les reconnaissances géotechniques et diagnostics - CFMS

Show also … ❑ Flooded foreland. ❑ Safety Report ... See also presentation FLI-MAP & Geo data Rhône river dikes (Sylvain) ... www.fugro.com. Back-up slides ...
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LES RECONNAISSANCES GÉOTECHNIQUES ET DIAGNOSTICS Martin van der Meer Fugro Water Services

Les digues fluviales et maritimes Journee technique commune CFGI-CFMS-CFMR Paris, 27 Janvier 2011 www.fugro.com

CONTENTS ƒ Introduction ƒ Flood Risk Management ƒ Fugro’s REAL® - pilot Pays-Bas ƒ Conclusions

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Flood Risk Management – Multi layer strategy



mitigation / evacuation

• spatial planning

• prevention www.fugro.com

Knowledge Transfer Floods NL vs USA

Geo Hazard

Prevention

Floods

EU

Spatial Planning

Mitigation & Emergency Management USA

Earthquakes Landslides Mudflows Etc. Etc.

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LOADS STRENGTH DECISIONS WWW.FLOODCONTROL2015.COM

> SLIDE

CONTENTS ƒ Introduction ƒ Flood Risk Management ƒ Fugro’s REAL® - pilot Pays-Bas ƒ Conclusions

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REAL® Rapid Engineering Assessment of Levees DATA ACQUISITION

SUBSURFACE MODELS

ELEVATION MODELS

3 2 1

REAL-TIME MONITORING

WATER LEVEL SCENARIOS A EN B

1 STRENGTH ASSESSMENT SCENARIO B

2

STRENGTH ASSESSMENT SCENARIO A

3

AUTOMATED STRENGTH ANALYSIS www.fugro.com

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Dike ring 10 ‘Mastenbroek’, NL

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Dike ring 10 ‘Mastenbroek’, NL

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Dike ring 10 ‘Mastenbroek’, NL • total dike length 48 km • decomposed to 70 sections • consulting safety maps?

Base Data ‰ ‰ ‰

Dike DTM & Geo data Subsoil model Hydro geological model

Mechanisms & models ‰ ‰ ‰ ‰

Uplift / heave Underseepage / piping Slope stability (…)

Conditions ‰ ‰ ‰

Fixed water level Rising water level (…) www.fugro.com

Data & Subsoil Model AHN2 & FLI-MAP

river

3D subsoil model

CPT or Boring with location (xyz)

Model of de cpt/ borings in place Lithology

z

x y www.fugro.com

Piping / Specifications Water Level Safety Factor

‰ Free selection ‰ Predicted ‰ Actual…

Predicted Actual

Mechanism & model ‰ ‰ ‰ ‰ ‰ ‰ ‰

Uplift Piping / Bligh Piping / Sellmeijer old Piping / New model NL Slope Stability / simple Overtopping / simple …

Present as … ‰ ‰ ‰ ‰

Settings Creep factor Bligh : Entrance line : Seepage length margin : Top layer heave factor : Top layer margin : Hydraulic Response : Ditch level : Traffic load :

15 outer toe 0m 0,6 0m 70% NAP -1,3m -

Safety Factor (-) Surface Deficit (m) Failure Probability (1/y) …

Show also …

100 m

‰ ‰ ‰ ‰

Flooded foreland Safety Report Inspection Results DAM calculations www.fugro.com

Slope Stability / Fixed water level Stability Factor

SLOPE STABILITY

DAM module Automated MStab Slope Stability Calculations www.fugro.com

Uplift & Piping / Rising water level UPLIFT

PIPING

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Piping / Sensitivity Analysis

Worst case 1 / 10,000 water level Thickness cover layer margin Creep factor Bligh Response factor groundwater Seepage length margin

+0.3m -0.5m 21 1.0 -5m

Best case 1 / 2,000 water level Thickness cover layer margin Creep factor Bligh Response factor groundwater Seepage length margin

0 +0.5m 15 0.6 +5m www.fugro.com

Piping / Fixed water level / Safety Report

Settings 1/2,000 water level Thickness cover layer margin Creep factor Bligh Response factor groundwater Seepage length margin

0 0 15 0.7 0

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Piping / Fixed water level / Flooded foreland Model of underseepage high daily water conditions conditions (safety)

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CONCLUSIONS ƒ Integrated Flood Risk Management (prevention, spatial planning and mitigation) needs solid data ƒ High quality data sets provide added ‘users value’ when combined and used for REAL® solutions ƒ See also presentation FLI-MAP & Geo data Rhône river dikes (Sylvain) www.fugro.com

Merci

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Back-up slides

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Uplift / Fixed water level / Inspection

Inspection data? - below / at / above

fixed water level?

- worse / same / better dike conditions?

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GeODin

Data? - bla - bla

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Objects / Tree Risk Mapping Data collection & processing

Analysis DTM

Dike safety profile Location and width zone of influence object (RD and NAP)

Grid calculations to assess available object space

Part zone of influence interfering with dike safety profile

Results

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3D subsoil model - validation

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Geological Map - Top layer

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Sacramento Valley

Robla Creek

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NEMDC-East

Sacramento Valley

Does not meet Piping Requirement - -

10 year event

00+00 Sta 2

Does not meet Slope Stability Requirement- -

Does not meet Piping Requirement -

Does not Slope Stability Requirement -/+

Meets Piping Requirement +/-

Meets Slope Stability Requirement +/-

Meets Piping Requirement + +

Meets Slope Stability Requirement + +

95+00 Sta 1

Robla Creek

90+00 Sta 1 ®

REAL method www.fugro.com NEMDC-West

NEMDC-East

Sacramento Valley

Does not meet Piping Requirement - -

100 year event

00+00 Sta 2

Does not meet Slope Stability Requirement- -

Does not meet Piping Requirement -

Does not Slope Stability Requirement -/+

Meets Piping Requirement +/-

Meets Slope Stability Requirement +/-

Meets Piping Requirement + +

Meets Slope Stability Requirement + +

95+00 Sta 1

Robla Creek

90+00 Sta 1 ®

REAL method www.fugro.com NEMDC-West

NEMDC-East

Sacramento Valley

Does not meet Piping Requirement - -

200 year event

00+00 Sta 2

Does not meet Slope Stability Requirement- -

Does not meet Piping Requirement -

Does not Slope Stability Requirement -/+

Meets Piping Requirement +/-

Meets Slope Stability Requirement +/-

Meets Piping Requirement + +

Meets Slope Stability Requirement + +

95+00 Sta 1

Robla Creek

90+00 Sta 1 ®

REAL method www.fugro.com NEMDC-West

NEMDC-East

Geo Risk Management – Leading countries

Geo Hazard

Floods

Prevention

NL

Earthquakes Landslides

Spatial Planning

Mitigation & Emergency Management USA

USA HK

FR

Mudflows Etc. Etc.

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