00771070

Component

https://doi.org/10.3141/1663-01

http://scholar.google.com...nway&publication_year=1999

As part of the I-15 Corridor Reconstruction Project through downtown Salt Lake City, nine sets of full-scale load tests were performed at locations selected as representative of the subsurface conditions along the corridor alignment. Static compression, uplift, and lateral load tests were conducted at each test site location. The test program included dynamic monitoring of pile installation and restrike events using high-strain testing and analysis methods. Dynamic test results from restrike events on companion piles compared well with the measured static axial compression load test capacities. Subsurface conditions along the alignment range from deep clays to dense alluvial sands above the groundwater table. The piles derive their support from shaft friction or a combination of shaft friction and endbearing, depending on the strata present. The test and subsequent production piles are consistently indicating large capacity gains with time (setup), regardless of the subsurface conditions. The setup in the soft to stiff lakebed clays is attributed to remolding of the clays during the pile driving and subsequent reconsolidation. The setup in the dense sands in comparable with setup described by others in dense marine sands. Relationships were developed to predict long-term pile capacity based on dynamic test results from the end of installation and on data from the beginning of restrike. These relationships are being used during production pile installation and restrike events as an integral part of pile evaluation, troubleshooting, and quality control/quality assurance acceptance procedures.

This paper appears in Transportation Research Record No. 1663, Pile Setup, Pile Load Tests, and Sheet Piles.

English

p. 1-7

1999

Transportation Research Record

0309070597

Figures (5) ; References (5) ; Tables (4)

Alluvium; Bearing capacity; Clay; Dynamic tests; Interstate highways; Load tests; Monitoring; Pile driving; Pile foundations; Quality assurance; Quality control; Reconstruction; Sand; Urban areas

Pile setup

Salt Lake City (Utah)

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB, ATRI

Oct 1 1999 12:00AM

• CHARACTERIZATION OF PILE CAPACITY WITH TIME IN THE COOPER MARL: STUDY OF APPLICABILITY OF A PAST APPROACH TO PREDICT LONG-TERM PILE CAPACITY
• FINITE ELEMENT-BASED SEEPAGE DESIGN CHARTS FOR SHEET PILES PENETRATING HETEROGENEOUS MEDIA
• MEASURED TIME EFFECTS FOR AXIAL CAPACITY OF DRIVEN PILING
• NORTH CAROLINA DEPARTMENT OF TRANSPORTATION EXPERIENCE WITH PREDESIGN LOAD TESTING
• NUMERICAL PROCEDURE FOR PREDICTING PILE CAPACITY--SETUP/FREEZE
• PREDICTION OF PILE SETUP IN CLAY
• TENSION PILES IN SAND: A METHOD INCLUDING DEGRADATION OF SHAFT FRICTION DURING PILE DRIVING
• VALUE OF METHODS FOR PREDICTING AXIAL PILE CAPACITY