Thanks,
*1`q
x+1 m[8?d~ Some points you may concern:
(F=q/lK$ e.VR9O]G 1) M-C model, undrained condition, effective stress analysis:
g?OC-zw In this case, the plasticity can be predicted as usual;
=s/UF _JN X-k$6}D 2)M-C model, undrained condition, total stress analysis:
PSREQK@}E _?rL7oTv In this case, there is not effective stress calculation due to no pore pressure generated.
Tx:S{n7& ;%B:1Z The total stress analysis plasticity occurs as soon as the total stresses reach the failure
,%<ICusZ ly( LMr criterium while with an effective stresses analysis plasticity occurs when the effective stresses
M T]2n{e iOXsj reach the failure criterium.
%2,'x C7Ny-rj}IA The latter is of course more realistic; only the effective stresses determine plasticity, not the water pressures.
b`&
:` F~;UD<<"H In other words, using total stress analysis is only correct when the calculation is elastic. But this case is not very often in reality.
:sA$LNj} WWjc.A$ Suggestion: Try to use effective stress analysis when it is undrained condition (typically, there is option for this in PLAXIS).
[ 此贴被mano在2007-08-31 16:34重新编辑 ]