1. Session 13 – 14 SHEET PILE STRUCTURES
Course : S0484/Foundation Engineering
Year : 2007
Version : 1/0
Session 13 – 14 SHEET PILE STRUCTURES

2. Lateral Pressure Diagram Cantilever Sheet Pile
SHEET PILE STRUCTURES
Topic:
General
Types of Sheet Pile
Lateral Pressure Diagram
Cantilever Sheet Pile

3. SHEET PILE

4. GENERAL
Connected or semi-connected sheet piles are often used to build continuous walls to retain the lateral pressure caused by soil or external load.
In contrast to the construction of other types of retaining wall, the building of sheet pile walls do not usually require dewatering the site.
Sheet piles are also used for some temporary structures, such as braced cut.

5. SHEET PILE TYPES
CANTILEVER SHEET PILE

6. SHEET PILE TYPES
ANCHORED SHEET PILE
Free Earth Support

7. SHEET PILE TYPES
ANCHORED SHEET PILE
Fixed Earth Support

8. SHEET PILE TYPES
ANCHORED SHEET PILE
anchor plate or beam

9. tie back vertical anchor pile
SHEET PILE TYPES
ANCHORED SHEET PILE
tie back
vertical anchor pile

10. anchor beam with batter piles
SHEET PILE TYPES
ANCHORED SHEET PILE
anchor beam with batter piles

11. LATERAL EARTH PRESSURE DIAGRAM

12. LATERAL EARTH PRESSURE DIAGRAM

13. LATERAL EARTH PRESSURE DIAGRAM
Fixed Earth Support

14. LATERAL EARTH PRESSURE DIAGRAM
Free Earth Support

15. LATERAL EARTH PRESSURE DIAGRAM
Free Earth Support

16. CALCULATION STEPS CANTILEVER SHEET PILE - SAND

17. CALCULATION STEPS CANTILEVER SHEET PILE - SAND
1. Determine the value of Ka and Kp
2. Calculate p1and p2 with L1 and L2 are known
3. Calculate L3
4. Calculate the resultant of the area ACDE (P)
5. Determine the z (the center of pressure for the area ACDE)

18. CALCULATION STEPS CANTILEVER SHEET PILE - SAND
6. Calculate p5
7. Calculate A1, A2, A3, A4

19. CALCULATION STEPS CANTILEVER SHEET PILE - SAND
8. Determine L4
9. Calculate p4
10. Calculate p3
11. Calculate L5
12. Draw the pressure distribution diagram
13. Obtain the theoretical depth ; D = L3 + L4
The actual depth of penetration is increased by about 20% - 30%
14. Calculate the maximum bending moment

20. EXAMPLE CANTILEVER SHEET PILE - SAND
L1 = 2 m
L2 = 3 m
GWL
d = 15.9 kN/m3
t = kN/m3
= 32o
c = 0 kPa D
Determine the penetration depth (D) and dimension of sheet pile

21. EXAMPLE CANTILEVER SHEET PILE - SAND
Step 1 (determine the value of ka and kp)
Step 2 (calculate p1 and p2)
Step 3 (Calculate L3)
kPa
kPa m

22. EXAMPLE CANTILEVER SHEET PILE - SAND
Step 4 (calculate P)
Step 5 (calculate z)
Step 6 (calculate p5)
kN/m m
kN/m2

23. EXAMPLE CANTILEVER SHEET PILE - SAND
Step 7 (calculate A1 – A4)

24. EXAMPLE CANTILEVER SHEET PILE - SAND
Step 8 (determine L4)
Step 9 (calculate p4)
Step 10 (calculate p3)
L4  4.8 m
kPa
kPa

25. EXAMPLE CANTILEVER SHEET PILE - SAND
Step 11 (Calculate L5)
Step 12
Draw the pressure distribution diagram
Step 13 (the penetration dept of sheet pile)
Theoretical = = 5.46 m
Actual = 1.3 (L3+L4) =7.1 m m

26. EXAMPLE CANTILEVER SHEET PILE - SAND

27. EXAMPLE CANTILEVER SHEET PILE - SAND
Dimension of Sheet Pile m
kN.m

28. CALCULATION STEPS CANTILEVER SHEET PILE - CLAY

29. CALCULATION STEPS CANTILEVER SHEET PILE - CLAY
1. Determine the value of Ka and Kp
In case of saturated soft clay with internal friction angle () = 0, we got
Ka = Kp = 1
2. Calculate p1and p2 with L1 and L2 are known
3. Calculate the resultant of the area ACDE (P1) and z1 (the center of pressure for the area ACDE)

30. CALCULATION STEPS CANTILEVER SHEET PILE - CLAY
4. Calculate the theoretical penetration depth of sheet pile (D)
5. Calculate L4
6. Calculate p6 and p7
7. Obtain the actual penetration depth of sheet pile
Dactual = (1.4 – 1.6) x Dtheoretical

31. CALCULATION STEPS CANTILEVER SHEET PILE - CLAY
8. Calculate the maximum bending moment

32. EXAMPLE CANTILEVER SHEET PILE - CLAY
L1 = 2 m
L2 = 3 m
sand
GWL
d = 15.9 kN/m3
t = kN/m3
= 32o
c = 0 kPa
Clay D
cu = 47 kPa
 = 0 o
Determine the penetration depth (D) and dimension of sheet pile

33. EXAMPLE CANTILEVER SHEET PILE - CLAY
Step 1 (Determine ka and kp)
Step 2 (calculate p1 and p2)
Step 3 (calculate P1 and z1)
kPa
kPa
kN/m m

34. EXAMPLE CANTILEVER SHEET PILE - CLAY
Step 4 (obtain Dtheoretical)
Step 5 (calculate L4)
D = 2.13 m
L4 = 2.13 m

35. EXAMPLE CANTILEVER SHEET PILE - CLAY
Step 6 (calculate p6 and p7)
Step 7 (draw the lateral diagram)
Step 8 (Obtain Dactual)
kN/m2
Dactual = 1.5 x Dtheorical = 1.5 x 2.13 = 3.2 m

36. EXAMPLE CANTILEVER SHEET PILE - CLAY
Calculation of moment