INTEREST OF ACCURATE 3D GEOMODELS FOR GEOTECHNICAL ... · Particular difficulties in modelling :...
Transcript of INTEREST OF ACCURATE 3D GEOMODELS FOR GEOTECHNICAL ... · Particular difficulties in modelling :...
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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
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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
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01.
WHO IS EGISSome key references
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BIM and GEOTECHNICS 4
€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%
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BIM and GEOTECHNICS 5
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
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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
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02.
EAST EUROPEAN HIGH SPEED LINELorraine, France
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Presentation of Egis | Date8
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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
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Presentation of Egis | Date9
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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
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03.
NEW COASTAL ROADLa Reunion Island, France
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Presentation of Egis | Date11
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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.
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Presentation of Egis | Date12
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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
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04.
A304 MOTORWAYArdennes, France
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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
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Presentation of Egis | Date15
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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
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HIGHWAY A304 (ARDENNES, FRANCE)
3D view of the D5 cut with its boreholes and the fence diagrams on the cross sections
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HINKLEY POINT EPR(NUCLEAR REACTOR)
Somerset, United Kingdom
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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
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Presentation of Egis | Date19
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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
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Presentation of Egis | Date20
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HINKLEY POINT C EPR NUCLEAR POWER STATION, UK
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TO CONCLUDEBenefits and interest of 3D geomodeling
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BIM and GEOTECHNICS 22
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