INTEREST OF ACCURATE 3D GEOMODELS FOR GEOTECHNICAL ... · Particular difficulties in modelling :...

Jean-Marie LEONARD

INTEREST OF ACCURATE 3D GEOMODELS FOR GEOTECHNICAL PROJECTS AND INTEROPERABILITY BETWEEN GEOLOGY AND BIM

Part 1 : Benefits of Geomodeling for Infrastructures and Industrial Sites

BIM and GEOTECHNICS 2

CONTENTS01. WHO IS EGIS

02. EAST EUROPEAN HIGH SPEED LINE, FRANCE

03. NEW COASTAL ROAD, LA REUNION ISLAND

04. A304 MOTORWAY, FRANCE

05. HINKLEY POINT EPR (NUCLEAR REACTOR), UK

06. CONCLUSION

01.

WHO IS EGISSome key references

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€1.13 Billion 70% 30%Engineering Operation and mobility services

14,850 EMPLOYEES IN THE WORLD 8,750 IN ENGINEERING 6,100 IN OPERATION

Egis brings together companies specialized in numerous sectors of activity, in France and abroad.

MANAGED TURNOVER IN 2018

Graphique1

Rail

Bâtiment

Route

Eau & Ports

Aviation

Energie & Environnement

Villes

Mobilités

Ventes

Rail

30

Buildings

25

Roads18%

Water & Ports7%

Aviation6%

Energy & Environment 7%

Urban development

4

Mobility3%

0.3

0.25

0.18

0.07

0.06

0.07

0.04

0.03

Sheet1

Ventes

Rail30.0%

Bâtiment25.0%

Route18.0%

Eau & Ports7.0%

Aviation6.0%

Energie & Environnement7.0%

Villes4.0%

Mobilités3.0%

100.0%

Graphique1

Exploitation routière

Services à la mobilité

Exploitation aéroportuaire

Energie

Ventes

Road operation67%

Mobility services20%

Airport operation10%

Energy3%

Aviation7%

Énergie & Environnement

6

Villes

5

Mobilités

3

0.67

0.2

0.1

0.03

Sheet1

Ventes

Exploitation routière67.0%

Services à la mobilité20.0%

Exploitation aéroportuaire10.0%

Energie3.0%

100.0%


OUR GEOGRAPHICAL FOOTPRINT 63%of our businessoutside France

France

37%Europe

22%

Excl. France)

Middle East

13% Asia

8%

Australia-Oceania

2%Africa

9%

Americas

9%

Zones recording growthLatin America (notablyMexico), Asia, Europe

Slower businessin the Middle East

TURNOVER BREAKDOWN BY GEOGRAPHICAL ZONE

59 %of our businessIn Europe

59%of our businessIn Europe

Presentation of Egis | Date6

Linear infrastructures and industrial or urban platforms :Hinkley Point EPR, Grand Paris projects, Birmingham and Marseille tramways, Euroairport Basel Mulhouse Freiburg, A10 motorway, Monaco offshore expansion, Doha Expressways in Qatar, etc.

SEVERAL BIM PROJECTS

© EDF / Thinkstock Xavier Marchant / Egis / Egis Joël Ruf / XXLPhoto / SRL2 Laurent Carte / Groupe 6

02.

EAST EUROPEAN HIGH SPEED LINELorraine, France




8

THE EAST EUROPEAN HIGH SPEED LINE One of our first projects ( 1999 – 2001) : We did the studies of a section of 60 kms in Lorraine (North-East France) The model was built with GDM 4.2 (BRGM)

General objectives and interest of geomodelingfor the linear infrastructures :

To draw the geotechnical longitudinal profile with theboreholes and their data (in situ tests).

To draw the unmapped faults To export the geometry of the layers in order to calculate

the resource volumes, layer by layer with CUBATOR (anEGIS software)

To optimize the project design by adapting the alignmentand the elevation of the red line.

To increase the quantity of noble materials thanks to theopportunity to enlarge a cut and to exploit it as a quarryand to reduce the volume of the least interestingmaterials.

To optimize the earthworks management plan byreducing the transport of the materials Cross-section in the cut DB-24( Cotes-de-Moselle, Lorraine)

with 2 faults detected by boreholes data


9

THE EAST EUROPEAN HIGH SPEED LINE

General difficulties in modelling an infrastructure : A linear infrastructure needs to build a set of models

along the axis for covering the project. The boreholes are positioned along the axis. The

inclination of the layers is poorly modelled on the crosssections if there is no data outside the project.

We have deep drilling only for the cuts and trial pits forthe fills. If a fault is in a talweg or a valley, we generallyhave no information to appreciate the throw of the fault. Cross-sections in the fill RB-23 and the cut DB-24

in the Cotes-de-Moselle, Lorraine, France

05. AWARDS

03.

NEW COASTAL ROADLa Reunion Island, France




11

A huge project with VINCI Construction : The RN1 current road is located between the Indian Ocean and the cliff

face. It is subject to rockslides, rain floods and flooding due to high tides. The new infrastructure is far from the cliff. It is 12.5 kms long with a

viaduct of 5.4 kms long and 30 meters wide.

Particular objectives of the 3D geomodel : To draw the geotechnical longitudinal profile and the cross sections in

particular for each bridge pile To model the basaltic substratum and the layers which allow a good

anchorage of the bridge piles. To model the upper layer of fine sand that fluctuates with the swell and

the storms

NEW COASTAL ROAD, REUNION ISLAND

Particular difficulties in modelling : There are even fewer drillings than for modeling a terrestrial

infrastructure The boreholes data of the project were of poor quality and the

geotechnical data of the current road were no more available The marine sediments come from the erosion of the volcano-

sedimentary rocks and rockslides from the cliff.


