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27_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

# 27_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - p10...

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p10 4. Plot dial gage readings R vs. log time for each load and fit a smooth curve for analysis. Calculate C v and C a using the Casagrande construction: c V -.: R o Rso -_.J--"---a ____ :":::a 1 1 1 1 1 1 1 1 ---'--~---- --- 1 1 1 1 1 1 1 I - - _I- - -1- - - - "1- -:':-"-~~----b-.«:::..: 1 1 1 log time, t T5~ (~/,J) "l/{su -: O./~~ ( fI/l) 2/i~d (rJ: 1.. (7)1 Jo .... t 1a Jf .... ~"e.) C a = -Ae 1 log (4/13) a) Find R o : choose t1, calculate 12 = t1/4, measure vertical distance "a" on curve from t1 to t2, R o is distance 2a above Rat t1 b) Find R 100 at "intersection" of primary and secondary consolidation c) Find Rso by taking average of R o and R 100 d) Calculate C v as shown above using time factor Tso e) Calculate C a : Calculate e for times hand 4 along secondary compression part of curve as shown above 5. Plot dial gage reading R vs. square root time
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