Abstract
Axial load tests were conducted on four micropiles installed from the floor of a quarry southwest of Chicago. The micropiles consisted of 178 mm diameter steel drill casing with a wall thickness of 13 mm. The piles were drilled into dolomite with sockets that varied in length from 0.3 to 2 m, were tremie filled, and then grouted with pressures of about 140 kPa. The tests were conducted on piles instrumented with strain gages to determine axial load distributions and load transfer characteristics. The non-linearity of the response of the composite pile was considered when determining the axial load distribution in the piles. Results of the tests suggest the current practice based on structural considerations can be quite conservative, if the rock is competent. Load transfer through side friction is governed by the interface shear strength between the steel casing and the surrounding grout.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1038-1053 |
| Number of pages | 16 |
| Journal | Geotechnical Special Publication |
| Issue number | 116 II |
| DOIs | |
| State | Published - 2002 |
| Event | Deep Foundations Congress 2002 - International Perspective on Theory, Design, Construction, and Performance_ - Orlando, FL, United States Duration: Feb 14 2002 → Feb 16 2002 |
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Building and Construction
- Civil and Structural Engineering
- Architecture