How to design a concrete cantilever retaining wall
In this exclusive construction video tutorial, the renowned engineer, Mr. Paral Pal, introduces you the procedure that can be applied to design a cantilever retaining wall for a road based on the following criteria :-
Height of stem = 5 m
The soil of the backfill is leveled
Unit weight of fill = 18 kN/m3
Angle of internal friction for fill material = 30 degree
Permissible S.B.C = 160 kN/m2
Coefficient of friction among concrete and ground = 0.40
M20 grade concrete and Fe415 steel is applied here.
Based on the above figure, the calculation is done.
Given below, some useful notes on Retaining Wall:-
Retaining walls belong to the structures which are built up to sustain the earth or other loose materials to make them stand vertically independently.
The retaining walls are also utilized to provide support to the grounds at various levels on both sides of wall.
The material sustained by the wall is known as backfill.
Based on the shape and the method of withstanding pressure because of backfill, the retaining wall is categorized as follow:-
- Gravity retaining wall
- Semi-gravity retaining wall
- Cantilever retaining wall
- Counterfort retaining wall
- Buttress wall
Cantilever Retaining Wall
This type of retaining wall is formed with reinforced cement concrete.
The wall comprises of a thin stem and a base slab cast monolithically.
Factor and considerations in designing retaining walls:-
Characteristics and type of soil
Height of water table
Subsoil water movements
Type of wall
Materials utilized in building up the wall
The following forces operate on a retaining wall:-
Pressure at rest
Active earth pressure
Passive earth pressure
Cantilever retaining walls are mostly applicable for residential purposes, frequently as integral basement walls. Generally, the cantilever wall stem is made of concrete block construction mounting from an in-situ concrete foundation.
Video Courtesy : parag pal