Formation of electromagnetic radiation in coal stratum

Frid, Vladimir; Shabarov, A. N.; Proskuryakov, V. M.; Baranov, V. A.

doi:10.1007/bf00710732

Cited by 29 publications

(6 citation statements)

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“…Considering that coal or rock structure is non-uniform, micro-element strength distribution is random, formula (15) can be multiplied by a stochastic number between [0,1], its value is assigned by the computer, and then, formula (15) can be rewritten as:…”

Section: Producing Mechanism Of Emementioning

confidence: 99%

Electro‐Mechanical Coupling Laws for EME Memory Effect During Deformation and Fracture of Coal or Rock

Wang

2006

Chinese J of Geophysics

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We have analyzed the relations between electromagnetic emission (EME) pulse numbers and damage parameter and discussed the EME producing mechanism and electro‐mechanical coupling laws of EME memory effect during deformation and fracture of coal or rock, established the EME memory effect electro‐mechanical coupling model of coal or rock containing gas deformation and fracture under conditions of constant confining pressure and triaxial compression, tested and analyzed the EME memory effect electro‐mechanical coupling law of coal or rock containing gas under condition of uniaxial compression. The results show that the EME memory effect electro‐mechanical coupling model of coal or rock containing gas primely reflects the characteristic laws and microcosmic damage mechanism of EME memory effect during deformation and fracture of coal or rock.

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Section: Producing Mechanism Of Emementioning

confidence: 99%

Electro‐Mechanical Coupling Laws for EME Memory Effect During Deformation and Fracture of Coal or Rock

Wang

2006

Chinese J of Geophysics

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“…Altogether, we have carried out EMR investigations in more than 400 dierent rock-gas outburst conditions in underground coal mines (North Kuzbass deposit) (FRID, 1990(FRID, , 1997aFRID et al, 1992). Our investigations indicate that an increase of rockburst hazard, accompanied by an increase of EMR activity, occurs when pillars are found above mine working, where geological faults exist in the area, and/ or where seam thickness sharply diminishes (FRID, 1997b).…”

Section: An Example Of Emr Measurements In Coal Minesmentioning

confidence: 99%

Calculation of Electromagnetic Radiation Criterion for Rockburst Hazard Forecast in Coal Mines

Frid¹

2001

Pure appl. geophys.

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Ð Intensive micro-fracturing of rock close to mining operations accompanies an increase in the likelihood of rockbursting. This fracturing causes an increase of the electromagnetic radiation (EMR) level by up two orders of magnitude, depending on the mining environment. Several examples of this enhanced EMR are presented in this paper. We ®rst treat the EMR theoretical criterion of rockburst hazard in coal mines and compare it with the empirical criterion of EMR activity that was revealed on the basis of more than 400 dierent hazardous and non-hazardous situations in underground coal mines. Only the following parameters are needed to estimate the EMR criterion of rockburst hazard: limiting value of gum volume, mine working width, coal seam thickness, and coal elastic properties.

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“…In recent years, with the constant increase of depth and intensity of coal mining, mining-induced strata behavior is becoming increasingly intense in horizontal slices of extrathick steeply inclined coal seams, and many coal burst accidents even occurred [5,6]. As a typical dynamic disaster in coal mines, coal burst refers to the sudden failure of coal and rock mass in the mining space and the release of a large amount of energy, producing forces that throw coal and rock into the free space, which seriously threatens the safety of personnel and property in coal mines [7][8][9][10]. On July 2, 2013, a coal burst accident happened in the B3 + 6 working face of Wudong Coal Mine in Xinjiang Uygur Autonomous Region, resulting in roadway floor heaving of 200∼450 mm within 100 m ahead of the working face.…”

Section: Introductionmentioning

confidence: 99%

Study on Roof Breakage‐Induced Roadway Coal Burst in an Extrathick Steeply Inclined Coal Seam

Wang

Cao

et al. 2019

Shock and Vibration

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In view of the coal burst induced by roof breakage in the steeply inclined coal seam (SICS) roadway and its mechanism, a mechanical model was established to investigate the distribution of dynamic and static stresses in the coal seam before and after the breakage of a thick hard roof. The aim of this research is to study failure laws of SICS roadways under the superposition of dynamic load induced by roof breakage and asymmetric static load. For this purpose, response characteristics including acoustic emission (AE), static stress, and acceleration were analyzed by applying different dynamic loads to different horizontal slices with a self-made similarity simulation test apparatus under combined dynamic and static loads. The theoretical model and simulation results were verified by analyzing characteristics of coal burst occurrence in the field, microseismic (MS) events, and tomographic imaging of microseismic waves. The study demonstrates the following: (1) The abutment pressure of the roof plays a dominant role in stress distribution of the coal seam slice before the breakage of the thick hard roof with the stress of the roof roadway (Rr) being obviously higher than that of the floor roadway (Rf). (2) High-energy MS events and AE events are concentrated on the roof side after the breakage of the thick hard roof, and coal bursts are more easily induced by the superposition of high dynamic and static stresses on the roof side. Coal burst in the roadway is jointly determined by dynamic and static stresses. Under the same static stress, response characteristics increase with the rise of intensity of dynamic loads. When dynamic stress is the same, coal burst easily occurs in the roadway with high static stress.

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Formation of electromagnetic radiation in coal stratum

Cited by 29 publications

References 0 publications

Electro‐Mechanical Coupling Laws for EME Memory Effect During Deformation and Fracture of Coal or Rock

Electro‐Mechanical Coupling Laws for EME Memory Effect During Deformation and Fracture of Coal or Rock

Calculation of Electromagnetic Radiation Criterion for Rockburst Hazard Forecast in Coal Mines

Study on Roof Breakage‐Induced Roadway Coal Burst in an Extrathick Steeply Inclined Coal Seam

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