Assessment of Powered Support Loadings in Plow and Shearer Longwalls in Regard to the Pressure Measurements in Props

Płonka, M.; Rajwa, S.

doi:10.1201/b11749-25

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…It is extremely difficult to measure the actual increased levels of load impacting on the powered roof support during in situ tremors due to the specific nature of the structure, the method of installation in the excavation and the characteristics of operation. Currently used automatic measurement systems, mainly focused on pressure measurements in under piston space of legs, due to the frequency of measurements, cannot directly record effects of dynamic events (Płonka & Rajwa, 2011;Prusek et al, 2016). Szweda (2003Szweda ( , 2004 presented the results of dynamic load measurements using strain gauges placed on the mechanical extension of the hydraulic leg.…”

Section: Evaluation Of the Influence Of Dynamic Phenomena On A Powere...mentioning

confidence: 99%

Archives of Mining Sciences

Masny

2020

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Tremors occur randomly in terms of time, energy as well as the location of their focus. The present state of knowledge and technology does not allow for the precise prediction of these values. Therefore, it is extremely important to correctly select a powered roof support for specific geological and mining conditions, especially in the case of areas where dynamic phenomena are often registered. This article presents information on rock burst hazard associated with the occurrence of rock mass tremors and their influence on a powered roof support. Furthermore, protection methods of a powered roof support against the negative effects of dynamic phenomena are discussed. As a result of an analysis the methodology, to determine the impact of dynamic phenomena on the powered roof support in given geological and mining conditions is presented.

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Section: Evaluation Of the Influence Of Dynamic Phenomena On A Powere...mentioning

confidence: 99%

Archives of Mining Sciences

Masny

2020

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“…The change of support parameters as a result of maintaining poor work geometry is shown in Table 2 [6,7].…”

Section: Analysis Of the Causes Of Damage In The Leg's Control Systemmentioning

confidence: 99%

Case Analysis of Damages to Control Hydraulics of the Leg in the Powered Roof Support Section

Świątek

Stoiński

2019

E3S Web Conf.

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The article discusses a case of security hazard in a longwall equipped with a properly selected chock shield support with two legs, technically efficient, introduced to the market and for operation in compliance with the requirements covering Polish hard coal mining. As a cause of the hazard an accidental coincidence was indicated, such as the occurrence of a tremor at an area with unfavourable geometry for the operation of the support section and leg (including the shift of the double-telescopic leg from the 1st to the 2nd hydraulic stage) at the time of the mining process. Immediate safety measures were applied successfully. They were aimed at minimizing the conditions dangerous to the crew. The section was withdrawn and spragged again. As a result, the leg operated in full extension mode of the 1st hydraulic stage, obtaining the required strength and geometry of the section and leg. The presented case study will be additionally supplemented in the future with selected analytical and bench tests.

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“…CMI's employees conduct various types of underground tests and observations aimed at assessing the stability of the roof in longwall [16,17]. In recent years, there have been a few hundred analyses concerning the selection of shields for the specific conditions of mining operations in hard coal mines in Poland.…”

Section: Factors Influencing Increase In Roof Fall Risk In Longwallmentioning

confidence: 99%

Assessment of roof fall risk in longwall coal mines

Prusek

Rajwa

Wrana

et al. 2016

International Journal of Mining, Reclamation and Environment

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Based on extensive experience in shield support design and the results of underground measurements and observations, the major factors influencing the stability of the roof in retreat longwall panels were determined. A practical method for assessing the risk of roof falls is presented. It is a combination of empirical methods and expert techniques that enable investigators to determine the probability and potential consequences of roof falls. This report includes an example of applying the method to one longwall panel. The method is a practical decision tool to support the mining management when planning the roof fall preventive measures.

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Assessment of Powered Support Loadings in Plow and Shearer Longwalls in Regard to the Pressure Measurements in Props

Cited by 5 publications

References 2 publications

Archives of Mining Sciences

Archives of Mining Sciences

Case Analysis of Damages to Control Hydraulics of the Leg in the Powered Roof Support Section

Assessment of roof fall risk in longwall coal mines

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