Abstract
Micropiles have been installed on many projects in many parts of the world for different purposes like underpinning, seismic retrofitting, slope stabilization, resisting uplift dynamic loads. However information on the behaviour of micropiles when subjected to vertical and oblique pull is rather limited in literature. A model testing programme was designed and carried out to investigate behaviour of micropile groups under vertical and oblique pull out loads. Micropile groups having different length to diameter ratio and different spacings were grouted in sand having a relative density of 50 %. The groups were subjected to 0°, 30°, 60° and 90° pull. Ultimate pull out loads and efficiency were found to be a function of length to diameter ratio of the piles and angle of inclination of the pull out loads. Groups subjected to vertical pull failed by soil failure and groups subjected to oblique pull failed by structural failure.
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