Scholarly record

DEPLOYMENT OF FBG SENSORS IN STATIC LOAD TEST OF DIAPHRAGM WALL - FIELD TEST

Kristýna Čápová, Robert Jára, Jan Včelák

Abstract

Fiber Bragg Grating (FBG) sensors are used worldwide in structural health monitoring as a highly effective strain sensing method. Compared to traditional strain sensing methods in geotechnics, such as measurement by extensometers, deformeters, or strain gauges, FBG technology is beneficial in many issues, such as small dimensions of the sensor, easy and fast installation, long-term stability, immunity to electromagnetic interference or possibility of having dozens of sensing points on a single measuring cable. One part of the D3 highway construction, connecting the capital city Prague with southern Bohemia, is Pohurka tunnel in the suburbs of the city of Ceske Budejovice. With regard to the geomorphology of the locality and directional and elevational design of the highway, the tunnel is designed to be cut and cover. It has two 995.5 m long tubes, guided in two opposing curves. Due to complicated geotechnical and hydrogeological conditions in combination with demanding construction, static load tests of selected individual lamellae of diaphragm walls designed as retaining, load-bearing as well as sealing structures of the cut and cover tunnel were planned. Two test lamellae were instrumented for the purpose of static load test by resistance strain gauges, as well as FBG sensors. After the load tests, the results from both measurement technologies were compared to each other. The differences between the values obtained from FBG sensors and the values from strain gauges are acceptable enough; both measuring technologies proved their suitability in static load test of a diaphragm walls.

Publication Impact Profile

• Captures
• Mendeley - Readers: 1

PLUMX see details

DOI resolver: doi.org/10.5593/sgem2020/1.1/s02.056

Publication details

Back to publication list