Post on 05-Jul-2018
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Retaining Walls
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Stability analysis of gravity walls
Gravity walls depend on their self
weight to achieve stability
Modes of failure to be analysed:
• Overall failure (analysis will be consideredunder topic “Slope stability”)
• Sliding along the base
• Overturning about the toe
• Bearing capacity at the base
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Stability analysis of gravity walls
Source: HK Geoguide 1 –
Guide to Retaining Wall Design
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Stability analysis of gravity walls
Traditional or Factor of safety approach:
Factor of safety against sliding =
= 2 (minimum)
Factor of safety against overturning =
= 2 (minimum)
Maximum bearing pressure < Allowable bearing capacity
forcesDisturbing
forcesResisting
momentsDisturbing
momentsResisting
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Stability analysis of gravity walls
To ensure that the bearing pressure is compressive
beneath the foundation, the base resultant must be
located within the middle third of the base.
RH RH RH
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Stability analysis of gravity walls
BS 8002: Limit states approach
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Stability analysis of gravity walls