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

Some understanding material! H <CsB  
?]%JQ]Gf*  
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. xsK{nM6g  
:T~Aa(%(  
This material may help a little bit! \8\)5#?  
qGMM3a)Q  

楼主的资料解析得很详细。 twgU ru  
!&Q,]\j  
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 ! 8l='Hl  
kOtC(\]5  
WO)K*c1F  
These conclusions are important ,I think. #ml
lVQ  
a'T|p)N.;T  
3.1 Values of E' f2{4Y)  
hJd#Gc~*M  
Typical values may be selected from the following values: $ng\qJ"HF  
H[>_LYZ8  

a3O_8GU  
Soft normally-consolidated clays              ( 1400  -  4200 kPa) h+Q==  
i(c2NPbX  
Medium clays                        ( 4200  -  8400 kPa) m%Ef]({I  
tkuN$Jl  
Stiff clays                        ( 8400  - 20000 kPa) u|QfCwQ  
@F,HyCSN  
Loose normally-consolidated sands            ( 7000  - 20000 kPa) M/1Q/;0P  
(9cIU2e  
Medium normally-consolidated sands        (20000  - 40000 kPa) m2_&rjGz  
4yBe(&N-d  
Dense normally-consolidated sands            (40000  - 84000 kPa) Qy6Avw/$  
pM#:OlqC  
W1:o2 C7  
For over-consolidated sands, double the above values. e9%6+9Y  
K/%aoTO}  
3.2 Values of v' {Or|] 0  
"%.#/!RG  
Soft clay        0.35 - 0.45 w:um
r#  
P
%/+?(?  
Medium clay        0.30 - 0.35 DJ<c  
"\>3mVOb  
Stiff Clay        0.2 - 0.3 sL\|y38'  
cA/2,i  
Medium sand        0.3 - 0.35 o1n c.2/0J  
5mFi)0={y  
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? /NkZ;<uxJ  
Iy,)>V%iZV  
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? KGI]W|T  
6C3y+@9  
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...  o j^U  
may i know the relationship between the "v" value and the soil displacemnt? P#0_  
},"g*  
thank. 1";~"p2(  

 

The soil displacement is mainly based on the soil stiffness (Young's Modulus E), drainage condition and stress distribution. OBZ|W**N"  
F>M$|Sc2  
For Clay, the poisson's ratio varies from 0.4 to 0.2 (soft clay to stiff clay), meanwhile the stiffness(E) from 1-15MPa  to 30-100MPa. The poisson's ratio decrease with stiffness increase, the dispalcement will be smaller with the same stress level; y>OZ<!`  
vW_A.iI"e  
For sand, the poisson's ratio varies from 0.15 to 0.35 (loose sand to dense sand), the E from 10-20 MPa to 40-80 MPa, obviously, the settlement is bigger in loose sand with smaller poisson's ratio. JC#@sJ4az)  
.xx#>Y-\  
All these are based on drained condition. Of course the displacement is affect by many other issues. 0L1P'*LRU  
oaKf{$vg  
Hope some help! ;L[9[uQ[C  
NqWHR~&  

引用第8楼daniellb1023于2007-08-31 15:43发表的  : dbLX}>  
THANKS Friend... UqHOS{\Sz  
may i know the relationship between the "v" value and the soil displacemnt?
thank. qYh,No5\;t  
[表情]

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

[vi4,'wm  
w(U/(C7R  
Q.XsY.{  
I know D. Muir Wood (critical state book) tells sth relevant. But Mano's materials is a very detailed analysis with examples.