Abstract:
Objective It is of great significance to accurately understand the morphology of soil cracks in Benggang wall to reveal the development process of Benggang. Desiccation temperature affects the evaporation of soil water as well as the development of soil cracks. However, there is a lack of research on the temperature effect of desiccation cracks in soil of Benggang wall.
Method In this study, the soil of red soil layer in typical Benggang area was selected, and the surface parameters of cracks were quantitatively analyzed by image processing technology to explore the influence of temperature on the development of soil cracks in red soil layer of Benggang.
Result The results showed that when the temperature decreased, the evaporation rate of soil water decreased, the crack area and the total length of the crack increased, and the crack rate increased. At the same time, the block area decreased, the number of the block, the number of the crack and the number of the joint increased significantly, and the whole soil was more fragmented. Due to the significant increase in the number of cracks, the average length of cracks in soil samples at low temperature (40 ℃) was smaller than that at high temperature (80 ℃), that is, the number of cracks in soil samples at low temperature was more and the average length was smaller than that at high temperature. The average width of soil crack increased with the increase of temperature. The fractal dimension of soil crack increased with decreasing temperature. The temperature effect on soil desiccation crack development was significantly affected by soil clay content.
Conclusion The surface soil water evaporation time of red soil layer in the Benggang wall is longer under the condition of lower temperature, and the development process of cracks is slower, but the development degree is higher, and the crack structure is more complex.
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