This document discusses the design of reinforced soil structures and earth-retaining walls. It covers the construction procedure for reinforced soil walls including placing and compacting layers of fill and reinforcement materials. Issues with corrosion of reinforcement are mentioned. The roles and responsibilities, limit state design approach, reduction factors, wall dimensions, embedment, design limit states, and interface issues between wall designers are reviewed. Drainage considerations like strip drains, weepholes and embankment fill are also addressed.

1. The Design of
Earth-retaining Structures
ENB485
Chris Bridges
The Design of
Earth-retaining Structures
ENB485
Chris Bridges
May 2016
Lecture 4
Design of Earth-retaining Structures

2. 14
Reinforced soil
structures

3. Reinforced Soil Structures
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4. Construction Procedure
(1) (2)
(3)
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5. Construction Procedure (cont.)
(5)
(6) (7)
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(4)

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7. Issues with corrosion?
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8. Reinforced Soil Walls
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9. Reinforced fill properties
It must be inert, hard, durable
granular material free from
organic or other deleterious
material including
contaminants.
See also R58 & R59
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10. Reinforced Soil Walls – R57
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11. Roles & Responsibilities
Only approved proprietary products can be used.
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12. Limit State Design
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13. Reduction factors
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14. In QLD, no bridge
loads may be
transferred to the RSW
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Peak Values
fcv Values
Granular Soils:
f’max = 30 + A + B + C
f’crit = 30 + A + B
AS4678:2002 (Table D1):
C = 0 to 9

15. Material factors
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16. Wall model
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19. Minimum Wall Dimensions
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Wall Dimensions

21. Wall Dimensions
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22. Wall Embedment
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23. Design Limit States
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24. Steel straps
Geogrids
Wall Friction Angle
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25. Sliding
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Economic ramification factor
Vertical load/linear m on
wall base
Horizontal load/linear m on back of wall

26. Bearing
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27. Serviceability
Ultimate
Global Stability
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28. Interface issues between wall designers

30. GENERAL
EMBANKMENT FILL

31. 15
Drainage

32. Drainage

33. Drainage

37. Strip Drains

38. Strip Drains

39. Weepholes

42. N

47. Ref.: Geoguide 1
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