Influence of Mining Operating Conditions on Fault Behavior

Burtan, Zbigniew; Zorychta, A.; Cieślik, Jerzy; Chlebowski, Dariusz

doi:10.2478/amsc-2014-0048

Cited by 13 publications

(10 citation statements)

References 1 publication

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“…The seismic threat in Polish hard coal mines is associated with many factors of natural and mining origin [1][2][3][4][5][6]. One of the basic ones is stress concentration in coal seams which occurs in particular as a result of the impact of the edges and remnants of adjacent coal seams [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the results of the seismic profiling and WAS-96/RMS seismoacoustic active method in an assessment of the impact of the overlying coal seam edge

Olechowski¹,

Krawiec

Kokowski

et al. 2018

E3S Web Conf.

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In the study, a comparison between the results of seismic profiling and the active seismoacoustic method WAS-96/RMS has been presented. The methods were used to assess the impact of an overlying coal seam edge on the relative stress state of the test heading in the chosen hard coal mine in the Upper Silesian Coal Basin, Poland. The work presents the methodologies of measurement, processing and interpretation of both methods. In the research area there were two edges of the adjacent seams at vertical distances of 70 and 100 m. The obtained results allowed for the development of conclusions regarding the effectiveness of both methods. It was stated, that the seismic profiling method, as well as the WAS-96/RMS method allowed for the identification of anomalies in the area of impact of the overlying coal seams. Based on previous experience, a comparison of the advantages and limitations of the seismic profiling and the WAS- 96/RMS method has also been presented. As a result, it was found that seismic profiling should be the basic method for assessing the impact of the edges and remnants of exploited seams, whereas the WAS-96/RMS method may be used as a complementary method if a confirmation of the rockbursts threat is required.

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Section: Introductionmentioning

confidence: 99%

Comparison of the results of the seismic profiling and WAS-96/RMS seismoacoustic active method in an assessment of the impact of the overlying coal seam edge

Olechowski¹,

Krawiec

Kokowski

et al. 2018

E3S Web Conf.

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“…3a), roof falls occurring in the roof void, weak rock layers and existing veins causing the stratification of rocks and their fall down. Interlayers tend to be washed away by water present in the roofs, which weakens roof stability, as well as numerous disturbances among which faults are particularly significant [5], [2]. First of all, one should take into account the natural hazards associated with the occurrence of the dynamic phenomena that directly destroy the structure of rocks and rock layers, cause roof watering leading to the leaching of some of the weaker strata as well as the corrosion of bolt supports.…”

Section: Introductionmentioning

confidence: 99%

Application of Long Expansion Rock Bolt Support in the Underground Mines of Legnica–Głogów Copper District

Skrzypkowski

Korzeniowski

Zagórski

et al. 2017

Studia Geotechnica Et Mechanica

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Abstract:In the underground mines of the Legnica-Głogów Copper District (LGOM) the main way to protect the room excavation is the use of a rock bolt support. For many years, it has proven to be an efficient security measure in excavations which met all safety standards and requirements. The article presents the consumption of the rock bolt support in the Mining Department "PolkowiceSieroszowice" in the years 2010-2015 as well as the number of bolt supports that were used to secure the excavations. In addition, it shows the percentage of bolt supports that were used to conduct rebuilding work and cover the surface of exposed roofs. One of the factors contributing to the loss of the functionality of bolt supports is corrosion whose occurrence may lead directly to a reduction in the diameter of rock bolt support parts, in particular rods, bearing plates and nuts. The phenomenon of the corrosion of the bolt support and its elements in underground mining is an extremely common phenomenon due to the favorable conditions for its development in mines, namely high temperature and humidity, as well as the presence of highly aggressive water. This involves primarily a decrease in the capacity of bolt support construction, which entails the need for its strengthening, and often the need to perform the reconstruction of the excavation.The article presents an alternative for steel bearing plates, namely plates made using the spatial 3D printing technology. Prototype bearing plates were printed on a 3D printer Formiga P100 using the "Precymit" material. The used printing technology was SLS (Selective Laser Sintering), which is one of the most widely used technologies among all the methods of 3D printing for the short series production of the technical parts of the final product.The article presents the stress-strain characteristic of the long expansion connected rock bolt support OB25 with a length of 3.65 m. A rock bolt support longer than 2.6 m is an additional bolt support in excavations, and it is increasingly frequently used to reinforce roofs and in rebuilding the underground mines of KGHM Polish Copper S.A. In order to conduct the laboratory tests that are most suitable for the mine conditions, and yet are carried out on a laboratory test facility, the Authors used a steel cylinder with an external diameter of 102 mm and a length of 600 mm, which was filled with a core of rock (dolomite) from the roofs of the mine workings.In addition the maximum load that took over the bolt support made of rods and connected with sleeves was determined. For the initial tension, the elastic and plastic range of the maximal displacements, which were measured by the rope encoder, were determined. The statical tests of the expansion rock bolt support were carried out at the laboratory of the Department of Underground Unauthenticated Download Date | 5/12/18 3:35 PM K. SKRZYPKOWSKI et al. 48 Mining in simulated mine conditions. The test facility enables the study of the long bolt rods on a geometric scale of 1:1 for the different ways of...

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“…Such hazards include various edges and remnants of already-exploited coal seams, which create excessive concentrations of stress in the rock mass and a simultaneously unfavourable impact on mining excavations [5][6]. Mining also causes the activation of faults, which creates concentrations of excessive stress [7][8]. The magnitude and extent of the impact of the unexploited edges and remnants of coal seams and activated faults can be measured using the seismic profiling method [3,9].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the impact of an overlying coal seam edge using seismic profiling of refracted Pwave velocity

Szreder

Barnaś

2017

E3S Web of Conferences

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This paper presents the results of seismic profiling along the sidewalls of two headings of a longwall in a coal-seam at a depth of about 850 and 870 metres in a coal mine in the Upper Silesian Coal Basin, Poland. The seismic profiles were located in a zone of impact of the same overlying edge of the coal-seam located about 40 m above. This study was interesting from that point of view since there were no other geological and mining factors present which could disturb the impact of the coal seam edge. The profiling of refracted P-wave velocity changes was carried out according to the Dubinski method. This method is used for the assessment of relative stress in a coal seam in the side wall of the excavation. The results obtained on both seismic profiles are very similar, which demonstrates the small impact of the overlying edge of the coal seam in both headings of a longwall. It should be emphasised that at greater exploitation depths, the calculated reference velocity is less reliable than the measured reference velocity. Presumably, the method of calculating seismic anomaly requires updating under such conditions, but additional evidence should be collected.

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Influence of Mining Operating Conditions on Fault Behavior

Cited by 13 publications

References 1 publication

Comparison of the results of the seismic profiling and WAS-96/RMS seismoacoustic active method in an assessment of the impact of the overlying coal seam edge

Comparison of the results of the seismic profiling and WAS-96/RMS seismoacoustic active method in an assessment of the impact of the overlying coal seam edge

Application of Long Expansion Rock Bolt Support in the Underground Mines of Legnica–Głogów Copper District

Assessment of the impact of an overlying coal seam edge using seismic profiling of refracted Pwave velocity

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