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Editorial highlights risks from natural hazards during underground mining, suggesting improved safety measures and technologies.
failure characteristics of sandstone samples under different freeze-thaw cycles were studied, and the dynamic mechanical characteristics and crack propagation law of sandstone under different freeze-thaw cycles were revealed. Guo et al. (Contribution 9) investigated the evolution characteristics of microseismic signals across four key dimensions-time, energy, space, and frequency-and quantitatively analyzes their interrelationships. They showed that both the multifractal parameter and spatial correlation length exhibit a clear upward trend prior to roof weighting and gradually decline after pressure release. Zhang et al. (Contribution 10) analyzed the technical problem of low degassing efficiency in high and low permeability coal seams in China. By adopting the drag-type staged fracturing process with double-packers and a single-slip, and combining it with methods such as the analysis of pump injection stress curve stages, gas extraction concentration analysis, and in-hole transient electromagnetic detection, the laws of fracture propagation and the mechanism of permeability modification are revealed.) investigated the coal thermal cracking and introduced an ultrasonic approach to evaluate the thermal cracking process. They revealed a positive correlation between crack opening and cumulative moisture desorption, as well as between crack expansion rates and moisture desorption rates. Guo et al. (Contribution 12) established theoretical and numerical model of fractured coal, and the interaction relationship among the stress of coal, seepage, and diffusion field of gas was explored. They stated that the stress field of coal affected the diffusion and seepage of coal bed methane by changing the porosity and permeability, and the migration of coal bed methane changed the effective stress and adsorption expansion stress, thus affecting the stress field of coal. Gao et al. (Contribution 13) investigated the fractal characteristics of acoustic emission signals during coal-rock rupture and their predictive significance for impact dynamic hazards. True triaxial loading/unloading tests were conducted on five coal-rock composites with varying coal-thickness ratios. They found that acoustic emission parameters exhibit stress-dependent behavior, growing slowly initially, stabilizing during stress-holding, and surging exponentially before peak stress, with ∼90% of cumulative energy released pre-destabilization. Wang et al. (Contribution 14) conducted a combined monitoring experiment of pressure stimulated currents and acoustic emission signals on coal samples under the coupled action of rheology and impact load. They revealed that the non-extensive statistical mechanics analysis indicates that pressure stimulated currents decay exhibits non-extensive characteristics, with a significant reduction in before impact failure, suggesting that parameter q can be used to assess coal mass stability. Ouyang et al. (Contribution 15) used KeyBERT network model and conducted a coupling analysis of six typical coal mine disaster cases in China between 2013 and 2023: gas explosions, water disasters, fires, roof collapses, coal dust incidents, and rockbursts. They developed a dualprevention mechanism integrating hidden danger investigation with safety risk classification control, and proposed an innovative "3LA" coal mine disaster management system.Mining under natural hazard conditions will intensify due to the occurrence of associated hazards, old mining, goafs, edges, and geological disturbances. Therefore, further research will focus on the use of modern construction materials for the support of mine workings exposed to dynamic loads, as well as on the use of autonomous mining machines capable of operating in rock masses at very high temperatures and with the presence of asphyxiating, toxic, and explosive gases.Not applicable.Not applicable.
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Feng et al. (2026) studied this question.
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