Heavy rockbursts due to longwall mining near protective pillars: A case study

0500796 - ÚGN 2019 RIV CN eng J - Journal Article
Koníček, Petr - Schreiber, Jan
Heavy rockbursts due to longwall mining near protective pillars: A case study.
International Journal of Mining Science and Technology. Roč. 28, č. 5 (2018), s. 799-805. ISSN 2095-2686. E-ISSN 2212-6066
R&D Projects: GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : rockburst * rockburst prevention * hardcoal longwall mining * induced seismicity * protective pillar
OECD category: Geology
https://www.sciencedirect.com/science/article/pii/S2095268618304841

Rockburst represents a very dangerous phenomenon in deep underground mining in unfavourable conditions such as great depth, high horizontal stress, proximity of important tectonic structures, and unmined pillars. The case study describes a recorded heavy rockburst in the Czech part of the Upper Silesian Coal Basin, which occurred during longwall mining near the protective pillar. The artificial dividing of geological blocks and creation of mining protective pillars (shaft pillars, crosscut pillars etc.) is a dangerous task in light of rockbursts occurring mainly due to overstressing of remaining pillars. A simple model of this situation is presented. Natural and mining conditions are analysed and presented in detail as well as registered seismicity during longwall mining in the area. Recorded rockbursts in the area of interest are described and their causes discussed. Many rockbursts near protective pillars were recorded in this mining region. Methodical instructions for rockburst prevention in proximity of protective pillars as well as for gates driving were devised based on the evaluation of rockburst causes. The paper presents these principles for prevention.
Permanent Link: http://hdl.handle.net/11104/0292835