Quantitative measurement and image analysis method of pore structure of granular materials

Abstract

A method for quantitative testing and image analysis of the pore fabric of a granular material is as follows: Step 1, theoretically defining the pore fabric tensor of the granular material; Step 2, standardizing the measurement steps of the pore fabric of the granular material; Step 3, according to Theoretical definition of the pore fabric tensor of granular materials, writing the program of image processing and image analysis; the quantitative test and image analysis of the pore fabric of granular materials refers to the use of experimental collection of mesoscopic images of materials, and the use of image processing and image analysis techniques to describe Orthotropy of the spatial distribution of pores in granular materials. The invention proposes a new method for quantitatively describing the orthotropic pore tensor of sand and soil based on the theoretical framework for describing the pore fabric of the material based on the morphological principle. In this method, any two amplitude parameters on the orthogonal surface are used to describe the three-dimensional orthotropic pore distribution, and one amplitude parameter is used to describe the transversely isotropic pore distribution.

Description

Technical field: [0001] The invention relates to the research on the constitutive relationship of the macro-micro-mechanical calculation of granular materials, friction materials and porous materials, in particular to a method for quantitative testing and image analysis of the pore structure of granular materials. Background technique: [0002] Void ratio is one of the most critical and widely used material physical property parameters to control the mechanical response of soil. In critical state soil mechanics, it is the only material physical parameter to describe the critical state. Recently, studies by Li and Dafalias (2012), Zhao and Guo (2013), and Abouzar et al. (2014) confirmed that the critical state line is not unique due to the anisotropy of the mesostructure of the soil, that is, the critical state void ratio is related to the hydrostatic The pressure relationship is not unique, which is a challenge to the uniqueness assumption of the critical state line in soil...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing pore structure description methods, there are human judgments and operations in the description process to varying degrees, or there are deficiencies such as inconvenient measurement methods and unclear physical meanings.

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