23_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

23_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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= C B 1- J12 x(C s rigid square,corner PI sq E C s flex square,corner = C' B 1- J.l2 x( C s flex circle,edge PI sq E C s flex circle,center C ' B 1- J.l2 (C s rigid square,center P = q X ---=:.-~-~---- I s E C s flex square, center p6 Approximate Solutions: Using various combinations of Tables P1, P2 and P3 can get "ballpark" estimate of immediate settlement for many cases not covered. Always start with ~_ closest initial approximation, then "correct" as necessary. Examples: 1. Rigid Rectangle, deep clay layer, find Pi under a corner (Case I: PI = CsqB 1_: 2 ) But Table P1 has no rigid rectangle, so use Cs for flexible rectangle and "correct" using rigid vs. flexible square Cs factors. =-_--oo::::::s:::: "correction factor" 2. Rigid circle, soil underlain by rock, find PI under center Start with Case II C's which is for a flexible circle. 0~: ... , "correction = C' B 1- J12 x( C s rigid circle,center factor" PI sq E C s flex circle,center 3. Flexible circle, clay underlain by rock. Pi under circumference (Le. edge)
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Unformatted text preview: Start with Case II C's which is under the center of a flexible circle.-"correction factor" 4.. Rigid rectangle, clay underlain by rock, Pi under center Start with Case II C's which is under the center of a flexible rectangle. "correction factor" ~5. ~. . If two soil layers underlain by rock, bracket the problem 1:~:<:::>::::::::::\\\L Step 1: Use.Case II, assume entire depth of 25' of all soft s~\.1 ../10' E 1 = 4x1 0 5 psf Step 2: Use Case II, assume entire depth of 25' of all strorJ)oil ~~,~ ~"'''''''''\»~''-'':-~'''';-\ (The actual settlement will be between these two values) 15' E2 = 7x1 0 5 psf Step 3: Use Case II with a weighted average for E and compare 'J with above limits: E = 10'(4xl0 5 psf) + 15'(7x~05psf) _ 58 lOS f ~ ~-.x ~...
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