Abstract
To improve ground skin support in highly stressed underground mines, new types of thin spray-on liners (TSL) are currently under development to replace steel mesh. To test these products, three different types of support material were tested for their ability to resist buckling failure, a mode of failure typically experienced by strata in highly stressed mine roadways. Steel mesh, as currently used for skin support, and two types of glass fibre-reinforced polymeric TSL materials were tested and compared. One of the TSL materials FRP Y was specifically designed for coal mining application. Four hydrostone slabs, cast to promote buckling, were bolted together to mimic laminated roof strata, coated with each material and tested in compression. Test results indicated that due to the strong bond, specimens reinforced with TSL materials had greater stiffness and peak strength than specimens with no support or those supported with steel mesh. On average, the specimens supported with steel mesh were approximately 1.7 times stronger than the unsupported control specimens while the specimens supported with FRP X and FRP Y were 3.2 and 2.3 times stronger, respectively. Experiments clearly indicate that the bonding characteristics of the TSL material formed a composite layer with the rock skin thus increasing the specimen’s ability to resist rock skin failure.
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Abbreviations
- TSL:
-
Thin spray-on liner
- FRP:
-
Fibre reinforced polymer
- \({k_{\text{o}}}\) :
-
Overall stiffness
- \({l_{\text{p}}}\) :
-
Peak load
- \({d_{\text{p}}}\) :
-
Displacement at peak load
- \({k_{\text{e}}}\) :
-
Effective stiffness
- \(~{l_{\text{c}}}\) :
-
Load at critical point
- \({d_{\text{c}}}\) :
-
Displacement at critical point
References
Ahn T (2011) Thermal and mechanical studies of thin spray-on liner (TSL) for concrete tunnelling. PhD thesis, University of Western Ontario
Archibald JF (2004) Canadian laboratory and field testing. In: Potvin Y, Stacey TR, Hadjigeorgiou J (eds) Surface support in mining. Australian centre for Geomechanics, Nedlands, pp 73–87
Bauer ER, Dolinar DR (2000) Skin failure of roof and rib and support techniques in underground coal mines. In: New technology for coal mine roof support. NIOSH information circular, pp 99–109
Connor CP, Brummer RK, Swan G, Doyle (2003) FLAC numerical simulations of the behavior of a spray-on liner for rock support. Proceedings of the 3rd international FLAC symposium, Sudbury, pp 295–299
Dolinar DR, Mucho TP, Oyler DC, Pablic J (2000) Utilising the “advanced and relieve” method to reduce horizontal stress effects on the mine roof, a case study. In: 19th international conference on ground control in mining, Morgantown, 8–10 August, pp 137–48
Espley SJ, Gustas R, Moreau LH, Heilig J (2004) Thin spray-on liner research and field trials at Inco. In: Potvin Y, Stacey TR, Hadjigeorgiou J (eds) Surface support in mining. Australian centre for Geomechanics, Nedlands, pp 205–214
Finn DJ (2004) Thin spray-on liner tests. In: Potvin Y, Stacey TR, Hadjigeorgiou J (eds) Surface support in mining. Australian centre for Geomechanics, Nedlands, pp 89–95
Kuijpers JS, Sellers EJ, Toper AZ, Rangasamy T, Ward T, Rensburg AJ, Yilmaz H, Stacey D (2004) Required technical specifications and standard testing methodology for thin sprayed linings. SIMRAC Project 200206, Johannesburg
Li Z, Saydam S, Mitra R, Chalmers D (2015) Investigation on adhesion strength of thin spray-on liners in an underground coal mine. In: Proceedings of the coal 2015 15th underground coal operator’s conference, University of Wollongong, Wollongong, pp 191–197
Lukey C, Spinks G, Baafi E, Porter I, Nemcik J (2008) Polymer-based alternative to steel mesh for coal mine strata reinforcement. In: Proceedings of the coal 2008 8th underground coal operator’s conference, University of Wollongong, Wollongong, pp 110–116
Mercer RA (1992) The investigation of thin polyurethane linings as an alternative method of ground control. Master thesis, Queen’s University, Kingston
Nemcik J, Porter I, Baafi E, Lukey C (2009) Geotechnical assessment of skin reinforcement in underground mines. In: Proceedings of 28th international conference on ground control in mining, Morgantown, pp 256–260
Nemcik J, Porter I, Baafi E, Navin J (2011a) Determining the ultimate strength of ‘tough skin’, a glass fibre reinforced polymer liner. In: Proceedings of the coal 2011 11th underground coal operator’s conference, University of Wollongong, Wollongong, pp 154–158
