Abstract
Shrinkage, deformation, and cracking will occur under extreme climate conditions such as drought, due to the accumulation of salt inside the soil during the evaporation of water on the surface of the soil. In this study, the image processing method was used to quantitatively analyze the dehydration cracking process of clay polluted by alkaline pollutant sodium carbonate on the basis of experiments. The mechanism of the effect of sodium carbonate concentration on the shrinkage cracks of clay was discussed through the analysis and comparison of different concentrations of sodium carbonate samples. The results showed that the water loss and shrinkage cracks of alkaline contaminant clay were developed in different stages. Firstly, first‐level cracks developed diagonally or parallel to the edge of the container, and then second‐level cracks developed along the main cracks with an angle of close to 90°. Most of the third‐level or higher‐level cracks were approximately perpendicular to the second‐level cracks or the edge of the container and developed in parallel. In the cracking stage, the water loss ratio of the sample had a good positive correlation with the surface crack ratio. The slope of the fitted curve increased with the increase of the sodium carbonate concentration. With the increase of sodium carbonate concentration, the water loss ratio and the width of first‐level cracks of clayey soil decreased, and the total length and the number of cracks increased, while the surface cracking ratio increased first and then decreased.
Highlights
Desiccation cracking of clay on the surface is a commonly natural phenomenon, especially for expansive clays. e phenomenon is more common when the regional temperature changes or during frequent droughts and floods
Moisture evaporation and fracture development of clay under different temperatures and dry and wet conditions were studied quantitatively [2,3,4,5]. rough the freeze-thaw test, the relationship between water loss and surface crack development was studied in clay freeze-thaw cycle, and the fractal dimension of the fracture morphology was quantitatively analyzed by using image processing technology [6]
E main purpose of this study is to examine the relationship of crack with respect to evaporation and water content characteristics for the soil contaminated by the alkaline pollutant. e image processing method was used to quantitatively analyze the dehydration cracking process of clay polluted by alkaline pollutant sodium carbonate. e relationship between the cracking characteristics such as the water loss ratio and crack area ratio of the sample with time was mainly analyzed. e mechanism of the effect of sodium carbonate concentration on the shrinkage cracks of clay was discussed through the analysis and comparison of different concentrations of sodium carbonate samples
Summary
Received 14 December 2020; Revised 5 January 2021; Accepted 3 March 2021; Published 11 March 2021. The image processing method was used to quantitatively analyze the dehydration cracking process of clay polluted by alkaline pollutant sodium carbonate on the basis of experiments. E results showed that the water loss and shrinkage cracks of alkaline contaminant clay were developed in different stages. Most of the third-level or higher-level cracks were approximately perpendicular to the second-level cracks or the edge of the container and developed in parallel. The water loss ratio of the sample had a good positive correlation with the surface crack ratio. With the increase of sodium carbonate concentration, the water loss ratio and the width of first-level cracks of clayey soil decreased, and the total length and the number of cracks increased, while the surface cracking ratio increased first and decreased
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