Investigation on micro-surface adhesion of coals and implications for gas occurrence and coal and gas outburst mechanism

Tian, Xianghui; Song, Dazhao; He, Xiaocong; Liu, Huifang; Wang, Weixiang

doi:10.1016/j.jngse.2021.104115

Cited by 27 publications

(14 citation statements)

References 69 publications

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“…The cool and warm colors in the figures correspond to high and low adhesion, modulus, and deformation, respectively. The inhomogeneous distribution of cool and warm mixing is shown in Figure S16 (Supporting Information), which indicates that the microscopic surface mechanics of FFCKK-8.0 exhibits nonuniformity . For example, in the DMT modulus channel, the maximum modulus of the sample is close to 160 GPa.…”

Section: Resultsmentioning

confidence: 99%

“…The inhomogeneous distribution of cool and warm mixing is shown in Figure S16 (Supporting Information), which indicates that the microscopic surface mechanics of FFCKK-8.0 exhibits nonuniformity. 73 For example, in the DMT modulus channel, the maximum modulus of the sample is close to 160 GPa. This is due to the weak mechanical properties of FFCKK-8.0, which collapsed during the drying process of the sample, and the probe was close to the substrate during the test to increase the modulus.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Mechanical Properties of Low-Molecular-Weight Peptide Hydrogels Improved by Thiol-Ene Click Chemistry

Xiong,

Hu,

Ding

et al. 2023

Langmuir

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Low-molecular-weight peptide hydrogels can be formed by self-assembly through weak interactions, but the application of the hydrogel is influenced by its weak mechanical properties. Therefore, it is important to construct low-molecularweight peptide hydrogels with excellent mechanical properties. In this work, we designed the pentapeptide molecule Fmoc-FFCKK-OH (abbreviated as FFCKK) with a sulfhydryl group, and another low-molecular-weight cross-linker N,N′-methylenebis(acrylamide) (MBA) was introduced to construct a hydrogel with excellent mechanical properties. The secondary structure change process of FFCKK and the assembly mechanism of hydrogel were analyzed using theoretical calculations and experimental characterizations. The occurrence of thiol-ene click chemistry provides covalent interaction in the hydrogel, and the synergistic effect ofcovalent interaction and hydrogen bonding improves the mechanical properties of the hydrogel by nearly 10-fold. The hydrogel was observed to be able to withstand a stress of 368 Pa and to break in a layer-by-layer manner by compression testing. The micromechanics of the hydrogels were characterized, and the excellent mechanical properties of the hydrogels were confirmed. The synergistic approach provides a new idea for the preparation of lowmolecular-weight peptide hydrogels and facilitates the expansion of their potential applications in biomedical fields.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanical Properties of Low-Molecular-Weight Peptide Hydrogels Improved by Thiol-Ene Click Chemistry

Xiong,

Hu,

Ding

et al. 2023

Langmuir

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“…During the coal and gas outburst process, the gas in the coal matrix pores desorbs rapidly and then flows to the roadway accompanied by coal powder, − which will cause damage to the antioutburst door, as shown in Figure . The influence factors of coal and gas outburst are numerous and complex, making it extremely difficult to predict and prevent. − …”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Impact of Coal and Gas Two-Phase Flow on the Antioutburst Door

Hu,

Nie,

et al. 2024

Energy Fuels

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As the primary antioutburst facility in underground coal mines, the antioutburst door will be severely destroyed under the impact of coal and gas outburst two-phase flow. To comprehensively investigate the mechanical response characteristics of the antioutburst door under coal and gas outburst twophase flow, the coal and gas outburst experiments were carried out using the self-designed device, and the simulation research was conducted using the ANSYS Workbench software. The results show that a large amount of coal powder pours into the roadway driven by the gas flow, with the patterns of suspension flow, stratified flow, and slug flow. Most of the coal powders accumulate in front of the first antioutburst door. When the antioutburst door is fixed around, the stress at the surrounding and middle area of the antioutburst door is the highest, and the displacement at the middle area of the antioutburst door is relatively large, resulting in the most severe deformation. Therefore, the antioutburst door can be divided into three regions, that is, the central area of the antioutburst door (Region I), indicating the weakest region; the middle part of the four sides (Region II), indicating the weaker region; and the remaining area (Region III), indicating the nonweak region. The research of this paper has certain significance for understanding the mechanical response characteristics of the antioutburst door under the impact of coal and gas outburst two-phase flow so as to optimize the structures of the antioutburst door.

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“…Coal is the dominant energy source in China, and it is expected to account for more than 50% of primary energy consumption by 2030, and coal will remain the basic energy to ensure China's energy security and stability [1,2]. China's main coal mining is underground mining method, and with the increase of mining depth, the risk of coal and gas protrusion increases [3][4][5][6][7]. To effectively control coal and gas outburst accidents, the national bureau of coal-mine safety issued Prevention and Control of Coal and Gas Outburst Conditions [8], emphasizing the prominent danger zone with the conditions of mining the protective layer, and mining the upper protective layer as a priority.…”

Section: Introductionmentioning

confidence: 99%

Study on Stress Evolution Law of Overburden under Repeated Mining in Long-Distance Double Upper Protective Layer

Fang

Sun

et al. 2022

Energies

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Upper protective seam mining has been widely applied in China, but the theory of long-distance multiple upper protective seam mining is not yet perfect. In order to investigate the overburden stress evolution law of repetitive mining of long-distance coal seam groups, an experimental study was conducted to simulate similar materials under repeated mining conditions in the long-distance double upper protective layer in the background of Pingmei Group 8th coal mine. By analyzing the roof-collapse structure and the stress evolution law of different layers of the floor during the superposition mining, the pressure-relief range of the protective layer after the mining of the double upper protective layer was determined. The study results showed that: the pressure relief of the protective layer in the long-distance upper protective layer mining was a dynamic process. After the mining of Group D coal seam, the maximum impact depth of the bottom plate could reach 182 m, and the pressure-relief angle of the upper side of Group E coal seam was 65°, and the pressure-relief angle of the lower side was 75°. The distance behind the vertical projection of the working face of Group D was 42 m. The overlapping back mining would affect the stress distribution of Group F coal seam. The pressure-relief angle of the upper side of Group F coal seam was 88°, and the pressure-relief angle of the lower side was greater than 78°. The distance behind the vertical projection of the working face of Group E was less than 61 m. The superposition and staggered mining of double protective layers could expand the protective layer. Through the verification of the measurement of gas parameters on site, it can be seen from the results that it has a certain protection effect. The research results can enrich the theory of long-distance multiple upper protective layer mining, and provide theoretical guidance for long-distance Coal Seam Group Mining in Pingmei coal-mine area.

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Investigation on micro-surface adhesion of coals and implications for gas occurrence and coal and gas outburst mechanism

Cited by 27 publications

References 69 publications

Mechanical Properties of Low-Molecular-Weight Peptide Hydrogels Improved by Thiol-Ene Click Chemistry

Mechanical Properties of Low-Molecular-Weight Peptide Hydrogels Improved by Thiol-Ene Click Chemistry

Experimental and Numerical Study on the Impact of Coal and Gas Two-Phase Flow on the Antioutburst Door

Study on Stress Evolution Law of Overburden under Repeated Mining in Long-Distance Double Upper Protective Layer

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