Estimate of Crack Formation in Gypsiferous Rock Mass by the Method of Electromagnetic Radiation Recording

Вознесенский, А. С.; Набатов, В. В.

doi:10.1023/b:jomi.0000013779.49922.fb

Cited by 5 publications

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“…A large‐scale analogue of the electromagnetic emission in loaded rock specimens, is electromagnetic radiation measured in underground mines [28–32] and prior to large earthquakes in the Earth's crust [33, 34].…”

Section: Fracture‐induced Physical Phenomena In Rocksmentioning

confidence: 99%

Fracture‐induced Physical Phenomena and Memory Effects in Rocks: A Review

Lavrov

2005

Strain

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Losing stability, the earth split; Losing strength, the mountains sank. Tao De Ching Abstract: Fracture‐induced physical phenomena allow a real‐time monitoring of damage evolution in rocks induced by mechanical loading. Some of these phenomena, e.g. plastic deformation, changes in permeability and electric resistivity, provide an overall estimate of damage as a function of stress. Others, such as acoustic emission or electromagnetic emission, allow an exact location of cracks in space and time. Being nondestructive, monitoring techniques based on fracture‐induced physical phenomena, are a basis for prediction of earthquakes and rockbursts in underground mines. They are also crucial for a fundamental understanding of rock fracture mechanisms and for developing constitutive models of rock behaviour. Memory effects take place in rocks subjected to cyclic loading with the peak stress (strain) value increasing from cycle to cycle. The effects are represented by certain characteristic changes in rock properties and parameters that are observed when the stress (strain) reaches its previous peak value. Potential applications of memory effects range from stress measurement techniques to earthquake prediction to damage surface scanning. Essential experimental and theoretical results on fracture‐induced physical phenomena and memory effects in rocks are considered in the article. Possible applications as well as not‐yet‐clear points are discussed.

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Section: Fracture‐induced Physical Phenomena In Rocksmentioning

confidence: 99%

Fracture‐induced Physical Phenomena and Memory Effects in Rocks: A Review

Lavrov

2005

Strain

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“…The current methods are based on using the mentioned effects, which appear under changes in the state of geomaterials and allow the information of them to be found [6][7][8][9][10][11].…”

mentioning

confidence: 99%

Features of thermomechanical effects in rock salt samples under uniaxial compression

Шейнин

Blokhin

2012

J Min Sci

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The article describes the uniaxial compression tests on rock salt samples under monotonic loading, which were carried out with the synchronous record of changes in thermal radiation and mechanical parameters. A relationship between the nonlinear deformation stages and the features of thermomechanical processes is found. The rate of change in rock stress state is shown to affect the information value of variations in the attendant infrared radiation. The experimental results point out the possibility of using the method in monitoring of the real geomechanical objects.The deformation and failure processes in solids, including geomaterials, are accompanied by the wide electromagnetic spectrum: from radio-wave pulses [1, 2] and infrared radiation [3, 4] to luminescent flashes [5]. The current methods are based on using the mentioned effects, which appear under changes in the state of geomaterials and allow the information of them to be found [6][7][8][9][10][11].To diagnose the stress state of different materials for both research and technological purposes, two well-known thermodynamic effects are applied. They involve the change in temperature of a solid upon varying the first invariant of stress tensor [3,12] and the relationship between the intensity of infrared radiation from a solid surface and the temperature [3,13]. As previously shown [8-10], such approach can become effective for the contactless measurements of elastic stresses in geomaterials.The purpose of the present paper is to consider the possibility for identifying the deformation processes in geomaterials under the wider range of conditions, namely, under the stresses coming to the elastic and ultimate strengths, by measuring the thermal radiation.The experimental stand is shown in Fig. 1. All tests were carried out with the Instron 150LX press, which allows implementing the "hard" and "soft" modes of uniaxial loading and provides the automated and synchronous registration of changes in the mechanical parameters and the corresponding variations in infrared radiation intensity.As in [8-10], RTN-31 is used as the primary infrared radiation detector [14] meant for the contactless measurement of optical radiation intensity in the infrared spectrum of wave lengths. IR radiation detector 1 is fixed approximately at the center of sample 2 at a distance of 0.5-1 cm from its surface. M70P-S3 strain-gage 5 for measuring the changes in the force exerted on a sample is placed between plate 3 and base plate 4. Contrary to bench in [9, 10], the gauging stand includes longitudinal strain indicator 6 embedded into the loading press and located between plate 4 and the moving beam of the press. This gage allows one to obtain the relationships between the longitudinal stress 1 σ and longitudinal strain 1 ε , as well as to define the boundaries between the process stages and test the transitions by using the thermal radiation data.

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Monitoring dynamic rock pressure events using improved EME recording instrumentation

Bizyaev

Yakovitskaya

2015

J Min Sci

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Estimate of Crack Formation in Gypsiferous Rock Mass by the Method of Electromagnetic Radiation Recording

Cited by 5 publications

References 0 publications

Fracture‐induced Physical Phenomena and Memory Effects in Rocks: A Review

Fracture‐induced Physical Phenomena and Memory Effects in Rocks: A Review

Features of thermomechanical effects in rock salt samples under uniaxial compression

Monitoring dynamic rock pressure events using improved EME recording instrumentation

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