New Criteria to Assess Seismic and Rock Burst Hazard in Coal Mines / Nowe Kryteria Dla Oceny Zagrożenia Sejsmicznego I Tąpaniami W Kopalniach Węgla Kamiennego

Mutke, Grzegorz; Dubiński, J.; Lurka, Adam

doi:10.1515/amsc-2015-0049

Cited by 34 publications

(15 citation statements)

References 17 publications

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“…The PPV of coal and rock mass in the area with peak abutment pressure reached 1.47 m/s. According to previous studies (Mutke et al, 2009;Mutke et al, 2015;Wang et al, 2022), a PPV of about 1 m/s was enough to induce rock burst, which would cause severe deformation of the roadway or rock fall, thus, the rock burst hazard would be greatly increased. When the working face crossed through the fault, the influence degree of mining on the fault decreased, and the PPV of coal and rock mass in the area with peak abutment pressure decreased significantly to 0.14 m/s.…”

Section: Influence Of Fault Slip Dynamic Load On Vibration Velocity O...mentioning

confidence: 94%

Study on the dynamic response and the hazard of rock burst under the influence of fault slip

Kong

Liu²,

Xing³

et al. 2023

Front. Earth Sci.

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In the process of coal mine production, rock burst accidents near faults occur frequently. In order to further reveal the induced mechanism of fault slip rock burst, a numerical simulation method for dynamic calculation of fault slip under the influence of mining is proposed, and the law of fault slip and dynamic response characteristics of the stope are studied. The study shows that with the working face getting closer to the fault, the fault activity and the number of high-energy microseismic events increase significantly, and the fault slip dynamic load has a significant impact on the vibration velocity and abutment stress of coal and rock mass near the stope. Under the effect of a strong fault slip dynamic load, the coal and rock mass in the area with peak abutment stress undergo plastic failure and release a large amount of energy, and the potential of fault slip rock burst is high. The evaluation index Icd of rock burst hazard under fault slip dynamic load is proposed, and the rock burst hazard of working face passing through the fault is analyzed. The research results provide a theoretical basis for further revealing the induced mechanism and hazard assessment of fault slip rock bursts.

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Section: Influence Of Fault Slip Dynamic Load On Vibration Velocity O...mentioning

confidence: 94%

Study on the dynamic response and the hazard of rock burst under the influence of fault slip

Kong

Liu²,

Xing³

et al. 2023

Front. Earth Sci.

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“…Moreover, some other secondary hazards such as gas outbursts and roof falls will also occur together with the rock bursts, as reported and recorded at home and abroad [6,7]. With the increase of mining depth and intensity of coal mines, rock bursts become more frequent than that of ever before, such as in the USA [8], Australia [9,10], Poland [11,12], and China [13]. Particularly, more than 177 mines experienced rock burst incidents in China by the end of 2017 [13].…”

Section: Introductionmentioning

confidence: 94%

Modification of Coal Samples with Bursting Liability Subjected to Microwave Irradiation

Wen

Guan

Zhao

et al. 2021

Shock and Vibration

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This paper introduces the innovative technique to release the bursting liability of coal seam via microwave irradiation. To verify the feasibility of this environment-friendly technique, a series of laboratory tests incorporating acoustic emission (AE) investigation were carried out. Test results indicated that both the uniaxial compressive strength (UCS) and bursting energy index of raw and water-soaked coal samples were significantly reduced. In particular, the bursting liability was reduced by one level when the values of UCS were compared, the evidence of which is the variation of wave velocities of tested coal samples. It can also be found from the events and hits in the complete stress-strain curve and the cumulative curve of acoustic emission that the elastic modulus of the raw and water-soaked coal samples subjected to microwave irradiation decreased by 58.42% and 29.63%, respectively. This facilitates the entry into the stage of stable crack propagation more quickly, the growth rate and size of the cracks were slower and more uniform, and there were no smaller coal fragments ejecting during the failure process of the coal samples. Meanwhile, the proportion of high-energy events released in coal samples experienced a decline after the treatment of the microwave. Moreover, microwave heating principally promoted the initiation and expansion of microcracks in coal samples under the influence of microwave power of 1 kW and a heating time of 120s, which may cause the overall damage of large fractures to break into multiple small and medium cracks. Based on the experimental results, the conceptual process of using microwave in weakening the bursting liability of coal seam was then proposed, which will be the meaningful reference for microwave-assisted oil recovery and coal bed methane production.

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“…The first approach is based on the use of the well-established Gutenberg-Richter law which was applied in many pieces of research on seismic hazard in mines (e.g. Lasocki 1994;Lasocki 1995;Kornowski 2011a, 2011b;Convertito et al 2012;Mutke et al 2015;Leptokaropoulos et al 2017). The non-parametric hazard assessment approach is evaluated under certain conditions (e.g.…”

Section: Seismic Hazardmentioning

confidence: 99%

The influence of distant coal seam edges on seismic hazard during longwall mining

2020

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Underground coal seam mining has been carried out in the Upper Silesian Coal Basin, Poland, for many years and with a simultaneous increase in exploitation depth. Frequently, coal seams are not fully extracted due to numerous reasons which lead to their edges and remnants remaining in the rock mass. Even in the case of the full extraction of a coal seam, mining usually ends at the border of a protecting pillar to protect underground or surface objects, sometimes at the border of the mining area, or some distance from the old goaf or high throw fault. Extraction of subsequent coal seams in an analogous range results in a cluster of coal seam edges remaining. In the vicinity of the mentioned remainders, the disrupted stress distribution is expected. The infraction of the aforementioned equilibrium repeatedly results in the occurrence of strong mining tremors. The observations from the studied coal seam no. 408’s longwall panel indicated that mining works are able to disturb the present stress-strain equilibrium in the area of the edges of other coal seams, even if they are located at a greater vertical distance away. The seismological parameters and distributions have been applied for this purpose.

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New Criteria to Assess Seismic and Rock Burst Hazard in Coal Mines / Nowe Kryteria Dla Oceny Zagrożenia Sejsmicznego I Tąpaniami W Kopalniach Węgla Kamiennego

Cited by 34 publications

References 17 publications

Study on the dynamic response and the hazard of rock burst under the influence of fault slip

Study on the dynamic response and the hazard of rock burst under the influence of fault slip

Modification of Coal Samples with Bursting Liability Subjected to Microwave Irradiation

The influence of distant coal seam edges on seismic hazard during longwall mining

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