SPT - CPT Presentation

SPT - CPT Presentation - In situ Testing CPT SPT CPT SPT...

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1/7/2009 1 In situ Testing CPT & SPT Jason DeJong www.sil.ucdavis.edu ECI 173 Variety of In Situ Devices Available (NHI 2002)
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1/7/2009 2 Range of Applicability d SPT CLAYS SILTS SANDS GRAVELS Cobbles/ Boulders n-Situ Test Metho CPT DMT PMT 0.0001 0.001 0.01 0.1 1 10 100 1000 Grain Size (mm) I VST Geophysics (NHI 2002) Very common test worldwide 1902 Colonel Gow of Raymond Pile Co. Standard Penetration Test (SPT) Split barrel sample driven in borehole Conducted on 5 ft depth intervals (1.5 m). ASTM D 1586 guidelines Drop Hammer (140 lbs falling 30 inches) (63.5 kg hammer falling 0.76 meters) Three increments of 150 mm each; Sum last two increments = "N value" (blows/ft) (NHI 2002)
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1/7/2009 3 Standard Penetration Test (SPT) (NHI 2002) Standard Penetration Test (SPT) Obtain Sample + Number Obtain Sample + Number Advantages Disadvantages Simple & rugged device at low cost Suitable in many soil types Can perform in weak rocks Available throughout the US (worldwide Disturbed sample (index tests only)
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This note was uploaded on 03/24/2011 for the course ECI 173 taught by Professor Dejong during the Spring '11 term at UC Davis.

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SPT - CPT Presentation - In situ Testing CPT SPT CPT SPT...

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