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Analysis of the Influence of Dynamic Load on the Work Parameters of a Powered Roof Support’s Hydraulic Leg

Author

Listed:
  • Dawid Szurgacz

    (Center of Hydraulics DOH Ltd., 41-906 Bytom, Poland)

  • Jarosław Brodny

    (Faculty of Organization and Management, Silesian University of Technology, 44-100 Gliwice, Poland)

Abstract

One of the basic tasks of powered roof support is to protect the longwall excavation against deformation of the rock mass during the underground exploitation of hard coal. The behavior of the rock mass during mining is difficult to predict. Therefore, the loads acting on the support are diverse in terms of nature, direction and force. The dynamic load resulting from rock bursts, relaxation and tremors may lead to particularly dangerous consequences involving the functionality of the workings and the safety of the crew. The powered roof support will function properly only if the elements dynamically loaded are under control at the moment of impact. The article presents the results of tests of the basic powered roof support’s element − a hydraulic leg impacted by dynamic load. The source of the load was a free falling impact mass dropped from a certain height. The tests covered the actual hydraulic leg with all hydraulic equipment used in the powered roof support. During the tests, the original measurement-recording system developed by the authors was used, in which, among others, a high-speed dynamic camera was used to record movements of the leg’s elements. The original research methodology developed together with the measurement system enabled the registration of many parameters of the leg’s work under dynamic load. In particular, this applies to time series of pressure in the leg and the value of its withdrawal depending on the energy of the impact. The individual phases of the leg’s work were also registered, including the opening and closing of the safety valve protecting the leg against overloading. The obtained results broaden knowledge in the field of hydraulic legs used in the mining support under dynamic load. At the same time, they are a valuable source of information for mine maintenance services and should be applied to the design process, selection and operation of a powered roof support in dynamic conditions. The subject of the article fits in with the philosophy of sustainable development, especially in the field of full use of options of the support and ensuring safe and environmentally friendly mining processes.

Suggested Citation

  • Dawid Szurgacz & Jarosław Brodny, 2019. "Analysis of the Influence of Dynamic Load on the Work Parameters of a Powered Roof Support’s Hydraulic Leg," Sustainability, MDPI, vol. 11(9), pages 1-13, May.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:9:p:2570-:d:228148
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    References listed on IDEAS

    as
    1. Wei-bin Guo & Hong-sheng Wang & Guo-wei Dong & Lei Li & Yao-guang Huang, 2017. "A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions," Sustainability, MDPI, vol. 9(6), pages 1-17, June.
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    Cited by:

    1. Dawid Szurgacz, 2021. "Dynamic Analysis for the Hydraulic Leg Power of a Powered Roof Support," Energies, MDPI, vol. 14(18), pages 1-12, September.
    2. Dawid Szurgacz & Jarosław Brodny, 2020. "Adapting the Powered Roof Support to Diverse Mining and Geological Conditions," Energies, MDPI, vol. 13(2), pages 1-22, January.
    3. Malte Scharf & Ludger Heide & Alexander Grahle & Anne Magdalene Syré & Dietmar Göhlich, 2020. "Environmental Impact of Subsidy Concepts for Stimulating Car Sales in Germany," Sustainability, MDPI, vol. 12(23), pages 1-27, December.
    4. Faham Tahmasebinia & Chengguo Zhang & Ismet Canbulat & Samad Sepasgozar & Serkan Saydam, 2020. "A Novel Damage Model for Strata Layers and Coal Mass," Energies, MDPI, vol. 13(8), pages 1-17, April.
    5. Yuantian Sun & Guichen Li & Junfei Zhang & Deyu Qian, 2019. "Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines," Sustainability, MDPI, vol. 11(22), pages 1-17, November.
    6. Magdalena Tutak, 2019. "The Influence of the Permeability of the Fractures Zone Around the Heading on the Concentration and Distribution of Methane," Sustainability, MDPI, vol. 12(1), pages 1-24, December.
    7. Feng Cui & Yanbin Yang & Xingping Lai & Chong Jia & Pengfei Shan, 2019. "Experimental Study on the Effect of Advancing Speed and Stoping Time on the Energy Release of Overburden in an Upward Mining Coal Working Face with a Hard Roof," Sustainability, MDPI, vol. 12(1), pages 1-23, December.
    8. Lirong Wan & Xuehui Yu & Dejian Ma & Zhaosheng Meng & Qingliang Zeng & Guoqing Qi, 2022. "Dynamic Response Analysis of a Novel Anti-Impact Pressure Balance Jack," Energies, MDPI, vol. 15(14), pages 1-15, July.
    9. Yanpeng He & Qingxiang Huang, 2023. "Simulation Study on Spatial Form of the Suspended Roof Structure of Working Face in Shallow Coal Seam," Sustainability, MDPI, vol. 15(2), pages 1-20, January.
    10. Jia Liu & Fengshan Ma & Jie Guo & Guang Li & Yewei Song & Yang Wan, 2022. "A Field Study on the Law of Spatiotemporal Development of Rock Movement of Under-Sea Mining, Shandong, China," Sustainability, MDPI, vol. 14(10), pages 1-13, May.
    11. Qingxiang Huang & Yanpeng He, 2019. "Research on Overburden Movement Characteristics of Large Mining Height Working Face in Shallow Buried Thin Bedrock," Energies, MDPI, vol. 12(21), pages 1-22, November.
    12. Rasa Smaliukiene & Svajone Bekesiene, 2020. "Towards Sustainable Human Resources: How Generational Differences Impact Subjective Wellbeing in the Military?," Sustainability, MDPI, vol. 12(23), pages 1-21, November.
    13. Dengfeng Yang, 2021. "Analysis of Fracture Mechanics Theory of the First Fracture Mechanism of Main Roof and Support Resistance with Large Mining Height in a Shallow Coal Seam," Sustainability, MDPI, vol. 13(4), pages 1-24, February.
    14. Qingliang Zeng & Zhaoji Li & Lirong Wan & Dejian Ma & Jiantao Wang, 2022. "Research on Dynamic Characteristics of Canopy and Column of Hydraulic Support under Impact Load," Energies, MDPI, vol. 15(13), pages 1-20, June.
    15. Houqiang Yang & Changliang Han & Nong Zhang & Changlun Sun & Dongjiang Pan & Minghui Dong, 2019. "Stability Control of a Goaf-Side Roadway under the Mining Disturbance of an Adjacent Coal Working Face in an Underground Mine," Sustainability, MDPI, vol. 11(22), pages 1-18, November.

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