20/05/2008 LimitState:GEO launch & technology briefing - ICE London 03/08/2015geo1.0 LimitState:GEO...

20/05/2008 LimitState:GEO launch & technology briefing - ICE London 19/04/23 geo1.0

LimitState:GEOLimitState:GEOVerificationVerification

Colin Smith MA(Cantab) PhD

Director & LimitState:GEO Product Manager, LimitState Ltd

20/05/2008 LimitState:GEO launch & technology briefing - ICE London

Contents

Validation of LimitState:GEO results

• Academic publications• Report output• Benchmark solutions


Academic publications


Academic papers

• Footings on frictional soil• Footings on confined layers

Smith, C. & Gilbert, M. (2007) Application of discontinuity layout optimization to plane plasticityproblems. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463(2086), 2461–2484.

• Footings on layered soils • Modelling of water pressures in DLO

Smith, C. C. & Gilbert, M. (2007)New upper bound solutions for layered soil bearing capacity problems using discontinuity layout optimization, 10th Australia New Zealand Conference onGeomechanics, Brisbane, pp. 250–255.


Academic papers

• Slope stability analysis• Footings on slopes

Smith, C. & Gilbert, M. (2008)Limit analysis of the stability of foundations on inclined ground,2nd BGA International Conference on Foundations, Dundee (accepted).

• Pipeline bearing capacity Lee, Y., Smith, C. & Cheuk, C. Y. (2008) Bearing capacity of embedded foundations, 2nd BGA International Conference on Foundations, Dundee (accepted).


Report output


Report output

Free body diagrams with equilibrium equations facilitate easy verification


Benchmarks


Benchmarks

Failure mechanism(results in terms of collapse load)

LimitState:GEO

solutionBenchmark Variation

Factor on cu or tanφ

5.17 5.14 0.6% 0.6%

633 607 4.3% 0.8%

undrained

drained

cu = 1, weightless

Φ = 30º, γ = 20 , q = 20


Benchmarks

Failure mechanism(results in terms of collapse load)

LimitState:GEO



3.08 3.10 -0.6% -0.6%

0.166 0.166 0.0% 0.0%

undrained

drained

Φ = 30º, γ = 1

cu = 1, γ = 1


Benchmarks

Failure mechanism(results in terms of factor on soil

strength)

LimitState:GEO



6.186.06

(Taylor)2.0% 2.0%

3.53 3.49(Whitlow)

1.1% 1.1%

undrained

drained

cu = 1, γ = 1, H =1

c' = 0.15, φ‘ = 40º, γ = 1, H =1


Conclusions


Conclusions

LimitState:GEO results computed using Fine resolution. Accuracy may be improved by increasing resolution further.

• Typical error in estimated collapse loads = 0 – 5%

• For frictional soils, it is better to consider error in input parameters

• Typical error in input parameters (cu or tanφ) = 0 – 2%

20/05/2008 LimitState:GEO launch & technology briefing - ICE London 03/08/2015geo1.0 LimitState:GEO...

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