrids were used to investigate the interaction properties with sand and clay. The function of geogrid reinforcement and the geogrid-soil interaction mechanism were mainly studied by experimental methods. The effects of soil density, vertical stress level and displacement rate on the geogrid-soil interaction characteristics were also discussed. It has been indicated that as to uniaxial geogrid reinforced in both sand and clay, the pull-out curves exhibit typical strain softening behavior. While as to biaxial geogrid conditions, the pull-out curves behave strain hardening. The reinforcement effect of biaxial geogrid is better than that of uniaxial geogrid due to distinct enchasing force developed between biaxial geogrid and soil particles. It has also been found that soil density, vertical stress level and displacement rate will influence the interface characteristics, but these effects are different when different types of geogrids and soils are considered.

Keywords: Geogrid; soil; interface characteristics; pull-out test

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