Characterization of crack networks in desiccating soils using image analysis techniques

Image analysis techniques can be applied to study the crack patterns that appear in cohesive soils under drying conditions due to changes in the environmental conditions. Qualitative and quantitative characterization of these crack networks is needed to study the mechanical behavior of a cracking soil, how cracks generate and propagate. The paper describes a simple technique to process sequences of images obtained during laboratory tests, and how information can be gathered by means of image analysis, including average crack width, total crack length, total area of cracks, number, area and aspect ratio of un-cracked cells, surface shrinkage, etc. Crack initiation and time evolution of the crack pattern can also be determined. An example of application that shows size-effect in the drying of soils is presented.