Mechanisms of Mudcrack Formation and Growth in Bentonite Paste

Hirose, Kosaburo; Matsubara, Hitoshi

doi:10.1061/(asce)gt.1943-5606.0001853

Cited by 11 publications

(2 citation statements)

References 39 publications

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“…A careful observation of crack pattern after drying shows that the crack network is mainly composed of three types of polygon: quadrilateral, primary shape and pentagon (Figure 5B). The intersection points of the cracks are likely to form "T" and "Y" shapes, and similar observations have been reported in previous studies (Tang et al, 2011b;Hirose and Matsubara., 2018). The formation mechanism of "T" shapes crack can be explained by the maximum stress release criterion and crack propagation criterion proposed by Morris et al (1992).…”

Section: Desiccation Cracking and Cracks Morphologysupporting

confidence: 88%

Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay

Zhu

Zheng²,

Lan³

et al. 2022

Front. Earth Sci.

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The self-healing of desiccation cracks in compacted clayey soils is important for mechanism revelation of cracking behavior in compacted soils. Although the crack self-healing behavior has been found, the influence of soil physical indices on it is still unclear, especially initial water content and dry density of specimen. This study aims to identify and evaluate the effect of initial water content and dry density on self-healing of desiccation cracks. Firstly, a series of desiccation tests were conducted on compacted Hipparion red clay specimens under different initial conditions. Secondly, the two-dimensional morphology of desiccation cracks and strain field changes on specimen surface were examined using the pore and crack analysis system and digital image correlation techniques. The result shows that the desiccation cracks on specimen surface exhibits self-healing behavior during drying. Based on the observed crack self-healing behavior, the desiccation cracking of compacted Hipparion red clay undergoes four stages including initiation, development, self-healing, and stabilization. During the self-healing stage, the critical water content for occurrence of crack self-healing and the crack self-healing amount referring to the crack ratio reduction from peak value to the stable value, are dry density dependent and water content dependent variables. In particular, the higher the initial water content and the lower the dry density of compacted specimen are, the larger the crack self-healing amount is. This crack self-healing difference in specimen with different initial conditions is caused by the vertical anisotropic shrinkage of substrate soil below non-propagating cracks due to its pore structure difference. This study provides a new perspective on the mechanism of desiccation crack in clayey soils affected by initial conditions.

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Section: Desiccation Cracking and Cracks Morphologysupporting

confidence: 88%

Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay

Zhu

Zheng²,

Lan³

et al. 2022

Front. Earth Sci.

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“…The fractal theory can be applied to quantitatively evaluate the observed mesoscopic defects (such as pores and cracks) in rocks. The commonly used methods include Hausdorff dimension method, variational dimension method, box dimension method, and so on [23][24][25], among which, the box dimension method is the most suitable to describe the pores and cracks in the rock.…”

Section: Fractal Dimension Characterization Based On Semmentioning

confidence: 99%

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles

Yang

Zhang

Deng

et al. 2023

Period. Polytech. Civil Eng.

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The rock mass in the hydro-fluctuating zone of the reservoir bank slope is under dry-wet cycles for a long time, which will cause the deterioration of rock mass and induce geological disasters. In this study, a series of dry-wet cycle tests on the argillaceous quartz sandstone in the Three Gorges Reservoir area was carried out. Then, after different dry-wet cycles, the sandstone specimens were used to conduct the Brazilian splitting, scanning electron microscope, and 3D laser scanning tests. Herein, we provided detailed physical and microscopy image data to analyze the deterioration effect of tensile strength and mesostructure deterioration process of sandstone. With the increase of dry-wet cycles, the tensile strength of sandstone initially decreases rapidly, and then the decline rate tends to slow down. The evolution laws of fractal dimension and porosity are also significantly consistent with the deterioration of tensile strength. Moreover, further mesostructural analysis has revealed the repeated “absorption and swelling-dehydration and contraction” of clay minerals. This results in the breakage of framework mineral quartz and the expansion and connectivity of internal cracks, which ultimately deteriorates sandstone’s tensile strength.

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Mathematical modelling and simulation of microbial carbonate precipitation: the urea hydrolysis reaction

Matsubara

Yamada

2019

Acta Geotech.

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Mechanisms of Mudcrack Formation and Growth in Bentonite Paste

Cited by 11 publications

References 39 publications

Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay

Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles

Mathematical modelling and simulation of microbial carbonate precipitation: the urea hydrolysis reaction

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