Irrigation DesignAid
Retaining Wall Design
Input Parameters
Wall Height (H)
Wall Height (mm)
Top Width (T
w
)
Top Width (mm)
Top PCC Thickness (T
t
)
Top PCC Thickness (mm)
Base PCC Thickness (B
t
)
Base PCC Thickness (mm)
Toe Width (W
t
)
Toe Width (mm)
Heel Width (W
h
)
Heel Width (mm)
Side Slope (H)
Example: 1
Side Slope (V)
Example: 1.5
BackFill Soil Properties
Angle of Friction (Phi)
Angle of Friction
Allowable Bearing Pressure
Allowable Brearing Capacity
Dry
Dry Unit Weight
Saturated
Saturated Unit Weight
Submerged
Submerged Unit Weight
Water Table Height
Water Table Height from base (mm)
Surcharge Load
Surcharge Load
Unit Weight Material
Unit weight of wall material
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Calculated Results
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Reference Data
Materials Wt.
Soil Parameter
Bearing Pressure
Weights of Materials
Material
Weight (KN/m
3
)
Water
9.8
Stone masonry
21
Brick masonry
21
Mass concrete
24
Reinforced concrete
25
Steel
78.5
Timber (Saal)
8
Timber (Teak)
6
Dry backfill
16
Saturated backfill
20
Submerged backfill
10.2
Dry, compacted backfill
18.5
Saturated compacted backfill
21.5
Submerged compacted backfill
11.7
Gabions
14
Traffic Surcharge Hills
2
Traffic Surcharge Terai
10
Typical Soil Parameter
Soil Type
Angle of Internal Friction (degree)
Gravel
40 - 55
Sandy gravel
35 - 50
Sand (loose)
28 - 34
Sand (dense)
34 - 45
Silt / Silty sand (loose)
20 - 22
Silt / Silty sand (dense)
25 - 30
Allowable Bearing Pressure (ABP)
Soil Type
KN/m
2
Soft clays and silts
<80
Firm clays and firm sandy clays
100
Stiff clays and stiff sandy clays
200
Very stiff boulder clays
350
Loose well graded sands and gravel/sand mixtures
100
Compact well graded sands and gravel/sand mixtures
200
Loose uniform sands
<100
Compact uniform sands
150
Retaining Wall Design