Modified Rock Bolt Support for Mining Method with Controlled Roof Bending

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

Energies, 2020, vol. 13, issue 8, 1-20

Abstract: The article presents methods of making the rock bolt support more yieldable, especially for a stratified roof. Alongside the increasing depth of exploitation of raw material deposits, rock bolt support units are more often designed taking into account more intensive deformations and displacements of underground excavations. In the article, a room and pillar method with mined roof bending and roof reinforcement with bolt patterns of 1 m × 1 m, 1.5 m × 1.5 m and 2 m × 2 m is presented. Moreover, the laboratory tests included 1.8 m long bolts, which were embedded segmentally on the lengths of 100 mm, 150 mm and 200 mm were tested. Based on the load–displacement characteristics, the deformation energy for flat and profiled dome bearing plates was calculated. Making the segmentally embedded resin rock bolt support yieldable enabled it to perform additional work. Furthermore, it was found that rock bolt support with a dome bearing plate took over 2.5 times more energy compared to a rock bolt support equipped with a flat bearing plate.

Keywords: resin rock bolt support; embedded length; rock bolt pattern; room and pillar method with mined roof bending; work of rock bolt support (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 (8)

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