A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Capacity of Micropiles Embedded in Dolomite
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. Due to the relatively high compressibility, the allowable axial loads of fullscale micropiles, installed in the same manner as described herein and founded on competent rock, are determined more rationally from allowable deformation considerations, rather than code specified allowable stresses in the pile.
Evaluation of Capacity of Micropiles Embedded in Dolomite
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. Due to the relatively high compressibility, the allowable axial loads of fullscale micropiles, installed in the same manner as described herein and founded on competent rock, are determined more rationally from allowable deformation considerations, rather than code specified allowable stresses in the pile.
Evaluation of Capacity of Micropiles Embedded in Dolomite
R. J. Finno (author)
2002
79 pages
Report
No indication
English
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