70_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

70_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - X11...

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ROD (%) Rock Ouality 0-25 Very Poor 25-50 Poor 50-75 Fair 75-90 Good 90-100 Excellent X11 Rock Coring (rock = really hard parent soil) o Often desirable to penetrate rock to verify thickness and check competence. o Design properties are required for drilled shaft foundations in rock and footings bearing on rock. o Commonly obtain cores for unconfined compression and split tensile lab tests (similar to concrete) o. Soft rock may be tested using the SPT - quite common in FL limestone. Piles are often driven into soft rock. SPT correlations for bearing and side shear have been developed by the FOOT. o Pressuremeter and rock dilation tests are sometimes performed within core holes to determine stiffness, measure existing stresses, and estimate strength properties. R Length of Core Recovered 100° 1 o ecovery = x 10 Length of Core Run R k 0 I 'ty D' t' ROD I: Core Pieces with Length> 4 " 1 0001 o oc ua I eSlgna Ion = L h f C R x 10 engt a are un o High recovery and high ROD indicate sound rock. Recovery <
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This note was uploaded on 02/10/2012 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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