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Design of a measurement assembly to study in situ rock damage driven by freezing


Weber, Samuel; Gruber, Stephan; Girard, Lucas; Beutel, Jan (2012). Design of a measurement assembly to study in situ rock damage driven by freezing. In: Tenth International Conference on Permafrost, Salekhard, Yamal-Nenets Autonomous District, Russia, 25 June 2012 - 29 June 2012, 437-442.

Abstract

We describe the design of an acoustic emission (AE) measurement assembly for reliable acquisition of a multi-year time- series in steep alpine rock-walls. The motivation for collection of these data is to enhance understanding of freezing- induced rock damage. Because measurements in natural rock slopes are challenging, this study investigates technical options suitable to capture AE signals from differing depths while incurring minimal signal loss between the rock and the sensor. We first outline the requirements for the measurement assembly and present two generic solutions to be evaluated and refined. We then present candidate materials for building components of the assembly and experimentally estimate their attenuation coefficients and signal loss at the rock-sensor contacts. Based on these results, we present the final design chosen for the measurement assembly and briefly report initial experiences from a field deployment site at 3500 m a.s.l. at Jungfraujoch, Switzerland.

Abstract

We describe the design of an acoustic emission (AE) measurement assembly for reliable acquisition of a multi-year time- series in steep alpine rock-walls. The motivation for collection of these data is to enhance understanding of freezing- induced rock damage. Because measurements in natural rock slopes are challenging, this study investigates technical options suitable to capture AE signals from differing depths while incurring minimal signal loss between the rock and the sensor. We first outline the requirements for the measurement assembly and present two generic solutions to be evaluated and refined. We then present candidate materials for building components of the assembly and experimentally estimate their attenuation coefficients and signal loss at the rock-sensor contacts. Based on these results, we present the final design chosen for the measurement assembly and briefly report initial experiences from a field deployment site at 3500 m a.s.l. at Jungfraujoch, Switzerland.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), not refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Event End Date:29 June 2012
Deposited On:09 Jan 2013 16:09
Last Modified:06 Apr 2017 07:54
Number:1
ISBN:978-5-905911-01-9
Official URL:http://www.ticop2012.org/upload/iblock/83b/83b336f940efdec30802d3610debb4f1.pdf
Related URLs:http://www.ticop2012.org/

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