The Influence of Internal Boundary and Lower Limit of Water Content on Desiccation Cracking of Clay
In order to study the effects of internal boundary and lower limit of water content on desiccation cracking of clay,dry and wet cycle experiments were conducted with different lower limits of water content by setting obstacles in-side the test soil sample to simulate the internal boundary existing in actual soil.The experimental results were pro-cessed by computer vision method,the development history and final morphology of the crack are studied,and the crack ratio,total crack length and average crack width are quantitatively analyzed.The results show that:(1)The de-velopment of crack is significantly affected by internal obstacles.According to the characteristics of cracks,they can be divided into five types:crack along obstacles(ring knife),radial crack,annular crack,small crack and closed annular crack.(2)With the decrease of water content,the crack ratio,total crack length and average crack width increase.(3)With the increase of dry and wet cycles,the lower the lower limit of water content,the more obvious the increase in crack ratio and total crack length.
claydesiccation crackingdry and wet cyclesinternal boundarywater content
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