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Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads

Eric R. Labelle   ORCID icon orcid.org/0000-0002-6799-0788 ; Technische Universität München Assistant Professorship of Forest Operations Hans-Carl-von-Carlowitz-Platz 2 D-85354, Freising GERMANY
Dirk Jaeger ; Albert-Ludwigs-Universität Freiburg Institute of Forest Sciences Werthmannstrasse 6 D-79098, Freiburg GERMANY
Benjamin J. Poltorak ; Earthmaster Environmental Strategies Ltd. 103-4813 4th AvenueEdson, Alberta CANADA

Puni tekst: engleski, pdf (3 MB) str. 227-242 preuzimanja: 204* citiraj
APA 6th Edition
Labelle, E.R., Jaeger, D. i Poltorak, B.J. (2015). Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads. Croatian Journal of Forest Engineering, 36 (2), 227-242. Preuzeto s https://hrcak.srce.hr/151784
MLA 8th Edition
Labelle, Eric R., et al. "Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads." Croatian Journal of Forest Engineering, vol. 36, br. 2, 2015, str. 227-242. https://hrcak.srce.hr/151784. Citirano 16.11.2019.
Chicago 17th Edition
Labelle, Eric R., Dirk Jaeger i Benjamin J. Poltorak. "Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads." Croatian Journal of Forest Engineering 36, br. 2 (2015): 227-242. https://hrcak.srce.hr/151784
Harvard
Labelle, E.R., Jaeger, D., i Poltorak, B.J. (2015). 'Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads', Croatian Journal of Forest Engineering, 36(2), str. 227-242. Preuzeto s: https://hrcak.srce.hr/151784 (Datum pristupa: 16.11.2019.)
Vancouver
Labelle ER, Jaeger D, Poltorak BJ. Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads. Croatian Journal of Forest Engineering [Internet]. 2015 [pristupljeno 16.11.2019.];36(2):227-242. Dostupno na: https://hrcak.srce.hr/151784
IEEE
E.R. Labelle, D. Jaeger i B.J. Poltorak, "Assessing the Ability of Hardwood and Softwood Brush Mats to Distribute Applied Loads", Croatian Journal of Forest Engineering, vol.36, br. 2, str. 227-242, 2015. [Online]. Dostupno na: https://hrcak.srce.hr/151784. [Citirano: 16.11.2019.]

Sažetak
In cut-to-length mechanized forest harvest operations, trees are cut, delimbed, and bucked to standard lengths directly in the harvest block. This in-stand processing, generates harvesting residue composed of tree limbs, tops, and foliage, which is frequently placed on machine operating trails to prolong trail trafficability and protect forest soils against heavy loadings. These so-called brush mats vary both in quantity and quality based on harvested wood and stand characteristics. The objectives of this study were to determine, quantify, and compare the load distributing capabilities of hardwood and softwood brush mats of different amounts (10, 20, 30, and 40 kg m-2) compared to no brush (0 kg m-2). This was done by laboratory tests analyzing the difference in strain recorded below brush mats at small scale when exposed to single and repetitive loadings. Brush mats (approx. 37 cm x 37 cm in area) were placed inside a test structure including a top open box with the bottom filled with a 15 cm thick layer of sand, below which strain gauges were installed. The entire test structure was positioned on a load frame programmed to lower a loading disk directly over the brush mat, thereby applying increasing loads up to 10 kN on the mat. Results suggest that for specific brush amounts and loadings, softwood brush showed a slightly better capacity to laterally distribute exerted loads than hardwood brush, especially at brush amounts of 10 and 20 kg m-2. At higher brush amounts, the differences of recorded loadings (strains) between the tested softwood and hardwood brush were reduced and at 40 kg m-2 hardwood brush contributed to a lower response of the strain gauges than softwood brush when subjected to 5 and 10 kN loadings.

Ključne riječi
brush mat; brush compressibility; strain; load distribution; soil protection; forest operations

Hrčak ID: 151784

URI
https://hrcak.srce.hr/151784

Posjeta: 299 *