Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks

Carola Wieser; Heiko Käsling; Manuel Raith; Ronald Richter; Dorothee Moser; Franziska Gemander; Christian Grosse; Kurosch Thuro

doi:10.1007/978-3-319-09060-3_81

Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks

Carola Wieser, Heiko Käsling, Manuel Raith, Ronald Richter, Dorothee Moser, Franziska Gemander, Christian Grosse, Kurosch Thuro

Technical University of Munich

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

10 Scopus citations

Abstract

Excavation of deep andergroand 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 ander 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.

Original language	English
Title of host publication	Engineering Geology for Society and Territory - Volume 6
Subtitle of host publication	Applied Geology for Major Engineering Projects
Publisher	Springer International Publishing
Pages	465-468
Number of pages	4
ISBN (Electronic)	9783319090603
ISBN (Print)	9783319090597
DOIs	https://doi.org/10.1007/978-3-319-09060-3_81
State	Published - 1 Jan 2015

Keywords

Acoustic emission
Brittle rock
Localization
Micro crack
Uniaxial compression

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10.1007/978-3-319-09060-3_81

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Wieser, C., Käsling, H., Raith, M., Richter, R., Moser, D., Gemander, F., Grosse, C., & Thuro, K. (2015). Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks. In Engineering Geology for Society and Territory - Volume 6: Applied Geology for Major Engineering Projects (pp. 465-468). Springer International Publishing. https://doi.org/10.1007/978-3-319-09060-3_81

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abstract = "Excavation of deep andergroand 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 ander 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.",

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Wieser, C, Käsling, H, Raith, M, Richter, R, Moser, D, Gemander, F, Grosse, C & Thuro, K 2015, Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks. in Engineering Geology for Society and Territory - Volume 6: Applied Geology for Major Engineering Projects. Springer International Publishing, pp. 465-468. https://doi.org/10.1007/978-3-319-09060-3_81

Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks. / Wieser, Carola; Käsling, Heiko; Raith, Manuel et al.
Engineering Geology for Society and Territory - Volume 6: Applied Geology for Major Engineering Projects. Springer International Publishing, 2015. p. 465-468.

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

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T1 - Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks

AU - Wieser, Carola

AU - Käsling, Heiko

AU - Raith, Manuel

AU - Richter, Ronald

AU - Moser, Dorothee

AU - Gemander, Franziska

AU - Grosse, Christian

AU - Thuro, Kurosch

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Excavation of deep andergroand 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 ander 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.

AB - Excavation of deep andergroand 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 ander 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.

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KW - Brittle rock

KW - Localization

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Acoustic emission technique to detect micro cracking during uniaxial compression of brittle rocks

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Keywords

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