Transient electric signals prior to rock failure under uniaxial compression

1994 ◽  
Vol 21 (16) ◽  
pp. 1687-1690 ◽  
Author(s):  
V. Hadjicontis ◽  
C. Mavromatou
Keyword(s):  
Uniaxial Compression ◽  
Rock Failure ◽  
Electric Signals

scholarly journals Comparative analysis of acoustic and electromagnetic emissions of rocks

2021 ◽  
Vol 929 (1) ◽  
pp. 012013
Author(s):  
V N Klyuchkin ◽  
V A Novikov ◽  
V I Okunev ◽  
V A Zeigarnik
Keyword(s):  
Comparative Analysis ◽  
Uniaxial Compression ◽  
High Stress ◽  
Electromagnetic Emission ◽  
Rock Failure ◽  
Dynamic Rupture ◽  
Block Model ◽  
Rock Samples ◽  
Electromagnetic Emissions ◽  
Electromagnetic Signals

Abstract Comparative analysis of acoustic and electromagnetic emissions recorded during the intact rock samples deformation and dynamic rupture of simulated crustal fault is presented. Specialized machines for uniaxial compression and shear tests of rock samples with identical data acquisition systems for both test cases were employed. Increase of acoustic emission was observed accompanied by significant rise of intensity and amplitude of electromagnetic signals at high stress of the rock samples under the uniaxial compression or dynamic failure in the spring-block model. Such correlation is consistent with the previous conclusions that an increase of electromagnetic emission may be considered as a rock failure precursor. Any specific characteristics of the detected electromagnetic signals to be used for prediction of impending rock failure or the earthquake fault rupture were not found. The similarity of electromagnetic signals and their spectra obtained at the press equipment and the spring-block model suggests that in both cases, the signals observed are generated by the crack formations and shear. The electromagnetic emission appeared only in dry samples. The samples saturated by water with the salinity of over 0.1% demonstrated no electromagnetic emission.

scholarly journals Distinct Element Analysis for Rock Failure under Uniaxial Compression

2009 ◽  
Vol 125 (3) ◽  
pp. 91-97 ◽  
Author(s):  
Hiroyuki SHIMIZU ◽  
Sumihiko MURATA ◽  
Tsuyoshi ISHIDA
Keyword(s):  
Uniaxial Compression ◽  
Distinct Element ◽  
Rock Failure ◽  
Element Analysis

scholarly journals Study on acoustic–electric–heat effect of coal and rock failure processes under uniaxial compression

2017 ◽  
Vol 15 (1) ◽  
pp. 71-80 ◽  
Author(s):  
Zhong-Hui Li ◽  
Quan Lou ◽  
En-Yuan Wang ◽  
Shuai-Jie Liu ◽  
Yue Niu
Keyword(s):  
Uniaxial Compression ◽  
Heat Effect ◽  
Rock Failure ◽  
Electric Heat

Numerical Study of Effect of Joint Tip Distance from Sample End on Rock Failure

2014 ◽  
Vol 501-504 ◽  
pp. 244-247
Author(s):  
Yun Jie Zhang ◽  
Cheng Fan
Keyword(s):  
Uniaxial Compression ◽  
Numerical Study ◽  
Process Analysis ◽  
Rock Fracture ◽  
Failure Process ◽  
Strain Curve ◽  
Peak Stress ◽  
Rock Failure ◽  
Peak Strain ◽  
Failure Patterns

In this paper,the mechanical properties of rock experiencing the variation of joint tip distance from sample end under uniaxial compression condition were simulated.Numerical simulation for the different rock sample in the uniaxial compression have been conducted to evaluate the effects of joint tip distance from sample end on the overall mechanical behaviour of jointed rock masses. It was done using the Rock Failure Process Analysis program RFPA2D. Numerically simulated stress-strain curve, peak stress, peak strain and failure patterns were compared with the corresponding physical tests. We found that specimen joint tip distance from sample end corresponding value (distance from the crack tip to the compression surface) linear relationship with the compressive strength values .Numerical simulations agree well with physical results, it is shown that RFPA2D is suitable for the analysis of joint tip distance from sample end effect on rock fracture.

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