Erosion Detection with a Fiber Optic Sensor-Enabled Geotextile Olivier ARTIERES Yves-Laurent BECK Cyril GUIDOUX TenCate Geosynthetics edf geophyconsult
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.
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
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
Examples 1. Experimental dike : Ijkdijk piping (NL) 2. Canal dike (Marne to Rhine) (F)
IjkDijk project Piping experiment (2009) Downstream and upstream the experimental dike Sensor Fibre optics geotextile Clay Sand
IjkDijk project Piping experiment 15 m 1/3 Visible piping channels
IjkDijk project - Piping experiment 1/3 Collapse : 05/12/09 12:00
top view 12 waterflow y x Upstream Temperature Strain 30/11/09 12:30 Downstream geophyconsult
top view waterflow y x Upstream Temperature Strain 01/12/09 12:00 Downstream geophyconsult
top view 14 waterflow y x Upstream Temperature Strain 02/12/09 12:00 Downstream geophyconsult
top view 15 waterflow y x Upstream Temperature Strain 03/12/09 12:00 Downstream geophyconsult
top view 16 waterflow y x Upstream Temperature Strain 04/12/09 12:00 Downstream geophyconsult
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
top view 18 waterflow y x Upstream Temperature Strain 05/12/09 00:00 Downstream geophyconsult Collapse 12 h 05/12/09 12:00
top view 19 waterflow y x Upstream Temperature Strain 05/12/09 06:00 Downstream geophyconsult Collapse 6 h 05/12/09 12:00
top view 20 waterflow y x Upstream Temperature Strain 05/12/09 12:00 Downstream geophyconsult Collapse 05/12/09 12:00
Examples 1. Experimental dike : Ijkdijk piping (NL) 2. Canal dike (Marne to Rhine) (F)
Marne to Rhine canal dike (F)
Marne to Rhine canal dike (F)
Marne to Rhine canal dike (F) MIDDLE TOP
Marne to Rhine canal dike (F) TOP MIDDLE FIELD BOTTOM
Marne to Rhine canal dike (F) FILTRATION GEOTEXTILE
Marne to Rhine canal dike (F) Raw temperature data 17.04.2009 60 m 20 m 20 m 20 m 40 m 24.08.2009 Time
Marne to Rhine canal dike (F) Processed temperature data on 25.04.2009 edf models 60 m 40 m 20 m 40 m
Marne to Rhine canal dike (F) 27.06.2009 Raw strain data Top 45 m (0,03%) Middle Bottom 30.09.2009 Time 10 m
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
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