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