18_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

18_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - p1...

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p1 SETILEMENT IN CLAY SUMMARY Strains due Surface Load: Surface loads cause a change in the stresses within the soil mass and induce two types of soil strain. ... z t 1----, ~Y'J- -- / ! / 'J [ ,.. I ,... I -( E z I i I I I , I I I I I I I I - - 7-~ ~~- .,.----.- Ey~ J.' ~ __ . ..... }'Yzx x Ex ~XY y~ Snrtl{' y z i a, t n t zy/ / 'txz y' I I 1/' ~ IL x /a 1" "(xy t y/ , 3-D soil element with & normal (a) & shear (t) stress Normal strain (E) due to normal stress Rotational strain (~) due to shear stress Linear Elastic, Homogeneous, Isotropic: E = Young's modulus. -f- Poisson's ratio, 1r = _E::!'""a,,,,e,,,,a,-' - (longitudinal Normal Strain, E 1 (a ~(a +0')) Volumetric Strain, E v = (Ex +E y +£z) x=E x- y , Shear Strain, 't xy 'Yxy =G E Shear Modulus, G = --=-- 2(1 + J.I.) Bulk Stress, Bulk Modulus, _(o-x +o-y +0-,) 0- 0 - 3 K=O"o= E E v 3(1- 2J.1.) Note that for Saturated Cia = O.5~ and K - ~ (water Is incompressible) Time Settlement: A clay layer under a surtace load may "settle" (strain) significantly. This settlement under load has three basic components.
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This note was uploaded on 02/10/2012 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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