Influence of cyclic wetting and drying on swelling behavior of mudstone in south west of Iran

Doostmohammadi, R.; Moosavi, M.; Mutschler, Thomas; Osan, C.

doi:10.1007/s00254-008-1579-3

Cited by 75 publications

(27 citation statements)

References 12 publications

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“…Although previous results have suggested that swelling clay minerals are an important determinant of rock decay (Brown, 1981;Doostmohammadi, Moosavi, Mutschler, & Osan, 2009), the expansible clay mineral content of the rock did not show a positive relationship with the extent of decay under the same treatment in our study.…”

Section: Discussioncontrasting

confidence: 97%

Laboratory study of the effect of temperature difference on the disintegration of redbed softrock

et al. 2018

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To explore the impact of temperature difference (TD) on the disintegration of redbed softrock, three types of redbed rock, collected from Nanxiong Basin, were analyzed under three different treatments: TD, wetting and drying (WD), and TDWD-temperature difference and WD. To better understand the influence of different ranges of TD on disintegration during WD cycles, pH (hydrogen ion concentration) values, electrical conductivity (EC) values, and concentration of cations in leachate released during treatment were measured. The results show that no significant change can be observed under single TD treatment but that TD can increase the disintegration rate by accelerating the water-rock interaction. The effect of TD is more significant for rock with weak resistance to disintegration.

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Section: Discussioncontrasting

confidence: 97%

Laboratory study of the effect of temperature difference on the disintegration of redbed softrock

et al. 2018

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“…Our observations of dampened changes in rock-surface relative humidity and reduced drying under canopies via the retention of moisture support this. This is of particular significance for intertidal landforms composed of argillaceous rock (including mudstone used here) that are subject to repeated swelling and shrinking in response to tidal wetting and drying (Stephenson and Kirk, 2001;Kanyaya and Trenhaile, 2005;Trenhaile, 2006;Porter and Trenhaile, 2007;Doostmohammadi et al, 2009;Porter et al, 2010;Zhang et al, 2010). Dampened expansion and contraction in association with temperature fluctuations (i.e.…”

Section: Significance For Weathering On Rocky Coastsmentioning

confidence: 95%

Rock‐protecting seaweed? Experimental evidence of bioprotection in the intertidal zone

Gowell

Coombes

Viles

2015

Earth Surf Processes Landf

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Biogeomorphological processes are an important component of dynamic intertidal systems. On rocky shores, the direct contribution of microorganisms, plants and animals to weathering and erosion is well known. There is also increasing evidence that organisms can alter rock breakdown indirectly, by moderating temperature and moisture regimes at the rock-air interface. These influences have been purported to represent mechanisms of bioprotection, by buffering microclimatic fluctuations associated with weathering processes such as wetting and drying and salt crystallization. However, virtually nothing has been done to test whether microclimatic buffering translates to differences in actual rock breakdown rates.Here we report a preliminary laboratory experiment to assess how an artificial canopy (chosen to represent seaweed) affects mechanical rock breakdown. Using a simplified and accelerated thermal regime based on field data from a rocky shore platform in southern England, UK, we find that breakdown (mineral debris release) of mudstone covered with a canopy is reduced by as much as 79% relative to bare rock after around 100 thermal cycles. Reduction in rock surface hardness (measured using an Equotip device) was also greater for bare rock (17%) compared to covered rock (10%) over this period. Measurements of salt crystal formation indicate that the mechanism driving these differences was a reduction in the frequency of crystallization events, via moisture retention and shading of the rock surface.

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“…Therefore, understanding the effects of cyclic wetting-drying on mechanical behavior of rock is critical to rock engineering in reality. An impressive number of papers have been published in recent years addressing the subject of the effects of water-rock interaction on mechanical behavior of various rocks [6][7][8][9][10][11][12][13][14][15] . Previous studies have shown that the mechanism of water-rock interaction that leads to the weakening of strength mainly includes fracture energy reduction, capillary tension decrease, pore pressure increase, fractional reduction, and chemical and corrosive deterioration [16][17][18][19][20][21][22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone

Guo

Juan

et al. 2020

Preprint

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The understanding of the weakening mechanism of tensile strength of rock subjected to cyclic wetting-drying is critical for rock engineering. Tensile strength tests were conducted on a total of 35 sandstone specimens with different wetting-drying cycles. The crack propagation process and acoustic emission characteristics were obtained through a high-speed camera and acoustic emission system. The results indicate that the tensile strength is observably reduced after cyclic wetting-drying, and the extent of the reduction is not only related to the number of wetting-drying cycle, but also closely related to the clay mineral content of the sample. In addition, as the cycles of wetting-drying increase, the effect of each single cycle on tensile strength is getting smaller and smaller until becoming constant. Moreover, the crack initiation and penetration time is prolonged as the number of wetting-dry cycle increases, which indicates that cyclic wetting-drying weakens the rock stiffness and enhances the ductility of sandstone. Meanwhile, the acoustic emission characteristics during the experiment further confirmed this phenomenon. Furthermore, through the analysis of the microstructure and mineral composition of the samples with different wetting-drying cycles, it is concluded that the main weakening mechanisms of sandstones containing clay minerals are frictional reduction, chemical and corrosive deterioration.

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Influence of cyclic wetting and drying on swelling behavior of mudstone in south west of Iran

Cited by 75 publications

References 12 publications

Laboratory study of the effect of temperature difference on the disintegration of redbed softrock

Laboratory study of the effect of temperature difference on the disintegration of redbed softrock

Rock‐protecting seaweed? Experimental evidence of bioprotection in the intertidal zone

Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone

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