12

Solution of geomodeling using geophysical data A campaign of seismic reflection has provided data for two

longitudinal profiles and 30 cross sections A good correlation between the velocity curves and the limits

of the layers given by the boreholes was found and it allowedus to build a first 3D geomodel for the feasability studies.

NEW COASTAL ROAD, REUNION ISLAND

Basalt (substratum)

Fine and coarse sands

04.

A304 MOTORWAYArdennes, France




14

A304 MOTORWAY (ARDENNES, FRANCE) Objectives of the 3D geomodel : To model the Lias formations and in particular to model the limit between the

Pliensbachian (I5) and the Toarcian (I6) and also the limits with the alluviums (F). The clays of the 2 lower Jurassic formations are very hard to distinguish on the field

but the lower Toarcian is missing and I thought, it could be interesting in modelingthe interface between these formations.

J1

I6

I6

I5FF

I5

Solution used for building the geomodel We added boreholes data from the open BRGM

database (very helpful but not sufficient) We added the formation boundaries from the

geological map with ArcGis in using thevectorised map provided by BRGM (CHARM-50database).

The boreholes data of the project and the BRGMdatabase were combined with the vectorisedboundaries of the geological map to get a 3Dgeological model with 4 formations.

From this first geological model, 2 superficialformations (Altered Lias and Plateau Loams)were modelled in thickness to get a 3Dgeotechnical model with 6 formations.1 / 50 000 geological map Digitized geological map

under GDM-Multilayer


15

Altered LiasPlateau Loams

HIGHWAY A304 (ARDENNES, FRANCE) Benefits of the model As we could characterize the limit between

the Pliensbachian and the Toarcianformations in the 3D model, the samples ofboth formations were separated and theProctor compaction tests showed that thePliensbachian clays were reusable with a 2%lime treatment whereas those of theToarcian remained swelling and had to beput in deposits.

For the cuts that crossed only the Toarcian,the red line was raised in order to reducethe volume of non reusable materials.

Thanks to this model,we have saved a lot ofmoney on earthworks !

Top : longitudinal profile in the cut D5

Bottom : 2 cross sections at the kilometric points 4+950 and 5+050


16

HIGHWAY A304 (ARDENNES, FRANCE)

3D view of the D5 cut with its boreholes and the fence diagrams on the cross sections

05.

HINKLEY POINT EPR(NUCLEAR REACTOR)

Somerset, United Kingdom




18

Special objective of the 3D model : The 3D geomodel was built to make technical analysis by finite element

computation with FLAC-3D (Itasca).

Available data : A detailed geological (biostratigraphic) map with the ammonite

biozones of the Hettangian and the Sinemurian limestone formations Around 300 vertical and inclined boreholes with the half having a

detailed biostratigraphic interpretation Several interpreted cross sections thanks geophysical data

Main difficulties : The area of modeling is strongly faulted (compressive shear zone)

HINKLEY POINT EPR (NUCLEAR REACTOR), UK


19

HINKLEY POINT EPR (NUCLEAR REACTOR) Benefits of biostratigraphic model

The fossils are generally considered to have no interest in geotechnics. The case ofHinkley shows that, on the contrary, the biostratigraphic interpretation allows todetail boreholes and to make better correlations.

Because the 5 limestone formations of Blue Lias have the same mechanicalproperties, the error would be to group these formations for building the 3Dgeotechnical model directly. The right process is to build a first 3D biostratigraphicmodel and to group the modeled limestone layers for the analysis with FLAC 3D.

Model A : Blue Lias not detailed Model B : Blue Lias detailed with biostratigraphic biozones


20

HINKLEY POINT C EPR NUCLEAR POWER STATION, UK

05.

TO CONCLUDEBenefits and interest of 3D geomodeling




3D Geomodelling allows us To optimize the general design and the detailed design of our

projects and the earthwork management plan for the linearinfrastructures.

To realize complex computations (PLAXIS, FLAC-3D, Z-Soil) To check if the foundations are in the good layers

3D Geomodeling and BIM

At Egis, we consider digital modeling and BIM (BuildingInformation Modeling) to be a genuine revolution

Thanks to the RESQML Format and our new software , we areable to transfer a 3D geomodel and its data from GDM-MULTILAYER to AUTODESK CIVIL 3D

BENEFITS OF 3D GEOMODELING FOR CIVIL ENGINEERING

We present a demo about RESQML-CAD and our 2nd part of this talk on Friday during this meeting

Thank you for listening !

Interest of accurate 3D Geomodels for Geotechnical Projects and Interoperability between Geology and BIMcontentsWho is EGISDiapositive numéro 4OUR GEOGRAPHICAL FOOTPRINTSeveral BIM PROJEcTS East European High Speed LineDiapositive numéro 8Diapositive numéro 9New Coastal RoadDiapositive numéro 11Diapositive numéro 12A304 MotorwayDiapositive numéro 14Highway A304 (Ardennes, France)Highway A304 (Ardennes, France)Hinkley Point EPR�(nuclear reactor)Diapositive numéro 18Diapositive numéro 19Diapositive numéro 20To ConcludeDiapositive numéro 22

INTEREST OF ACCURATE 3D GEOMODELS FOR GEOTECHNICAL ... · Particular difficulties in modelling :...

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