Clay scanning electron micrograph segmentation method based on porosity

Abstract

The invention provides a clay scanning electron micrograph segmentation method based on porosity. The clay scanning electron micrograph segmentation method comprises the following steps: adopting a conventional experimental method in soil mechanics to measure dry density of a clay sample and figuring out two thirds power of the dry density; preparing a microstructural sample of the clay sample in a laboratory; adopting a ZD-A3 freeze-dryer to freeze-drying the prepared sample, vacuumizing the sample, scanning the electron microscope when vacuum degree reaches 10-6Pa, observing a microstructure of the sample to obtain a scanning photograph; adopting image analysis software to extract binaryzation data corresponding to two thresholds; comparing parameter features of granule and porosity extracted under the two thresholds and figuring out area ratio of pore bodies; and stopping approaching when the area ratio equals to the two thirds power of the dry density and considering the threshold as picture segmentation threshold corresponding to the dry density. The beneficial effects of the clay scanning electron micrograph segmentation method provided by the invention are as follows: scientific change from three-dimensional parameters to two-dimensional parameters is realized, interference by man-made subjective factors is eliminated, and study for the microstructure of a soil body is more accurate.

Description

technical field [0001] The invention belongs to the field of rock and soil microstructure research in the discipline of civil engineering, and in particular relates to a method for determining clay microstructure parameters based on a scanning electron microscope. technical background [0002] The particles and particle aggregates and pores and pores of rock and soil are called the microstructure of rock and soil, and the overall size, shape, orientation, arrangement, and mutual contact and connection relationship are called the microstructure or microstructure of rock and soil Structure, which is the most basic element of soil. The relationship between the engineering properties of a material and the state it is in and its microstructure is corresponding. For geotechnical materials, microstructural parameters not only reflect their formation process, physical properties and mechanical properties, but also reflect their current state. The microstructure of clay is not only...

AI Technical Summary

Problems solved by technology

[0007] The main problem at present is: in the process of evaluating the microstructure of rock and soil SEM photos, the determination of the threshold cannot get rid of the influence of subjective factors. All results and conclusions obtained are subjective and not objective

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