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- Publisher
- Springer Journals
- Copyright
- Copyright © 2017 by Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany
- Subject
- Earth Sciences; Earth Sciences, general; Geography, general; Environment, general; Ecology
- ISSN
- 1672-6316
- eISSN
- 1993-0321
- DOI
- 10.1007/s11629-016-4166-1
- Publisher site
- See Article on Publisher Site
Abstract
The impact effect of boulder within debris flow is the key factor contributing to peak impact as well as to the failure of debris flow control work. So accurate measuring and calculating the impact force of debris flow can ensure the engineering design strength. However, limited to the existing laboratory conditions and piezoelectric sensor performance, it is impossible, based on the conventional measurements, to devise a computing method for expressing a reliable boulder impact force. This paper has therefore designed a new measurement device according to the method of integrating Fiber Bragg grating (FBG) and reinforced concrete composite beam (RCB) for measuring the impact force of debris flows, i.e. mounting FBG on the axially stressed steel bar in the composite beam at regular intervals to monitor the steel strain. RCB plays the role of contacting debris flow and protecting FBG sensors. Taking this new device as the experimental object, drop testing is designed for simulating and reflecting the boulder impact force. In a series of impacting tests, the relationship between the peak dynamic strain value of the steel bar and the impact force is analyzed, and based on which, an inversion model that uses the steel bar strain as the independent variable is established for calculating the boulder impact force. The experimental results show that this new inversion model can determine the impact force value and its acting position with a system error of 18.1%, which can provide an experimental foundation for measuring the impact force of boulders within the debris flow by the new FBG-based device.
Journal
Journal of Mountain Science – Springer Journals
Published: Jun 30, 2017