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Unformatted text preview: 60 ~ 2900 kPa for qt in kPa where N 60 = the average SPT blow count (corrected to 60% energy) for a depth of 2 Bb below the toe (~ 50 blows per foot) if 8 > 50" (1.2 m) requires settlement of about 2.5" (60 mm) at ultimate . 50" h B" h reduce qt If need less settlement: %r =-qt were b In inC es B b 1.2m h B' qtr =----s-qt were b In m b o Rock o special topic, consider rock type, jointing, core recoveries, qu RQD = rock quality designation =[r.(L>4")]/length of run o conservatively use Terzaghi bearing capacity equation (typically lProck > 45 deg, and ~ cohesion very high)...
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- Fall '08