[资料共享]Relationship between Young’s modulus and effective Young’s modulus [复制链接]

Some understanding material! 4CioVQdj  
8f-B-e?k  
When you use Undrained or Drained condition, total stress analysis, and effective analysis. You need consider what's the parameters will be input and how to calculate. YN5p@b=FX  
WJw %[_W  
This material may help a little bit! OeY+Yt0  
Z~ {[YsG  

楼主的资料解析得很详细。 yQkj4v{  
dA;f`Bi;Q  
上图是对不排水模量得理论推导，据此可以通过初始应力估算不排水模量

点击图片放大观看

Thank you for your sharing!

Thanks for mano's good material ! Eeemy*U  
FsrGI (x?  
:-xF=Y(;  
These conclusions are important ,I think. cC'{+j8-a  
h(aF>a\Z  
3.1 Values of E' (uBevU\  
!b<c*J?f  
Typical values may be selected from the following values: X(m&  
v#EXlpS  
Xj:?V;  
Soft normally-consolidated clays              ( 1400  -  4200 kPa) cnh\K.*}_x  
5Qb%g)jZ  
Medium clays                        ( 4200  -  8400 kPa) K*Tj;
  
E}S)uI,gn  
Stiff clays                        ( 8400  - 20000 kPa) I2JE@?  
!"\UT&  
Loose normally-consolidated sands            ( 7000  - 20000 kPa) F?]nPb|  
!|P>%bi
 
Medium normally-consolidated sands        (20000  - 40000 kPa) S:qML]RO  
[ Fid  
Dense normally-consolidated sands            (40000  - 84000 kPa) q5il9*)d(  
x%kS:!  
~
2Jvb[IM  
For over-consolidated sands, double the above values. 9o7E/wP  
B|#*I[4`w@  
3.2 Values of v' 2J;h}/!H  
`$|!h-"  
Soft clay        0.35 - 0.45 %a-:f)@  
;74hOHDS  
Medium clay        0.30 - 0.35 Vw7NLTE}`  
Snx_NH#tA  
Stiff Clay        0.2 - 0.3 {b4+ Yc  
31b9pi}nf  
Medium sand        0.3 - 0.35 /JPyADi  
$Bd{Y"P@6  
These typical values should be used with caution.  Soils are extremely variable materials and considerable expertise is needed to determine accurate parameters.

thanks ....may i know what is the reference book's name? aL@myq.  
(xffU%C^  
may i conclude that, the "v "value is related to soil parameter, and for good soil "v" value is smaller? and in Plaxis input, if the "v" value is smaller, the soil deformation is samller? |eIEqq.Eb  
:AYp{"{  
thanks

The miu value is not only related to the property of the soil, but also to the drainage condation. Usually, the effective parameter is smaller than undrained condition. The plaxis gives the example data.

THANKS Friend... ?qwTOi  
may i know the relationship between the "v" value and the soil displacemnt? gZ6]\l]J{  
mZsftby}  
thank. 3uO#/EbS  

 

The soil displacement is mainly based on the soil stiffness (Young's Modulus E), drainage condition and stress distribution. m~Q]#r  
"4N%I  
For Clay, the poisson's ratio varies from 0.4 to 0.2 (soft clay to stiff clay), meanwhile the stiffness(E) from 1-15MPa  to 30-100MPa. The poisson's ratio decrease with stiffness increase, the dispalcement will be smaller with the same stress level; kgfOH.P  
O<nJbsl_w  
For sand, the poisson's ratio varies from 0.15 to 0.35 (loose sand to dense sand), the E from 10-20 MPa to 40-80 MPa, obviously, the settlement is bigger in loose sand with smaller poisson's ratio. c]:sk[u  
#|'&%n|Z  
All these are based on drained condition. Of course the displacement is affect by many other issues.  5|2v6W!e  
yyZ}qnbx]  
Hope some help! WK5~"aw  
g7!P|  

引用第8楼daniellb1023于2007-08-31 15:43发表的  : F?=(4Pyvu  
THANKS Friend... 1.WdxMpW9  
may i know the relationship between the "v" value and the soil displacemnt?
thank. ;!U`GN,tH  
[表情]

引用第6楼daniellb1023于2007-08-31 14:30发表的  : .m_yx{FZ=  
thanks ....may i know what is the reference book's name?
thanks

5Gm,lNQAv  
envu}4wU=e  
|@pJ]  
I know D. Muir Wood (critical state book) tells sth relevant. But Mano's materials is a very detailed analysis with examples.