DESIGN OF CANTILEVER RETAINING WALL PER ACI318-05

Material

Concrete grade 

Steel grade

Material factor

Conrete density

Soil density

Angle of repose for soil

Coefficient of active earth pressure ka =

Coefficient of passive earth pressure ka =

Safe Bearing Capacity

Coeff of friction for Sliding

Loading

Surcharge pressure

F.S against Overturning

F.S against Sliding

Max. bearing pressure

Wall Main reinforcement

Heel Top Main reinforcement

Toe bottom main reinforcement

Design Output

Stability Calculation

Check for Overturning

Check for Sliding

Total Horizontal force

Restoring force =

Factor Safety

Check for Bearing pressure

C.g of Load

eccentricity

fbmax

fbmin

Structural Design

Design of Stem (vertical reinforcement - inner face-(1))

Thickness at bottom of the stem

Diametre of the bar used

Clear cover to the main bar

Effective depth

Moment at root of the stem =

Design moment Mu = 1.6.M

Rmz

Check for shear

Total shear at root

Design shear stress

All. shear stress

 Wall vertical reinforcement - Outer face (2)

Diametre of the bar used

Average eff depth

Min % steel 

Area of steel reqd 

Spacing of 16 dia bar

Design of Heel Slab( Top reinforcement-(3))

Thickness at base slab

Diametre of the bar used

Clear cover to the main bar

Effective depth

Calculation of net pressure in the heel slab

Check for shear

Total shear at  face of wall

Design shear stress

All. shear stress

c) Design of Toe Slab( Bottom reinforcement (4))

Thickness at base slab

Diametre of the bar used

Clear cover to the main bar

Effective depth

Calculation of net pressure in the toe slab

Check for shear

Shear at  d from face of wall

Design shear stress

All. shear stress

horizontal reinforcement

Wall(5)

Average thickness of Wall

Min % steel required for shrinkage & temperature

Ast reqd for whole section =

Above steel shall be distributed in both the faces

Dia of bars used

Spacing of bars 

Base Slab(6)

Average thickness of Wall

Min % steel required for shrinkage & temperature

Ast reqd for whole section =

Above steel shall be distributed in both the faces

Dia of bars used

Spacing of bars 

d) Design of Shear Key

Considering a factor of safety against sliding 1.5.

Horizontal force reqd. to resist sliding

Restoring force available

Force to be resisted by the key

Assumption

i) Shear key is exactly placed below the stem/wall

ii) 2/3rd of SBC on the soil to resist the shear

Allowable passive pressure

Hence depth of the key

Moment @ the bott. Face of slab

Thickness of the shear key assumed

Diametre of the bar used

Clear cover to the maib bar

Effective depth

Design moment = 1.6.M

Structural Details of Retaining Wall

Calculation Reference

Concrete Design

Beam Design

Retaining Wall