The Islamic university - Gaza

1. The Islamic university - Gaza Faculty of Engineering Civil Engineering Department Principles of foundation Engineering Chapter 7 Lateral earth pressure Engr. Safaa Abu El-Aish

2. Types of lateral earth pressure: • At rest soil pressure: • Active soil pressure: • Passive soil pressure:

3. At rest soil pressure: At any distance (z) below the ground surface, the lateral earth pressure ( ) equals: : At rest pressure coefficient, For normally consolidated If there is water table we have to add the effect of water pressure to the lateral pressure: The coefficient of lateral earth pressure for the water =1 for any case. To find the at rest forces:

4. The water stress diagram is a triangle starts from (0.00) to the value of

6. Rankin Active soil pressure:

7. Ranking passive soil pressure:

8. Note: For retaining wall design, the active soil pressure is assumed as follow (Modified Active soil pressure)

9. EXAMPLE 1:

11. Example) A 3m length wall as shown below, Determine the ranking passive soil pressure per unit length of the wall.

13. Rankin soil pressure for inclined backfill: Active: Passive:

14. Active: Passive:

15. THE END