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151_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

151_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - o...

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DF30 o Osterberg Cell (Q-cell) Tests (www.loadtest.com) '- 0 developed by Dr. Jorg Osterberg from Northwestern University o cast single-use jack in the pile (cast in-place, not recovered, plan in advance) o measures end bearing and side shear separately from pile bottom (bi-directional) o combine bearing and shear load curves to get equivalent top load o cells manufactured by American Equipment & Fabricating Corp. o most tests done by local company Loadtest, Inc. (now international) o 5-34" diameter cells, 170-6,150 kip capacity o limited by lesser of end bearing or side shear (one fails first - no more reaction)
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Unformatted text preview: o multiple cells at same level, multiple levels in same pile o cheaper than top load tests, especially above 2,000 kips o world record test In Blountstown, FL (1997) - S.R. 20 bridge over Apalachicola River, 9 ft (2.75 m) diameter drilled shaft, 127 ft deep, 15,000 ton (135 MN) equivalent top load test (end bearing + side shear)-4 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Load (MN) Osterberg eel/load-movement curves, world record load test (2.75m diameter shaft embedded in limestone)...
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