Thanks,
l4RqQ+[KA; qK'mF#n0# Some points you may concern:
n~0wq(8M `O7vPE 1) M-C model, undrained condition, effective stress analysis:
V_
6K ?~j In this case, the plasticity can be predicted as usual;
4<s;xSCL <);j5)/ 2)M-C model, undrained condition, total stress analysis:
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'568 S:!5|o| In this case, there is not effective stress calculation due to no pore pressure generated.
OG#^d5( E zcch1 The total stress analysis plasticity occurs as soon as the total stresses reach the failure
7Ydqg& i<S\x criterium while with an effective stresses analysis plasticity occurs when the effective stresses
Dml?.-Uv< kgBkwp reach the failure criterium.
U,b80%k: 1<9d[N* The latter is of course more realistic; only the effective stresses determine plasticity, not the water pressures.
3~`\FuHHe l4kqz.Z-g In other words, using total stress analysis is only correct when the calculation is elastic. But this case is not very often in reality.
.;?ha' 4"PA7
e 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 ]