TY - GEN
T1 - Rock stress assessment based on the fracture induced electromagnetic radiation
AU - Frid, V.
AU - Mulev, S. N.
N1 - Publisher Copyright:
© 2018 Taylor & Francis Group, London.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - An appearance of underground openings alters a stress field around them that sometimes provokes rock failure. Rock stress state is usually assessed at tunnel face or within boreholes using different types of electromechanical sensors that is laborious, expensive, and sometimes dangerous. Electromagnetic Radiation (EMR) caused by micro-fracturing is a non-destructive method of rock stress assessment. It is caused by the organized oscillation of charges on newly created surfaces in a frequency range kHz–MHz. Since the EMR in the MHz diapason appears much earlier than in the kHz range, it enables a short-term observation of failure transformation. The EMR parameters are related to the fracture length and width while its intensity is associated with rock elastic properties and stress state level. Despite of this comprehensive knowledge, quantitative unbiased criteria of stress assessment in the underground tunnels based on the EMR parameters are lacking yet. Here we consider several aspects related to the development of EMR quantitative criterion as follows: a. pre-calculation of the targeted EMR signal based on rock physical properties, b. regularity of the EMR attenuation based on the frequency of EMR signals, c. the symptoms of stress transformation from the steady to dangerous level.
AB - An appearance of underground openings alters a stress field around them that sometimes provokes rock failure. Rock stress state is usually assessed at tunnel face or within boreholes using different types of electromechanical sensors that is laborious, expensive, and sometimes dangerous. Electromagnetic Radiation (EMR) caused by micro-fracturing is a non-destructive method of rock stress assessment. It is caused by the organized oscillation of charges on newly created surfaces in a frequency range kHz–MHz. Since the EMR in the MHz diapason appears much earlier than in the kHz range, it enables a short-term observation of failure transformation. The EMR parameters are related to the fracture length and width while its intensity is associated with rock elastic properties and stress state level. Despite of this comprehensive knowledge, quantitative unbiased criteria of stress assessment in the underground tunnels based on the EMR parameters are lacking yet. Here we consider several aspects related to the development of EMR quantitative criterion as follows: a. pre-calculation of the targeted EMR signal based on rock physical properties, b. regularity of the EMR attenuation based on the frequency of EMR signals, c. the symptoms of stress transformation from the steady to dangerous level.
KW - Electromagnetic radiation
KW - Non-destructive methods
KW - Rock fracturing
KW - Rock stress assessment
UR - http://www.scopus.com/inward/record.url?scp=85063636203&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85063636203
SN - 9781138327481
T3 - Geomechanics and Geodynamics of Rock Masses - Selected Papers from the 2018 European Rock Mechanics Symposium, EUROCK 2018
SP - 303
EP - 309
BT - Geomechanics and Geodynamics of Rock Masses - Selected Papers from the 2018 European Rock Mechanics Symposium, EUROCK 2018
A2 - Litvinenko, Vladimir
PB - CRC Press/Balkema
T2 - European Rock Mechanics Symposium, EUROCK 2018
Y2 - 22 May 2018 through 26 May 2018
ER -