Transcript Slide 1

LimitState:GEO
Case Study
Colin Smith
MA(Cantab) PhD
Director & LimitState:GEO Product Manager, LimitState Ltd
17/07/2015
geo1.0
Introduction
17/07/2015
geo1.0
Problem specification
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An existing embankment is to be widened
A stem wall is to be constructed and backfilled with granular material
The widened embankment is to take additional loading.
How wide (B) should the stem wall be?
10kN/m2
45kN/m2
10kN/m2
Φ = 34º, γ = 18kN/m3
5m
Φ = 27º, γ = 18kN/m3
B
20/05/2008
LimitState:GEO launch & technology briefing - ICE London
Analysis
Rankine analysis using a virtual back is difficult due to
the varied surface loads and the inclined soil interface
20/05/2008
LimitState:GEO launch & technology briefing - ICE London
Analysis
Coulomb analysis more appropriate using a virtual back
and a range of wedge angles
20/05/2008
LimitState:GEO launch & technology briefing - ICE London
Analysis
Initial design might conservatively assume a frictionless
virtual back to keep calculations simple
W
P
P
W
R
S
N
20/05/2008
LimitState:GEO launch & technology briefing - ICE London
LimitState:GEO Analysis
• Start with a DXF import of initial design
20/05/2008
LimitState:GEO launch & technology briefing - ICE London
geo1.0:
Analysis
17/07/2015
geo1.0
Analysis
• At this stage, LimitState:GEO was used to analyse the problem as
described in the previous slides
(Hands on demo of
Analysis
software)
20/05/2008
LimitState:GEO launch & technology briefing - ICE London
Conclusions
• LimitState:GEO provides flexibility to rapidly consider a range of
design scenarios
• It automatically selects the critical mechanism eliminating the need
to separately consider e.g. sliding, bearing failure, global stability
etc.
• Specific failure modes can be ‘forced’ if required
• Handles complex boundary conditions that would otherwise
require simplifications and assumptions by conventional methods
20/05/2008
LimitState:GEO launch & technology briefing - ICE London