Abstract
Excavation of deep underground openings causes redistribution of primary stresses and induces initiation and propagation of micro cracks. Changes in rock properties ahead of an advancing tunnel face may influence stability and penetration rates in TBM tunneling. This study is part of a PhD project where the focus is on stress-induced micro cracking and its influence on rock strength reduction. We demonstrate results from acoustic emission (AE) measurements on two homogeneous diorite samples tested under uniaxial compression. The aim was to gain information about the influence of experimental setup and settings on AE events in brittle rock. From the stress strain curve and the number of acoustic signals, main deformation stages could be determined. A three-dimensional localization of acoustic events showed a typical conjugate shear system. Future work will include tests on different rock types after inducing controlled damage by uniaxial loading. Lateral strain measurements combined with AE analysis will be applied in order to quantify rock damage and its influence on rock strength.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Bancroft S (1985) An algebraic solution of the GPS equations. IEEE Trans Aerosp Electron Syst AES-21 7:56–59
Bieniawski ZT (1967) Mechanism of brittle fracture of rock. Int J Rock Mech Min Sci 4:395–406
Cai M, Kaiser P, Tasaka Y, Maejima T, Morioka H, Minami M (2004) Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations. Int J Rock Mech Min Sci 41(5):833–847
Eberhardt E, Stead D, Stimpson B (1999) Quantifying progressive pre-peak brittle fracture damage in rock during uniaxial compression. Int J Rock Mech Min Sci 36:361–380
Geiger L (1910) Herdbestimmung bei Erdbeben aus den Ankunfts-zeiten. Kgl Ges d Wiss Nachrichten Math-Phys Klasse 4:231–349
Grosse C, Ohtsu M (2010) Acoustic emission testing. Basics for research—applications in civil engineering. Springer, Berlin, 396 p
Kurz JH (2006) Verifikation von Bruchprozessen bei gleichzeitiger Automatisierung der Schallemissionsanalyse an Stahl- und Stahlfaserbeton. Diss., Institut für Werkstoffe im Bauwesen, Universität Stuttgart, Stuttgart, 197 p
Martin CD, Read RS, Martino JB (1997) Observation of brittle failure around a circular test tunnel. – Int J Rock Mech Min Sci 34(7):1065–1073
Meglis IL, Engelder T, Graham EK (1991) The effect of stress-relief on ambient microcrack porosity in core samples from the Kent Cliffs (New York) and Moodus (Connecticut) scientific research boreholes. Tectonophysics 186:163–173
Mutschler T (2004) Neufassung der Empfehlung Nr. 1 des Arbeitskreises “Versuchstechnik Fels” der Deutschen Gesellschaft für Geotechnik e. V.: Einaxiale Druckversuche an zylindrischen Gesteins-prüfkörpern. Bautechnik 81(10):825–834
Teufel LW (1989) Acoustic emissions during anelastic strain recovery of cores from deep boreholes. In: Khair (ed) Rock mechanics as a guide for efficient utilization of natural resources. Balkema, Rotterdam, pp 269–276
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this paper
Cite this paper
Wieser, C. et al. (2015). Acoustic Emission Technique to Detect Micro Cracking During Uniaxial Compression of Brittle Rocks. In: Lollino, G., et al. Engineering Geology for Society and Territory - Volume 6. Springer, Cham. https://doi.org/10.1007/978-3-319-09060-3_81
Download citation
DOI: https://doi.org/10.1007/978-3-319-09060-3_81
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-09059-7
Online ISBN: 978-3-319-09060-3
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)