Technology of Exposed Rock Surface Insulation against the Influence of Mine Atmosphere
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__________________________ MINERAL MINING ________________________________ TECHNOLOGY
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Technology of Exposed Rock Surface Insulation against the Influence of Mine Atmosphere Yu. N. Shaposhnika*, A. I. Konurina, O. M. Usol’tsevaa, A. A. Neverova, and S. A. Neverova a Chinakal Institute of Mining, Siberian Branch, Russian Academy of Science, Novosibirsk, 630091 Russia 91 Russia *e-mail: [email protected] Received April 30, 2020 Revised May 23, 2020 Accepted May 29, 2020 Abstract—The authors discuss the problem connected with insulation of exposed rock surface areas against the aggressive influence of mine atmosphere and rock falls during mining. The lab-scale tests determine the moisture effect on the strength of rocks in the Orlov Ore Field. The tensile strength of samples of isolation membrane as well as their adhesion to rocks and shotcrete is assessed. The technology of preparation and application of polymer membrane insulation layer on the surface of differently damaged areas on the roof and sidewalls in stopes is justified for the Orlov Mine. Keywords: Rocks, shotcrete, spray-on membrane insulation, strength characteristic, adhesion, stope, exposed surface, stability. DOI: 10.1134/S1062739120036714
INTRODUCTION
Aiming to insulate rock mass from weathering, oxidation, failure and spontaneous ignition, the Kuzbass mines [1–8], NorNickel’s Polar Division [9], Kaz Minerals and others commonly use special latex–cement mixtures. Mines Komsomolsky, Oktyabrsky, Skalisty and Taimyr of NorNickel’s Polar Division use resin-grouted rock bolts and shotcrete alongside with polymeric rock bolts and 4–5 mm thick TekFlex sealant coating of roof and sidewalls. This technology was introduced in an inclined haulage drift in Raspadskaya-Koksovaya mine. Filling the void behind the lining with phenol resin BlokFil suppressed oxidation and spontaneous heating of rocks to critical temperatures as well as reduced heating of mine air from ‘hot’ rocks to standard-specified temperatures [10–13]. Polyurethane mixture is composed of three low-viscous working fluids. Such coating creates a screen to prevent interaction of mine air and adjacent rocks [14–18]. Preparation and application of insulating polymeric membrane on exposed surfaces in mines is a promising though insufficiently studied method of insulation and protection of adjacent rocks from mine air. Actually, coating of exposed surfaces in mines is a challenging problem. Enclosing rocks of the Orlov complex sulphide ore deposit are very unstable due to numerous differently oriented microfractures filled with calcite and pyrite as well and slickensides. At ore–wall rock interfaces, zones of unstable and hydrothermally altered rocks are observed. When exposed, relived and watered, such rocks loose integrity and fall in mine excavation
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