Group Efficiencies of Grout-Tipped Drilled Shafts and Jet-Grouted Piles

McVay, Michael; Thiyyakkandi, Sudheesh; Joiner, James; Adams, Viktor; University of Florida. Dept. of Civil and Coastal Engineering

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Group Efficiencies of Grout-Tipped Drilled Shafts and Jet-Grouted Piles

2010-08-01
By McVay, Michael ; Thiyyakkandi, Sudheesh ; Joiner, James ; ...

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Creators:

McVay, Michael ; Thiyyakkandi, Sudheesh ; Joiner, James ; Adams, Viktor

McVay, Michael ; Thiyyakkandi, Sudheesh ; Joiner, James ; Adams, Viktor Less -
Corporate Creators:

University of Florida. Dept. of Civil and Coastal Engineering
Corporate Contributors:

Florida. Department of Transportation
Subject/TRT Terms:

[+]

Bearing Capacity Drilled Shafts Driven Piles Grouting Jet Grouting Piers (Supports) Pile Driving Pile Foundations Pile Groups Piles (Supports) Tip Grouting
Publication/ Report Number:

UF Project 73980/74027
Resource Type:

Research Paper
Geographical Coverage:

Florida
Corporate Publisher:

University of Florida. Department of Civil and Coastal Engineering
Abstract:

In current practice, driven piles/drilled shafts are constructed in a group at 3D center to center (c/c) spacing to minimize group interference (i.e., group efficiency factor ~ 1) as well as reduce the cost of the reinforced concrete cap. Presently, group efficiency factors for a number of new foundation types, e.g., post-grouted drilled shafts and jet-grouted piles, are unknown. This research looked into the group interaction of post-grouted drilled shafts and jet-grouted piles at typical 3D spacing. Two sets of group tests for grout-tipped drilled shafts and jet-grouted piles were performed in the Florida Department of Transportation (FDOT) test chamber in medium dense sands. The experimental top down group testing revealed that the jet-grouted piles behaved as a block at 3D spacing, whereas post-grouted drilled shafts acted independently of one another, i.e., no group interaction. A group interaction factor, as well as an analytical approach for predicting load versus displacement for single or group of jet-grouted piles, is suggested. In the case of the grout-tipped drilled shafts, the grout pressure always resulted in an upward flow of grout alongside the shaft which increased both the side and tip areas. The increased areas and grout tip preload were the three factors identified with the increased shaft and group resistance. Due to uncertainty in estimating areas, a conservative design approach for assessing single and group capacities of post-grouted drilled shafts at 5% displacement is proposed. Finally, the use of stage grouting to assess the increase in shaft capacity (skin and tip) is suggested.
Format:

PDF
Funding:

BDK-75-977-07
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:050d9f6eb887d26bb766e6eedd5bfb63b59d7654f40be03a3a45b4847483e587
Download URL:

https://rosap.ntl.bts.gov/view/dot/60446/dot_60446_DS1.pdf
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Group Efficiencies of Grout-Tipped Drilled Shafts and Jet-Grouted Piles

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