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Rock weathering : The effects of varying rock moisture on controlled weathering cycles in low porosity limestone

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008020
URN zum Zitieren der Version auf EPub Bayreuth: urn:nbn:de:bvb:703-epub-8020-5

Titelangaben

Mitchell, Andrew ; Sass, Oliver:
Rock weathering : The effects of varying rock moisture on controlled weathering cycles in low porosity limestone.
In: Geomorphology. Bd. 457 (2024) . - 109149.
ISSN 1872-695X
DOI der Verlagsversion: https://doi.org/10.1016/j.geomorph.2024.109149

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Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

Examples of rockwall weathering processes include diurnal heating and cooling, diurnal and seasonal freezing, wetting and drying and thawing/seasonal active-layer thawing. These stress-loading processes often occur synergistically and cause a weakening of the rockwall through the propagation of sub-critical cracks. The Acoustic Emissions (AE) released by these cracking events can be measured in order to quantify the weathering efficacy. While the effects of thermal cycling are well studied, rock moisture content and its control on these weathering processes is rarely considered in detail. To better understand rock moistures effect on weathering processes we subjected Wetterstein limestone samples with different starting moisture contents (0 %, 25 %, 50 %, 75 %, 100 %) to thermal cycling above (5 to 35 °C) and below (5 to −10 °C) freezing and a longer freezing cycle with gradual stepped thawing (10 to −10 °C). In addition to this we simulated wetting and drying cycles at a constant temperature. For all of these weathering cycles, relative efficacy was assessed by amount of AE hits and change in effective porosity. Rock moisture was found to have little effect on the overall AE count and effective porosity increase over shorter thermal cycling. However, freeze-thaw cycling was shown to have similar weathering effect to thermal cycling of 3 K greater thermal gradient above freezing. Meanwhile longer duration freezing cycles see an increase of rock moisture create 4× as many cracking events compared to dry samples. More re-freezing events are seen in lower saturation samples and when considered with the synergistic effects of wetting and drying in natural open systems, the presence and mobility of pore water are considered to be more important than the quantity.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Keywords: Rock weathering; Rock moisture; Thermal cycling; Acoustic emissions
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Geomorphologie > Lehrstuhl Geomorphologie - Univ.-Prof. Dr. Oliver Sass
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Geomorphologie
Sprache: Englisch
Titel an der UBT entstanden: Ja
URN: urn:nbn:de:bvb:703-epub-8020-5
Eingestellt am: 17 Okt 2024 09:31
Letzte Änderung: 17 Okt 2024 09:31
URI: https://epub.uni-bayreuth.de/id/eprint/8020

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