Quantitative test and image analysis method of particle material pore fabric
A technology of granular material and pore structure, which is applied in the research field of macroscopic and mesomechanical calculation of its constitutive relationship, can solve the problems of inconvenient measurement method and unclear physical meaning
Active Publication Date: 2015-09-23
NINGXIA UNIVERSITY
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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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Embodiment 1
[0054] Embodiment 1: According to the theoretical determination method of the pore fabric tensor of the granular material proposed by the inventor, the image analysis and image processing Matlab program of the theory of the pore fabric tensor of the granular material is developed, and the overall process is as follows figure 1 as shown, figure 1 The overall flow of the determination of the entire mesoscopic pore fabric is given in , and the specific steps are as follows:
[0055] Step s1, sand sample solidification, cube sample cutting, grinding, polishing, and gold spraying;
[0056] Step s2, obtaining SEM mesoscopic images of three orthogonal surfaces;
[0057] Step s3, image processing;
[0058] Step s4, drawing parallel test lines and circular test lines;
[0059] Step s5, image analysis and calculation to obtain a pore distribution function;
[0060] Step s6, calculating the plane tensor;
[0061] Step s7, calculating the magnitude parameter and direction;
[0062] ...
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A quantitative test and image analysis method of a particle material pore fabric comprises following steps: step 1, performing theoretical definition on a tensor of the particle material pore fabric; step 2, standardizing test steps of the particle material pore fabric; step 3, compiling an image processing and image analysis program according to the theoretical definition of the tensor of the particle material pore fabric, wherein the quantitative test and image analysis of the particle material pore fabric mean that a material microscomic image is collected by experiments, and orthotropy of particle material pore special distribution is described by using the image processing and analysis technology. A theoretical frame of the material pore fabric is described based on a morphology principle, a new quantitative description method for orthotropy pore tensor of sand soil is provided, in the method, the three dimensional orthotropy pore distribution is described by any two amplitude values on an orthogonal surface, and transverse isotropy pore distribution is described by one amplitude value parameter.
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...
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IPC IPC(8): G01N15/08
Inventor 李学丰孟凡超
Owner NINGXIA UNIVERSITY