Thanks,
`Z#':0Z L&rtN@5; Some points you may concern:
cv1PiIl '?
-N 1) M-C model, undrained condition, effective stress analysis:
y\4/M6 In this case, the plasticity can be predicted as usual;
>|`1aCg, BR-wL3x
b 2)M-C model, undrained condition, total stress analysis:
"',;pGg|K =HB(N|9 _d In this case, there is not effective stress calculation due to no pore pressure generated.
WJ)4rQ$o 15En$6> The total stress analysis plasticity occurs as soon as the total stresses reach the failure
W'=}2Y$]u +sTPTCLE criterium while with an effective stresses analysis plasticity occurs when the effective stresses
u.G aMl4 ( j6};K ~N` reach the failure criterium.
`>b,'u6F \rATmjsKzS The latter is of course more realistic; only the effective stresses determine plasticity, not the water pressures.
v,8Q9<=O T@`Al(' In other words, using total stress analysis is only correct when the calculation is elastic. But this case is not very often in reality.
19-V;F@; xX9snSGz 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 ]