Digital Image Analysis on Structure of Constructional Waste Soil Cemented by Microorganisms
It is of direct significance to carry out quantitative research on the morphology of microbial ce-mented constructional waste soil for analyzing the effect of soil improvement.The morphological indexes such as rectangularity,shape indexes,angularity and overall contour coefficients could directly and quanti-tatively characterize the soil structure,which are important parameters to reflect the stability and cured effect of soil.The apparent scan of the microbial cemented soil by CT was conducted,and the geometric shape parameters(the length,perimeter,area,external rectangular area,and equivalent elliptical perime-ter)of cemented soil particles were obtained by the digital image processing technique.The geometric shape coefficient,namely morphological index,was calculated statistically,so as to quantitatively character-ize the microbial cemented soil structure and analyze the correlation between geometric shape coefficient and gradation.The results showed:with the increase in the scale of the structure,the shape index and the angularity of the microbial cemented constructional waste soil increased as a whole,the rectangularity and the overall contour coefficient decreased,the structure shape was more irregular.The geometric shape coef-ficient had a good correlation with the particle gradation of cemented construction waste soil.It was because that the calcium carbonate induced by microbial precipitates covered and accumulated on the surface of the soil particles,increasing the particle size of the waste soil and making the particle surface rougher,and then changing the primary characteristic parameters,affecting the morphological indexes.
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