Research on the pore structure and gas adsorption/desorption characteristics of tectonic coal in minor fault zone: Implications for coal and gas outbursts

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-25 DOI:10.1016/j.powtec.2025.120846

Shangkun Shen , Haifeng Wang , Tianwei Ren , Zhiyuan Wang

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Abstract

Minor faults, widely prevalent as small-scale tectonism in mining work face, are one of the important factors influencing coal and gas outbursts (CGO). This paper examined the pore structure, gas adsorption and desorption characteristics of coal samples at varying distances from fault and analyzed their interrelationships. The results show that fault has a significant effect on modifying mesopore and macropore, with a lesser effect on micropore. As distance from the fault decreases, there is an increasing trend in the gas's maximum adsorption volume, desorption rate, desorption volume, expansion energy and initial emission speed. Micropore is not the sole factor influencing gas adsorption, coal mineral composition or other factors also affect gas adsorption performance, while mesopore and macropore control gas desorption characteristics. Powdering significantly enhances gas expansion energy, with gas expansion energy in 0.074–0.2 mm being 7.19 times that of 1-3 mm, greatly increasing the risk of CGO. The influence range of the hanging wall is 17.35 m, which is 1.16 times that of the footwall, indicating a notably stronger modification effect of the fault on the hanging wall. The research results reveal the mechanism of how minor fault affects the microphysical structure and macroscopic adsorption and desorption characteristics on outburst coal seams, providing a foundation for the prevention and control of CGO in coal seams containing minor faults.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.