Abstract
Micropiles are drilled and grouted piles having diameter between 100 to 250 mm. Due to its small diameter, it is suitable for low headroom and limited work area conditions. It can be installed without noise nuisance, without vibrations to surrounding soils and structures and without disruption to the production operations in industries which makes micropiles suitable for underpinning and seismic retrofitting of structures. It is necessary to therefore understand the behaviour of micropiles under different loading conditions. This work is on vertical and battered micropiles with different length/diameter ratio (L/D) subjected to vertical and lateral loading conditions. Batter angles had a significant influence on both the vertical and lateral load carrying capacity. The ultimate vertical load was found to increase upto a 30° batter. The ultimate lateral load was found to increase significantly with increasing L/D ratios upto an L/D ratio of 30 for vertical and 48 for battered piles, beyond which the increase was found to be not significant. In general, negative battered micropiles offered more lateral resistance than positive battered micropiles. The results of the study indicated that the ultimate load capacity and mode of failure of the micropiles are a function of the angle of batter, direction of batter and the L/D ratio for vertically and laterally loaded micropiles.
Highlights
Micropiles have been in use for more than 50 years
The vertical micropiles (0 ̊ batter) with the respective length/diameter ratio (L/D) ratio were chosen for comparison of the behaviour of the battered micropiles
For battered micropiles subjected to vertical loads, the ultimate load carrying capacity of the micropiles was found to increase with increasing L/D ratio upto 30 ̊ batter
Summary
Micropiles have been in use for more than 50 years. They were conceived as innovative solutions to aid in difficult post war reconstruction efforts. These small elements allow engineers to solve some difficult structural support problems involving high loads and restricted access. Engineers and researchers are giving renewed attention to micropile networks as technically and economically viable solutions to problems of slope stabilization, lateral loading and seismic retrofit
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