Cantilever retaining wall

Posted at civilineer

 

Points to be remember:-

1. It becomes uneconomical if height of retained earth goes beyond 8mtr.

2. Stem, heel and toe slab bend like cantilever.

3. Thickness of any slab should not be less than 150mm.

4. Stem is generally tapered with maximum thickness of bottom.

5. Main R/F of stem is provided on bank face.

6. Main R/F of heel and toe slab is on top and bottom respectively.

7. Critical section for bending of heel and toe slab are at back and front respectively.

8. Critical section for bending of stem is at the junction of base slab and stem.

9. Active earth pressure produces disturbing force and disturbing moment for sliding and overturning.

10. Disturbing Force =Pa=

11. Disturbing Moment=PaxH/3

12. Restoring moment is obtained by self weight of retaining wall and soil above heel slab.

                (Restoring moment=09w x Perpendicular distance between W and toe point.)

13. Restoring force for sliding is obtain from friction between base slab and soil below it. If friction is not sufficient than shear key is provided and placed in such a way that main R/F of stem can be extended inside the shear key for anchorage.

                             (Restoring force=Friction +Pp)