Acoustic Emission Technique to Detect Micro Cracking During Uniaxial Compression of Brittle Rocks

Wieser, Carola; Käsling, Heiko; Raith, Manuel; Richter, R.; Moser, Dorothee; Gemander, Franziska; Große, Christian U.; Thuro, Kurosch

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

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…The detection of precursors of mine-subsidence-induced micro seismicity are of great interest to the research community: Acoustic emission techniques [144][145][146], infrared thermography [151], laser scanning [152] and the SAR (synthetic aperture radar) techniques [153][154][155][156][157][158] have been utilized to study the precursors of rock failure. SAR techniques, in particular, may have the most potential to assess the performance of partial extraction mines, because they can provide accurate, cumulative regional displacements of ground surface.…”

Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

“…For example, the expansion of discontinuous planes induced by dissolution results in the volume expansion of partings in pillars and may lead to a low-stress failure. Studies of fracture mechanics and damage mechanics must be coupled with field measurements using non-destructive testing (NDT) technologies, such as acoustic emission [144][145][146] and CT (Computed Tomography) scans [147,148], which can be used to investigate failure during continuous loading.…”

Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

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Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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Abstract:Partial extraction methods such as underground strip pillar mining or room-and-pillar mining are widely adopted techniques to control ground subsidence. However, pillar failure in partial extraction mines may introduce violent secondary ground collapses. The stability of partial extraction mines dictates the safety of ground surface structures and the environmental health state of the surrounding mining areas. To reuse mining subsidence lands, it is necessary to evaluate the stability of the land through mine subsidence assessments. This paper summarizes current pillar stability assessment methods and their limitations, and the rock mechanics associated with the stability of abandoned mines. The effects of multiple factors that affect mine stability are discussed in detail; special attention has been extended to discuss the weathering effects associated with infused water and spontaneous combustion, as these are some key reasons for pillar strength degradation in abandoned mines. The mechanism of mine collapse and the corresponding post-mining disasters are also summarized. Finally, suggestions and strategies to improve current mine stability assessment methods are proposed based on the perspective of subsidence control.

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Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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“…This has been studied in the Ph.D. project of Carola Wieser, where the focus is on stress-induced micro cracking and its influence on deformation behaviour and its strength. In [16] results from acoustic emission (AE) measurements on homogeneous diorite samples tested under uniaxial compression have been introduced. The aim was to gain information about the influence of experimental setup (Fig.…”

Section: Primary Stress Conditionsmentioning

confidence: 99%

“…4. Left: 14 piezoelectric transducers attached to diorite specimen, Right: pre-amplification and data acquisition system connected to the rock (from [16], Fig. 1) Bild 4.…”

Section: Time-dependent Behaviour During Stress Relaxationmentioning

confidence: 99%

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Hard rock TBM Tunnelling – on the way to a better prognosis? / TBM‐Hartgesteinsvortriebe: Auf dem Weg zu einer verbesserten Prognose?

Thuro

Wilfing

Wieser

et al. 2015

Geomechanics and Tunnelling

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Five universities from Austria, Germany and Switzerland, working intensively together with partners from the industry, client organisations, companies, consultants and TBM manufacturers, have combined to develop a new prognosis model for TBM advance rate and disc wear (the "ALPINE MODEL"). This article presents some new results from the project. Fundamentally, the new model is to be a development of the model from Gehring, which calculates the penetration from the ratio of disc load to uniaxial compression strength. Since this equation was derived from data collected from a limited number of projects in the 1980s, it is of great importance to widen the data base and to establish a standardised process for this purpose. For on-site tests, the "Start-stoppenetration test" is considered the most efficient and suitable method. This test can be carried out with the TBM in the course of tunnelling and thus results in little delay. In addition to the recording of TBM data during the penetration test, detailed geological documentation of the face and the tunnel sides has to be undertaken, accompanied by geomechanical laboratory tests. A large number of such penetration tests have now been carried out on various tunnel projects in order to validate and improve the basic formula. Some of the first results are described in this article. Further themes include the rock mechanical parameters to be used, the influence of the primary stress conditions at the face and the abrasiveness of the rock. Fünf Universitäten aus Österreich, Deutschland und der Schweiz, die intensive mit Partnern aus der Wirtschaft, Bauherren, Firmen, Ingenieurbüros und TBM Herstellern zusammenarbeiten, entwickeln gemeinsam ein neues Prognosemodell für die TBM Vortriebsleistung und den Rollenmeißel-Verschleiß (das "ALPINE MODEL"). In diesem Artikel werden einige neue Ergebnisse dazu vorgestellt. Grundsätzlich soll das neue Modell wie das zugrunde liegende Modell von Gehring aufgebaut sein, dessen Basis aus der Berechnung der Penetration durch das Verhältnis von Diskenlast und Einaxialer Druckfestigkeit besteht. Nachdem diese Beziehung aus Daten abgeleitet ist, die in 1980er-Jahren aus einer beschränkten Anzahl von Projekten gesammelt wurden, ist es von unmittelbarer Bedeutung, diese Datenbasis auszuweiten und dafür ein Standardverfahren zu etablieren. Für Vor-Ort-Versuche wird der sog. "Start-Stop-Penetrationsversuch" als effizienteste und geeignetste Methode angesehen. Dieser Versuch kann mit der TBM während des Vortriebs durchgeführt werden und führt daher nur zu sehr geringen Vortriebsverzögerungen. Neben der Aufzeichnung der TBM Vortriebsdaten während des Penetrationsversuchs muss eine detaillierte geologische Dokumentation der Ortsbrust und der Laibung sowie felsmechanische Laboruntersuchungen der Gesteine vorgenommen werden. Eine große Anzahl von solchen Penetrationsversuchen wurde bei unterschiedlichen Tunnelprojekten durchgeführt, um die Basis-Formel zu validieren bzw. zu verbessern. Einige erste Ergebnisse werden in diesem Artikel vorgestellt. An...

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Acoustic emission characteristics of the rock-like material containing a single flaw under different compressive loading rates

Zhang

2017

Computers and Geotechnics

174

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Acoustic Emission Technique to Detect Micro Cracking During Uniaxial Compression of Brittle Rocks

Cited by 9 publications

References 9 publications

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Hard rock TBM Tunnelling – on the way to a better prognosis? / TBM‐Hartgesteinsvortriebe: Auf dem Weg zu einer verbesserten Prognose?

Acoustic emission characteristics of the rock-like material containing a single flaw under different compressive loading rates

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