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Abstract Loess geological disaster is closely related to its microstructural characteristics. For the issues now existing in quantitative analysis of scanning electron microscope(SEM) image，the microstructural characteristics of intact and cyclic loaded Q3 losses are studied. Firstly，noise reduction and segmentation method in the scanning electron microscope(SEM) image processing are discussed. A SEM image analysis method is presented by applying Lee image enhancement algorithm to image noise reduction and applying the fuzzy C-means clustering method to gray-scale image segmentation. With the presented SEM image analysis method，the pore area，pore size，roundness，shape ratio and other parameters of Q3 losses before and after cyclic loading are calculated. The results indicate as follows：(1) Large pores number of loess decreases，loess particles gradually arrange densely，and their contact relationship changes from point contact to surface contact under dynamic stress by analyzing the appearance features of SEM images. (2) The deformation produced by cyclic loading is mainly due to damage of large pores by analyzing pore area and its number changes. (3) Loess pores get a directional feature and the features change after damage of soil structure due to cyclic loading by analyzing loess pore directional distribution characteristics. (4) Based on the study of pore shape distribution characteristics，the soil particles may rotate and narrow pore of loess changes greatly，which resultantly result in the damage of pore connectivity. The study can provide basis for soil macroscopic deformation mechanism.
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Received: 25 February 2010
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2011, Vol. 30 
