Comparing the reinforcement capacity of welded steel mesh and a thin spray-on liner using large scale laboratory tests |
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| Affiliation: | 1. Cardiology Division, Centre Hospitalier Universitaire de Sherbrooke, Sherbrooke, Québec, Canada;2. Department of Radiology, Centre Hospitalier Universitaire de Sherbrooke, Québec, Canada;3. Cardiothoracic Surgery Division, Hôpital du Sacré-Coeur de Montréal, Montréal, Québec, Canada;1. PG Department of Physics, GVM Girls College, Sonepat 131001, India;2. Department of Physics, Hindu College, Sonepat 131001, India;3. Solid State Physics Laboratory, Lucknow Road, Delhi 11054, India;4. Department of Physics, GVM Girls College, Sonepat 131001, India;5. School of Physics & Materials Science, Thapar University, Patiala 147004, India;1. Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Paulínska 16, 917 24 Trnava, Slovak Republic;2. Institute of Physics, Slovak Academy of Sciences, Dúbravská 9, 845 11 Bratislava, Slovak Republic;3. JEOL Ltd., Tokyo, Japan;4. Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, D-22607 Hamburg, Germany;1. Nelson Institute of Environmental Medicine, New York University School of Medicine, 57 Old Forge Road, Tuxedo, NY 10987, United States;2. Pathology Department, Wuhan University, 185 Donghu Rd., Wuhan, Hubei 430071, China;3. Physiology Department, Wuhan University, 185 Donghu Rd., Wuhan, Hubei 430071, China |
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| Abstract: | Steel mesh is used as a passive skin confinement medium to supplement the active support provided by rock bolts for roof and rib control in underground coal mines. Thin spray-on liners (TSL) are believed to have the potential to take the place of steel mesh as the skin confinement medium in underground mines. To confirm this belief, large scale laboratory experiments were conducted to compare the behaviour of welded steel mesh and a TSL, when used in conjunction with rock bolts, in reinforcing strata with weak bedding planes and strata prone to guttering, two common rock conditions which exist in coal mines. It was found that while the peak load taken by the simulated rock mass with weak bedding planes acting as the control sample (no skin confinement) was 2494 kN, the corresponding value of the sample with 5 mm thick TSL reinforcement reached 2856 kN. The peak load of the steel mesh reinforced sample was only 2321 kN, but this was attributed to the fact that one of the rock bolts broke during the test. The TSL reinforced sample had a similar post-yield behaviour as the steel mesh reinforced one. The results of the large scale guttering test indicated that a TSL is better than steel mesh in restricting rock movement and thus inhibiting the formation of gutters in the roof. |
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| Keywords: | Steel mesh Thin spray-on liners Large scale laboratory experiments Strata with weak bedding planes Strata prone to guttering |
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