Monitoring of soil nailed slope stabilizations using distributed fiber optic sensing

  • Soil nailing systems are a common way to stabilize slopes and construction pits. Their design is usually based on the mechanical equilibrium of a rigid body motion and therefore, only tensile stresses are considered and accompanying forces like bending (shear stresses) in the soil nails are neglected. Continuous strain measurements along nails could verify this assumption, but may not be performed using conventional sensing technologies. This paper reports about monitoring of a soil nailed slope stabilization using distributed fiber optic sensing. Soil nails in different anchoring horizons were instrumented and autonomously monitored over several weeks, in which the construction pit was excavated continuously. After the excavation, the final load bearing capacity of one selected nail was determined within a classical geotechnical load test. In addition to the field measurements, the bending behavior of the instrumented nail system was analyzed under laboratory conditions. The presented studies demonstrate the high potential of distributed fiber optic sensing systems and their capability to extend traditional measurement methods in foundation engineering applications.

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Author:Christoph Monsberger, Werner Lienhart, Roman Marte, Sebastian Hirschmüller
Parent Title (English):Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018
Editor:Hoon Sohn
Document Type:Conference Proceeding
Publication Year:2018
Tag:Distributed fiber optic sensing; Soil nailed slope stabilizations; Timber engineering
faculties / departments:Fakultät für Holztechnik und Bau
Forschung und Entwicklung
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten