Erosion Detection with a Fiber Optic Sensor-Enabled Geotextile. Yves-Laurent BECK
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1 Erosion Detection with a Fiber Optic Sensor-Enabled Geotextile Olivier ARTIERES Yves-Laurent BECK Cyril GUIDOUX TenCate Geosynthetics edf geophyconsult
2 The fiber optic sensor-enabled geotextile Principle It combines : 1. the geotextile mechanical properties (protection, soil friction, reinforcement) and hydraulic properties (filtration, drainage) 2. with the fiber optic sensing technology.
3 Time 4 The fiber optic sensor enabled geotextile : Performance Combined measurement of : Temperature (0.1 C) good indicator of leakage (< 1 l/m/min.) Optical fibre Leakage Distance
4 Time 5 The fiber optic sensor enabled geotextile : Performance Combined measurement of : Temperature (0.1 C) good indicator of leakage (< 1 l/m/min.) Strain (0.01%) good indicator of movement Optical fibre Movement Distance
5 Examples 1. Experimental dike : Ijkdijk piping (NL) 2. Canal dike (Marne to Rhine) (F)
6 IjkDijk project Piping experiment (2009) Downstream and upstream the experimental dike Sensor Fibre optics geotextile Clay Sand
7 IjkDijk project Piping experiment 15 m 1/3 Visible piping channels
8 IjkDijk project - Piping experiment 1/3 Collapse : 05/12/09 12:00
9 top view 12 waterflow y x Upstream Temperature Strain 30/11/09 12:30 Downstream geophyconsult
10 top view waterflow y x Upstream Temperature Strain 01/12/09 12:00 Downstream geophyconsult
11 top view 14 waterflow y x Upstream Temperature Strain 02/12/09 12:00 Downstream geophyconsult
12 top view 15 waterflow y x Upstream Temperature Strain 03/12/09 12:00 Downstream geophyconsult
13 top view 16 waterflow y x Upstream Temperature Strain 04/12/09 12:00 Downstream geophyconsult
14 top view 17 waterflow y x Upstream Temperature Strain 04/12/09 18:00 Downstream 1/3 1/3 geophyconsult Collapse 18 h 05/12/09 12:00
15 top view 18 waterflow y x Upstream Temperature Strain 05/12/09 00:00 Downstream geophyconsult Collapse 12 h 05/12/09 12:00
16 top view 19 waterflow y x Upstream Temperature Strain 05/12/09 06:00 Downstream geophyconsult Collapse 6 h 05/12/09 12:00
17 top view 20 waterflow y x Upstream Temperature Strain 05/12/09 12:00 Downstream geophyconsult Collapse 05/12/09 12:00
18 Examples 1. Experimental dike : Ijkdijk piping (NL) 2. Canal dike (Marne to Rhine) (F)
19 Marne to Rhine canal dike (F)
20 Marne to Rhine canal dike (F)
21 Marne to Rhine canal dike (F) MIDDLE TOP
22 Marne to Rhine canal dike (F) TOP MIDDLE FIELD BOTTOM
23 Marne to Rhine canal dike (F) FILTRATION GEOTEXTILE
24 Marne to Rhine canal dike (F) Raw temperature data m 20 m 20 m 20 m 40 m Time
25 Marne to Rhine canal dike (F) Processed temperature data on edf models 60 m 40 m 20 m 40 m
26 Marne to Rhine canal dike (F) Raw strain data Top 45 m (0,03%) Middle Bottom Time 10 m
27 Conclusions The fiber optic sensor technology is accurate, reliable, durable and fit the need to monitor long distance hydraulic works The fiber optic sensor-enabled geotextile combines strain/movement and temperature/leakage monitoring, helpful for scour erosion detection
28 Thank you for your attention
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