Lecture 3-Active Lateral Earth Pressure.ppt

active lateral earth pressure

1. Jl. A.Yani Pabelan, Kartasura, Surakarta – Indonesia 57162
Telp.: [phone], Fax. [phone]
Website: www.ums.ac.id, email: [email protected]
ACTIVE LATERAL EARTH
PRESSURE

2. ACTIVE LAERAL EARTH PRESSURE
Plastic equilibrium in soil refers to the condition where every point in a soil
mass is on the verge of failure.
If wall AB is allowed to move away from the soil mass gradually,
horizontal stress will decrease.
This is represented by Mohr’s circle in the subsequent slide.

3. RANKINE THEORY

4. ASSUMPTIONS
1.Wall and soil are frictionless
2.Wall is vertical 90°.
3.Type of failure is shear failure
4.Lateral pressure is linier to the depth.

5. When wall moves from
A to A’, effective
horizontal pressure
will decrease with a
consant effective
ertical pressure
•The active failure
occurs as the Mohr
circle gets the
failure envelopek

6. f,
kan

8. DIAGRAM OF ACTIVE PRESSURE
For dry cohesionless Backfill
??????
?????? = ??????
??????. ????????????
(c = 0)
??????
?????? = ??????
??????. ????????????
Gaya total Pa
adalah :
1
2
??????
??????
??????=?????? .
????????????
2

9. • cohesionless backfill
•Ground water level
•Surcharged load

11.  
aa
aaa
aa
a
H
a
H
a
H
a
KcKH
KcHKHK
KcHKH
dzKcdzzK
dzP





2
2
00
0
2
1
2
2
1
2
2
1
2




• cohesive backfill

12. - =
H
z
c
K
a

v






 





 






 







 








 





 

2
45tan2
2
45tan
2
45tan
2
2
45tan
2
45tan2
2
45tan
2
2
2
c
c
c
va
v
a
av





 

2
45tan
2
aK
aava KcK2





 

2
45tan
aK

13. ?

14. TEKANAN TANAH AKTIF, RANKINE
cwZ
H-Z
c
R
Pa1
Pa2
Pa
 


















 


Pa
Zc
ZcHPa
ZcH
Pa
R
33
21
3
ZcH
 
3
Zc
ZcH 

15. Te r i m a k a s i h