Influence of Machine-Made Sand Gradation and Content on the Evolution of Dry Shrinkage Cracks in Compacted Expansive Soil
The paper aims to deal with the influence of sand content and gradation on dry shrinkage cracking of compacted expansive soil.The expansive soil of a landslide in Mianxian County was taken to prepare compacted expansive soil samples with five kinds of machine-made sand content and four kinds of machine-made sand gradation,on which a series of drying tests were carried out.Using image processing technology and fractal theory,the development process of surface dry shrinkage fractures and the geometric parameters of the final fracture network were quantitatively analyzed.The results show that the increase of the surface crack area exhibits an increase in crack length in the early stage and an increase in crack width in the later stage.With the same sand gradation,as the sand content increases from 0%to 40%,the final surface crack rate decreases gradually,being 13.18%,11.39%,10.47%,8.91%and 7.68%respectively.The sand content(40%)is the same.With the increase of sand gradation from[0.15 mm,0.3 mm)to[1.18 mm,2.36 mm),the surface crack rate decreases in turn,which is 7.68%,7.66%,4.38%and 3.75%respectively.The variation of the fractal dimension of the crack is the same as that of the surface crack rate.
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