Cantilever Retaining wall is a reinforced cement concrete (RCC) Structure that is used to retain and hold back loose soil and gravel behind where there are abrupt changes in slope beyond their natural and stable angle of repose.
in external stability we try to make cantilever wall resist the overturning, sliding and settlement while in internal stability we try to make it resist the shear and bending moment. Usually in cantilever retaining wall only flexural and temperature or shrinkage reinforcement is provided and shear reinforcement is not provided as it would cause steel congestion, thus when there is requirement of shear reinforcement the area of concrete is increased.
In this post i will be sharing with you a pdf document containing the complete design example of a cantilever retaining wall.
The usual steps involved are as follows;
(i) Determination of preliminary dimensions of cantilever wall
(ii) checking external stability
(a) F.O.S against overturning
(b) F.O.S against soil pressure or settlement
(c) F.O.S against sliding and determining whether key is needed or not
(iii) Design of Heel Cantilever for shear and flexural
(iv) Design of Toe Slab for shear and flexural
(v) Reinforcement of Stem
(vi) Determining the cut length for reinforcement in stem by the help of graph
(vii) Checking the ACI conditions
(viii) Temperature and Shrinkage reinforcement
(ix) Final Presenting the results
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| Complete Design of Cantilever Retaining Wall |
Design Criteria
As far as the stability of a retaining wall is concerned; it is of two types (i) external stability and (ii) Internal Stabilityin external stability we try to make cantilever wall resist the overturning, sliding and settlement while in internal stability we try to make it resist the shear and bending moment. Usually in cantilever retaining wall only flexural and temperature or shrinkage reinforcement is provided and shear reinforcement is not provided as it would cause steel congestion, thus when there is requirement of shear reinforcement the area of concrete is increased.
In this post i will be sharing with you a pdf document containing the complete design example of a cantilever retaining wall.
Steps
The usual steps involved are as follows;
(i) Determination of preliminary dimensions of cantilever wall
(ii) checking external stability
(a) F.O.S against overturning
(b) F.O.S against soil pressure or settlement
(c) F.O.S against sliding and determining whether key is needed or not
(iii) Design of Heel Cantilever for shear and flexural
(iv) Design of Toe Slab for shear and flexural
(v) Reinforcement of Stem
(vi) Determining the cut length for reinforcement in stem by the help of graph
(vii) Checking the ACI conditions
(viii) Temperature and Shrinkage reinforcement
(ix) Final Presenting the results
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