Nemcik J, Porter I, Baafi E, Towns J (2011b) Bearing capacity of a glass fibre reinforced polymer liner. In: Proceedings of the coal 2011 11th underground coal operator’s conference, University of Wollongong, Wollongong, pp 148–153
Oggeri C (2000) Design methods and monitoring in ornamental stone underground quarrying. GeoEng 2:151
Ozturk H, Tannant DD (2011) Influence of rock properties and environmental conditions on thin spray-on liner adhesive bond. Int J Rock Mech Min Sci 48:1196–1198
Qiao Q, Nemcik J, Porter I, Baafi E, Zhang Z, Shan Z (2014) Development of testing methods of thin spray-on liner shear-bond strength. In: Alejano R, Perucho A, Olalla C, Jimenez R (eds) Proceedings of EUROROCK: rock engineering and rock mechanics: structures in and on rock masses. Taylor & Francis Group, London, pp 125–130
Saydam S, Yilmaz H, Stacey TR (2003) A new testing approach for thin spray-on liners: double-sided shear strength (DSS) test. In: Proceedings of 3rd international seminar on surface support liners: thin spray-on liners, shotcrete and mesh, Sect. 18, Quebec
Shan Z, Porter I, Nemcik J, Baafi E (2014) Comparing the reinforcement capacity of welded steel mesh and a thin spray-on liner using large scale laboratory tests. Int J Min Sci Technol 24(3):373–377
Shen B (2014) Coal mine roadway stability in soft rock: a case study. Rock Mech Rock Eng 47:2225–2238
Spearing AJS, Gelson J (2002) Developments and the future of thin reactive liners since the previous conference in Australia. In: Proceedings of 2nd international seminar on surface support liners: thin sprayed liners, shotcrete, mesh. SAIMM, Sandton, Sect. 13, pp 1–10
Spearing AJS, Ohler J, Attiogbe E (2004) The effective testing of thin spray-on liners (superskins) for use in underground mines. In: Potvin Y, Stacey TR, Hadjigeorgiou J (eds) Surface support in mining. Australian centre for Geomechanics, Nedlands, pp 97–102
Standards Association of Australia (1978) Australia standard: determination of the flexural properties of plastics (AS 2132-1978). Standards Australia, North Sydney
Standards Association of Australia (2001a) Australia standard: determination of tensile properties of plastic materials part 2: test conditions for moulding and extrusion plastics (AS 1145.2-2001). Standards Australia, North Sydney
Standards Association of Australia (2001b) Australia standard: determination of tensile properties of plastic materials part 4: test conditions for isotropic and orthotropic fibre-reinforced plastic composites(AS 1145.4-2001). Standards Australia, North Sydney
Swan G, Henderson A (2004) Water-based spray-on liner implementation at Falconbridge Limited. In: Potvin Y, Stacey TR, Hadjigeorgiou J (eds) Surface support in mining. Australian centre for Geomechanics, Nedlands, pp 215–219
Tadolini SC, Kraus PW, Worbois A (2000) High capacity tensioned cable bolts for tailgates support. In: 19th International conference on ground control in mining, Morgantown, 8–10 August, pp 59–66
Tannant DD (1998) Tensile strength tests on Rockguard. Report to INCO limited, Ontario Division, by the Geomechanics Research Centre, Laurentian University
Tannant DD, Swan G, Espley S, Graham C (1999) Laboratory test procedures for validating the use of thin sprayed-on liners for mesh replacement. In: Proceedings of Canadian Institute of Mining, Metallurgy and Petroleum 101st Annual General Meeting, Calgary, p 8
Wu L, Cui C, Geng N, Wang J (2000) Remote sensing rock mechanics (RSRM) and associated experimental studies. Int J Rock Mech Min Sci 37:879–888
Yilmaz H (2010) Tensile strength testing of thin spray-on liner products (TSLs) and shotcrete. J S Afr Inst Min Metall 110:559–569
Yilmaz H (2011) Development of testing methods for comparative assessment of thin spray-on liner (TSL) shear and tensile properties. PhD thesis, University of the Witwatersrand
Zhang Y, Peng S (2002) Design considerations for tensioned bolts. In: 21st international conference on ground control in mining, Morgantown, 6–8 August, pp 45–52
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Shan, Z., Porter, I., Nemcik, J. et al. Investigating the behaviour of fibre reinforced polymers and steel mesh when supporting coal mine roof strata subject to buckling. Rock Mech Rock Eng 52, 1857–1869 (2019). https://doi.org/10.1007/s00603-018-1656-1
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DOI: https://doi.org/10.1007/s00603-018-1656-1