Class notes
SGM 311 T3 Effective Stress Notes 2020
- Institution
- University Of Pretoria (UP)
Notes include my own handwritten notes as well as notes written on the PDFs given. All notes are written on an iPad (they are digital).
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TEEEEEFivEmStressors
, P
σ=
A
Σ F z =0
,
u u P = N + uA
u
,
u P ΣN
= +u
A A
u
,
σ = σ +u
Where:
σ = total stress not same
contact
as
stress
can't measure effective
g- , f
stress in 80M σ = effective stress
30T can measure 0 (w total stress cell )
then : O
'
if
= O
U
-
Lw
u
piesaueter) u = pore water pressure 2
, tEF-EEEE-HESTRES.SN
Cha per 3
✗ Focus on
fully saturated soil
0=_
If
"
"°
above ""
yyertical
on
soil ""
weight +0M ""
→
force ""
external I applies retain
""'s
internal
dam)
=
EFZ 0 '
go.naan.am
=
# contact forces
,
vertical forces embankment
EN
UA water force
'
←
P = EN + UA
external
P=n =
EAI + u
stress
totalcell
cut
element
i
→
-
,
'
I or = O + u o =
total stress
waueg,
not straight '
1 effective
o stress
t -_
to never cut through soil soiid
""
a P" ↳ only cut through contact
surface
U =
pore water pressure
remove
in the internal i
↳ otherwise to include
y bring
have ,
effects stresses of soil particle
, forces) insert
I pieisonreter
* How are stresses distributed
Mag of forces
so that system the static eqllb ↳
Quantifying the internal stresses draw FBD
* interested in vertical component (to keep vertical eqllb W external forces)
•
water pressure in all voids are equal
↳ ie . contribution of water pressure →
force
④ The behavior of soil →
depends on the effective stress
, Van Zyl Spruit Bridge
Total stress cell
3
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