Abstract
Taking raw coal and briquette coal samples with preset center holes as research objects, this paper makes a systematic analysis and research of crack evolution laws of the two different coal samples under the local load. The results show that the raw coal and briquette coal samples are different mainly in number, dimension, and complexity of the internal microstructures, so it is not right to replace raw coal with briquette coal when performing observational study of the crack evolution of microstructures; under the effect of local load, local property, randomness of crack initiation position, and crack initiation stress of raw coal samples are greater than those of briquette coal samples; law of instantaneous maximum effective cut-through rate of raw coal samples is more complex than that of briquette coals; under the effect of uniformly distributed load, end effect factor Fe, sample microstructure influencing factor Fs, and preset center hole factor Fh are the major factors influencing crack growth, among which the amplified end effect factor Fe and sample microstructure influencing factor Fs are dominant factors; under the effect of local load, local load influencing factor Fp, end effect factor Fe, sample microstructure influencing factor Fs, and preset center hole factor Fs are the major factors influencing crack growth, among which the local load influencing factor Fp, end effect factor Fe, and sample microstructure influencing factor Fs are dominant factors. Compared with briquette coal samples, raw coal samples are more sensitive to influencing factors, such as local load influencing factor Fp, end effect factor Fe, sample microstructure influencing factor Fs, and preset center hole factor Fh, and can aggravate the influence of these factors on the crack growth; the paper also puts forward a method for describing local load based on a coupling mechanical model of uniaxial compression and local shear.
Highlights
As geological materials formed under special geological conditions and environment, coal resources are characterized by porosity, aeolotropy, and heterogeneity
For the above three major reasons, it is significantly difficult to prepare coal samples for conducting mechanics experiment research with the standard size recommended by the International Society for Rock Mechanics
Because the briquette coal samples cannot completely reflect the features of the internal structures of raw coal, it has been disputed whether using briquette coal samples for experiment can achieve the right law that can accurately show the features of raw coal
Summary
As geological materials formed under special geological conditions and environment, coal resources are characterized by porosity, aeolotropy, and heterogeneity. There are relatively few studies on the crack propagation law of porous media under local loads It is still controversial whether the evolution law of surface cracks in briquette samples can be used to characterize the surface crack evolution of coal samples under the same external conditions, and few scholars carry out relevant research. Erefore, in order to study the difference of crack evolution laws of raw coal and briquette coal samples under external conditions, this paper adopts local load as stress condition and selects cube raw coal and briquette coal samples with preset center holes to make systematical analysis of differences in laws presented by the two kinds of samples from perspectives of local features, crack initiation stress and position, maximum effective instantaneous penetration rate, etc
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