Simulation of the Effect of Coal Microstructures on the Macroscopic Mechanical Behavior

Abstract

This paper investigates the influence of mineral structure on macromechanical behavior of coal under different loading conditions using X-ray CT scanning experimental and numerical methods. The three-dimensional (3D) reconstruction of coal was conducted to assess the spatial distribution characteristics of the mineral structure by AVIZO software. Based on fractal box dimension (BCD) and equivalent diameter, the mineral structures were quantitatively characterized. The 3D finite element models with three distribution characteristics of minerals were built, and the model was considered as a random heterogeneous two-phase material composed of coal matrix and mineral matter. The results show that the frequency of mineral structures decreases with the increase of equivalent diameter in the coal sample. The BCD of the original mineral structure in coal is greater than 2, but the BCD of each part of the minerals divided based on the screening principle is less than 2. Under uniaxial conditions, the elastic modulus, peak strength, and residual strength of coal are monotonically increasing with the size of the mineral structure. The larger the mineral structure size and the more complex the distribution are, the greater the area of stress concentration and the more uniformity the distribution will be. The failure (plasticity) first occurred at the interface between the matrix and the mineral, and the failure zone is significantly different due to the influence of different mineral structures. Under confining pressure, the presence of mineral structure decreases the brittleness of coal, and the variation of brittleness is related to the size and spatial distribution of mineral structures. The fitting relationship between confining pressure and brittleness index is linear, and the correlation coefficient exceeds 0.95.

Review on Applications of X-ray Computed Tomography for Coal Characterization: Recent Progress and Perspectives

“…The geometry, size, and distribution of irregular minerals in coal are primary factors that constitute its heterogeneity characteristics and significantly influence the macroscopic mechanical behavior of coal. The specific influence of minerals on the mechanical behavior of coal has been investigated by constructing finite element models containing different mineral structures and performing uniaxial compression simulations. , The results showed that the larger the size and higher the content of minerals, the more complex the distribution. Under uniaxial conditions, the presence of minerals and the increase in mineral sizes increase the peak strength, elastic modulus, and residual strength of coal (Figure ).…”

“…Relationship between macroscopic mechanical behavior of coal and microscopic parameters of minerals. [Modified with permission from refs (Copyright 2020, The Authors, published by Journal of Mining & Safety Engineering ) and (Copyright 2020, Y. Fu and Z. Feng. Authors under Creative Commons Attribution 4.0 International License (CC BY 4.0)).…”

“…63,64 The equivalent diameter is an important parameter for quantifying the irregular structure. 65 Similar to analysis of pores and fractures, minerals can be divided into four categories, according to their equivalent diameters: small-size minerals with an equivalent diameter d ≤ 500 μm, medium-size minerals with sizes of 500 μm < d ≤ 1000 μm, larger-size minerals with 1000 μm < d ≤ 2000 μm, and large-size minerals with sizes of d > 2000 μm. According to eq 3, the equivalent diameter of minerals can be calculated.…”