Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass

Krzysztof Skrzypkowski, Waldemar Korzeniowski, Krzysztof Zagórski and Anna Zagórska
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Krzysztof Skrzypkowski: Faculty of Mining and Geoengineering, AGH University of Science and Technology, Mickiewicza 30 av., 30-059 Cracow, Poland
Waldemar Korzeniowski: Faculty of Mining and Geoengineering, AGH University of Science and Technology, Mickiewicza 30 av., 30-059 Cracow, Poland
Krzysztof Zagórski: Faculty of Mechanical Engineering and Robotics, AGH University of Science and Technology, Mickiewicza 30 av., 30-059 Cracow, Poland
Anna Zagórska: Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Cracow, Poland

Energies, 2020, vol. 13, issue 8, 1-23

Abstract: The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the maximal range of the rock damage area and the total displacements in the expanded room. The models were made for a room and pillar method with a roof sag for copper ore deposits in the Legnica-G?ogów Copper District in Poland. Additionally, in the article a load model of the rock bolt support as a result of a geomechanical seismic event is presented. Based on the results of laboratory tests (load–displacement characteristics), the strain energy of the bolt support equipped with the yielding device in the form of dome bearing plates was determined and compared with the impact energy caused by predicted falling rock layers. Based on the laboratory tests, numerical modeling and mathematical dynamic model of rock bolt support, the dependence of the drop height and the corresponding impact energy for the expanded room was determined.

Keywords: rock bolt support; yielding; stratified rock mass; load model of rock bolts (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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