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Case History Evaluation of Axial Behavior of Micropiles  

Jeon Sang-Soo (Korea Highway & Transportation Technology, Korea Highway Corporation)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.7, 2004 , pp. 25-32 More about this Journal
Abstract
This paper examines the results of full-scale field tests on micropiles and side resistance is evaluated with respect to axial displacements and soil properties. Both cohesive and cohesionless soils are included in this evaluation. For all practical purposes, the developed load-displacement relationship and the geotechnical soil properties for each micropile and soil type can be used to represent the available data well through normalized average values and empirical correlations. There is a significant difference in load-carrying capacity between micropiles and drilled shafts that results primarily from the micropile pressure-grouting installation effects on the state of stress in the ground. The results show that micropiles can have a significant increase of capacity over larger-diameter drilled shafts at shallower depths with D/B < 100 or so. In cohesive soils, the typical increase is on the order of 1.5 with values as high as 2.5. For cohesionless soils, the typical increases are in the range of 1.5 to 2.5 with values as high as 6.
Keywords
Axial behavior; Empirical correlations; Full-scale field test; Micropiles; Soil properties;
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