Statistical study of acoustic emissions generated during the controlled deformation of migmatite specimens

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00480961" target="_blank" >RIV/67985831:_____/17:00480961 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/17:10369666

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijrmms.2017.10.011" target="_blank" >http://dx.doi.org/10.1016/j.ijrmms.2017.10.011</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijrmms.2017.10.011" target="_blank" >10.1016/j.ijrmms.2017.10.011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Statistical study of acoustic emissions generated during the controlled deformation of migmatite specimens

Popis výsledku v původním jazyce

Acoustic emissions generated during the mechanical loading of rocks provide information about the process of their fracturing and therefore have been used in the research of rock fracturing for many years. Laboratorynloading experiments are used as a model of seismic processes in the field. Continuous loading is typically used tonmodel natural tectonic processes, whereas stepwise loading can represent local stress field changes and evolution, similar to some features of rock fracturing due to water injection in the borehole with step-like injection history. During continuously increasing loading, acoustic impulses of a swarm character are generated. During stepped stress, however, the emission of acoustic signals generated has the character of an aftershock series and can be described by Omori's law for aftershock decay. The present work focuses on a detailed analysis of the seismoacoustic emissions generated in rock specimen during the stepwise increasing deformation during laboratory loading tests. A cylindrical specimen of migmatite was subjected to cyclical and stepwise loading with controlled deformation. The stepwise deformation increase was approximately 0.8 mStrain per one step and deformation rate was cca 8 mStrain/s. This sudden increase of deformation was accompanied by peak stress increase with duration of approximately 2 s. During load testing, seismoacoustic emissions were monitored and time series of acoustic impulses were recorded. It was found that the higher the level of stress, the longer the duration of aftershock sequence. Analysis of the autocorrelation functions of individual sequences showed significant changes in parameters at maximum specimen stress. An increase was found in the values of first autocorrelation coefficients, which can be used to assess the stability of the rock specimen.

Název v anglickém jazyce

Statistical study of acoustic emissions generated during the controlled deformation of migmatite specimens

Popis výsledku anglicky

Acoustic emissions generated during the mechanical loading of rocks provide information about the process of their fracturing and therefore have been used in the research of rock fracturing for many years. Laboratorynloading experiments are used as a model of seismic processes in the field. Continuous loading is typically used tonmodel natural tectonic processes, whereas stepwise loading can represent local stress field changes and evolution, similar to some features of rock fracturing due to water injection in the borehole with step-like injection history. During continuously increasing loading, acoustic impulses of a swarm character are generated. During stepped stress, however, the emission of acoustic signals generated has the character of an aftershock series and can be described by Omori's law for aftershock decay. The present work focuses on a detailed analysis of the seismoacoustic emissions generated in rock specimen during the stepwise increasing deformation during laboratory loading tests. A cylindrical specimen of migmatite was subjected to cyclical and stepwise loading with controlled deformation. The stepwise deformation increase was approximately 0.8 mStrain per one step and deformation rate was cca 8 mStrain/s. This sudden increase of deformation was accompanied by peak stress increase with duration of approximately 2 s. During load testing, seismoacoustic emissions were monitored and time series of acoustic impulses were recorded. It was found that the higher the level of stress, the longer the duration of aftershock sequence. Analysis of the autocorrelation functions of individual sequences showed significant changes in parameters at maximum specimen stress. An increase was found in the values of first autocorrelation coefficients, which can be used to assess the stability of the rock specimen.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Rock Mechanics and Mining Sciences

ISSN

1365-1609

e-ISSN

—

Svazek periodika

100

Číslo periodika v rámci svazku

December 2017

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

83-89

Kód UT WoS článku

000418009400009

EID výsledku v databázi Scopus

2-s2.0-85033680778