The BOTDR-based distributed monitoring system for slope engineering (2006)

Conventional monitoring instruments such as displacement meters, pore water pressure manometers and strain gauges are commonly used in slope stability monitoring. These monitoring instruments mostly belong to the single or multi-point mode, so the monitoring results are often affected by the measuring point arrangement. With the development of fibre optic sensing technology, it is possible to make continuous and distributed monitoring for civil structures and slope engineering using fibre optic sensing technologies, which can overcome some deficiencies of traditional monitoring technologies. Thus, the distributed fibre optic sensing technologies potentially have a wide application in engineering monitoring. The BOTDR-Brillouin Optical Time-Domain Reflectometer is a recently developed distributed fibre optic strain monitoring technology, which has the advantages of long distance, distributed, interference-free and endurance. It has been applied in the health monitoring of civil engineering and geotechnical engineering. Based on the characteristics of slope engineering, the feasibility of BOTDR's application in slope engineering monitoring is analyzed and a set of BOTDR-based monitoring methods for slope engineering is put forward in this paper. A case study is used to illustrate the implementation procedure and validity of using it. A framework for the BOTDR-based monitoring system for slope engineering is established. Finally, further research and application topics are proposed. Resume: Des instruments de surveillance conventionnels tels que des metres de deplacement, des manometres de pression d'eau interstitielle et des jauges de contrainte sont generalement utilises dans la surveillance de stabilite de pente. Ces instruments de surveillance appartiennent la plupart du temps au mode simple ou multipoint, ainsi les resultats de surveillance sont souvent affectes par l'arrangement de poste de mesure. Avec le developpement de la technologie de sensation a fibres optiques, il est possible de faire la surveillance continue et distribuee pour les structures et la technologie civiles de pente en utilisant les technologies de sensation a fibres optiques, qui peuvent surmonter quelques insuffisances des technologies de surveillance traditionnelles. Ainsi, les technologies de sensation a fibres optiques distribuees ont potentiellement une application large dans la surveillance de technologie. Le Reflectometre Optique de Temps-Domaine de Brillouin (BOTDR) est une contrainte a fibres optiques distribuee recemment developpee surveillant la technologie, qui a les avantages de de fond, distribue, interference-libre et la resistance. Il a ete applique dans la surveillance de sante du genie civil et de la technologie geotechnique. Base sur les caracteristiques de la technologie de pente, la praticabilite de l'application de BOTDR dans la surveillance de technologie de pente est analysee et un ensemble de methodes de surveillance BOTDR-basees pour la technologie de pente est propose en cet article. Une etude de cas est employee pour illustrer le procede d'execution et la validite de l'employer. Un cadre pour le systeme de surveillance BOTDR-base pour la technologie de pente est etabli. En conclusion, on propose d'autres recherche et matieres d'application.