36_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

36_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - 'P...

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p19 NC Settlement Example 1: Find Pc under center of mat foundation Solution: calculate pc for the clay layer. Use point P at mid-height of layer to represent stress change in layer. (Pc in sand = 0) Initial Stresses: Sand Ym = 15.7 kNlm' Y,ot = 19.1 kN/m' '¥water = 9.81 kN/m 3 NC Clay (OCR = 1) ,"I = 18.6 kNlm' Cc = 0.28, eo = 0.90 Stress Change: the soil is excavated Of (= 2m) prior to footing placement q et-applied 10acb;:(0It) - ~ YJlll ~ [100 "IN ('<'0<) /.N NN)/{!./} ... , Y 'lb''')) - '} ..... (IS. 1 trJ/ ••. ,~J 20 m :: 1., g. ~ I<N/~- 15 m ~ use Boussinesq "rnn chart" for stress change ~ - - - 30 m chart gives ;'crv under corner of footing so use superposition at P 'P , 40m 1"1· If"1("·"'I,,+·l~.):
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Unformatted text preview: 'P , 40m 1"1· If"1("·"'I,,+·l~.): o.~3 }:[: 0.1 •• .n-: ?o,,· / ( j..,,,, '1", I 1",,) ~ 1./1 /.16"v ' "/11: , "Ii '-'r·, L~/",) (D,Il!), 1'1 f'. 2 .r!.,' pc = ( CcH ) 10{O' vo +,tJ.o v) Consolidation: 1+8 avo = (""it,.~)) (, (,v~.", 1'/'-,) : .20 2~, = 202 M,,,\ J ' 0.'10 j '2{)</·1 ~ Note: we should also check under corner of footing for comparison P\'; 10 ",j( z '"' I)", )".) , I. b" (, _ 5 ~'[)·;1. .~1. ,,~ t/ O l'l! (2,.,) 'J"d 3,,), ?l't ~~-)( " . ?r ' hi! .• 'N;',,' L, ,n): 5'0. ~ kN/" , /0':; (~)_ 1. 1. 'l . (), D 11." _...
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