Ground Penetrating Radar

Comments

Transcription

Ground Penetrating Radar
Ground Penetrating Radar
Anne Lalagüe
SINTEF Veg‐ og jernbaneteknikk
SINTEF Byggforsk
3D - Georadar
ƒ GeoScopeTM GPR
ƒ 100 Mhz – 3 Ghz
ƒ 31 elements
ƒ Scan width: 2,25 m
ƒ RoadDoctorTM
SINTEF Byggforsk
3D – Georadar
SINTEF Byggforsk
Penetration depth
Depends on:
1.
GPR frequency
High frequency : penetration depth բ , resolution ա
Low frequency : penetration depth ա , resolution բ
2.
Conductivity of materials
Low: penetration depth ա (sand, rocks, plastic, ice...)
High: penetration depth բ (metal, clay, saline soils)
Usually : ≈ 3m
SINTEF Byggforsk
Determination of space behind
concrete lining in tunnels using GPR
SINTEF Byggforsk
Determination of space behind concrete
lining in tunnels using GPR
After the accident in Hanekleiva tunnel, it was decided to inspect the rock surface behind frost insulating walls in all tunnels in Norway.
SINTEF Byggforsk
Determination of space behind concrete
lining in tunnels using GPR
These walls where not designed with inspection hatches and the distance between the wall and the rock surface is in most cases not known.
SINTEF Byggforsk
Determination of space behind concrete
lining in tunnels using GPR
1m/1,5m
high
002
003
004
001
2m/2,5m high
SINTEF Byggforsk
Determination of space behind concrete
lining in tunnels using GPR
SINTEF Byggforsk
Roads and Pavements
SINTEF Byggforsk
E14 – E39
SINTEF Byggforsk
E14 – E39
SINTEF Byggforsk
E14 – E39
SINTEF Byggforsk
E14 – E39
SINTEF Byggforsk
Location of peat in Helgeland
SINTEF Byggforsk
Location of pipes
SINTEF Byggforsk
Location of pipes
Distance
(m)
80
145
170
226
338
360
478
504
542
592
Depth
(m)
1,1
1,1
1,1
1,6
1,2
1,3
1,0
1,1
1,1
1,6
SINTEF Byggforsk
Location of culvert
SINTEF Byggforsk
PhD Projects
SINTEF Byggforsk
Location of the frost line by GPR - SIP
SINTEF Byggforsk
FV 512 - hp01: Wintertime (March)
Frost line
SINTEF Byggforsk
FV 512 - hp01: Springtime (April)
Frost line
SINTEF Byggforsk
FV 512-hp01 : summertime (July)
SINTEF Byggforsk
FV 512-hp01 : Cross sections
winter
spring
summer
SINTEF Byggforsk
Depth8 [m]
1
1,2
1,4
1,6
1,8
2
SINTEF Byggforsk
510
498
482
469
454
441
429
415
400
381
363
349
339
329
313
297
284
270
255
243
230
216
204
190
174
160
146
131
116
104
90,9
78,2
67,2
54,8
44,7
34
21,9
11
1,21
Frost lines: exported to Excel
Distance [m]
0
0,2
0,4
0,6
0,8
Winter
Spring
Also:
ƒ
Data accuracy
ƒ
Pipe leakages
ƒ
SmartSalt
Soon:
ƒ Tunnel investigation
ƒ Railway ballasts
SINTEF Byggforsk
Thank you for your attention
SINTEF Byggforsk

Similar documents