On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

Yang, Mingzheng; Xie, Heping; Gao, Mingzhong; He, Zhiqiang; Liu, Cong; Xie, Jing; Lu, Yongmei; Yang, Bohan

doi:10.2298/tsci2006923y

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Qu et al 28 investigated the stability of rock slope under the stress-seepage-temperature-chemical coupling condition and obtained the parameter change rules including stress, temperature, deformation, and damage. Yang et al 29 analyzed the influences of the stress and temperature fields on the seepage field under the deep coal mining condition and revealed that the temperature field has a significant influence on the adsorbed gas in the seepage field.…”

Section: Introductionmentioning

confidence: 99%

The nonlocal thermo‐hydro‐mechanical model for cracking behaviors of quasi‐brittle materials in the framework of advanced general particle dynamics

Zhou

Yao

et al. 2023

Fatigue Fract Eng Mat Struct

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A novel nonlocal thermo-hydro-mechanical coupling model is proposed to investigate cracking behaviors of quasi-brittle materials in the framework of advanced general particle dynamics (GPD). The nonlocal thermal conduction equation and the nonlocal flow diffusion equation are derived based on nonlocal vector calculus and the microscopic constitutive equation. Moreover, the coupling influences are considered based on the nonlocal equation and the coupling principle. The governing equation of the coupling system is established in the framework of GPD. The correctness of the proposed model is verified through comparing with the corresponding experimental data, and the numerical results are in good agreement with experimental results. Finally, the proposed model is applied to analyze the deformation and cracking behaviors of rock mass around tunnels, and the stress redistribution is revealed under thermo-hydro-mechanical coupling condition. K E Y W O R D S advanced general particle dynamics, cracking and mechanical behaviors of rock-like materials, nonlocal thermo-hydro-mechanical coupling model, nonlocal vector calculus Highlights • A novel nonlocal thermo-hydro-mechanical coupling model is proposed to investigate the cracking behaviors of rocks. • The nonlocal thermal conduction equation and the nonlocal flow diffusion equation are derived. • The governing equation of the coupling system is established in the framework of advanced general particle dynamics.

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Section: Introductionmentioning

confidence: 99%

The nonlocal thermo‐hydro‐mechanical model for cracking behaviors of quasi‐brittle materials in the framework of advanced general particle dynamics

Zhou

Yao

et al. 2023

Fatigue Fract Eng Mat Struct

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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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“…Meanwhile, the gas pressure and gas content in coal seam also increase. All the factors interact and influence each other, and the gas disaster becomes more and more serious [2][3][4]. e traditional protective layer mining method of the coal seam encounters great challenges.…”

Section: Introductionmentioning

confidence: 99%

Mining‐Induced Pressure‐Relief Mechanism of Coal‐Rock Mass for Different Protective Layer Mining Modes

Cheng

Zhao

et al. 2021

Advances in Materials Science and Engineering

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The protective layer mining method of the traditional deep coal seam in has been confronted with great challenges, and it is difficult for coal and gas to be extracted together. Taking the occurrence conditions of III1 mining area of Luling Coal Mine located at Huaibei, China, as engineering background, the influence law of the lithology on stress environment in front of the stope was analyzed by theoretical analysis and numerical simulations. The mining-induced mechanical effect of coal-rock mass was studied under different protective layer mining modes. The results showed that the peak value of the advanced abutment pressure decreased with the decrease of lithologic strength under the same mining conditions. For simulated geological conditions, the stress concentration coefficient of soft rock and coal seam protective layer mining modes was 1.9 and 1.7, respectively. Under the mining stress path of different protective layers, the ratio of axial stress increase and confining pressure unloading in secondary unloading phase were 2 : 1 and 1.5 : 1, respectively. The axial stress-strain curves of different protective layer mining modes had similar trends, and they had a volume expansion at the end of unloading (failure stage). In addition, it revealed the pressure-relief antireflection mechanism of the protective layer mining. Under the same confining pressure condition, the peak stress and peak strain increased with the increase of loading and unloading velocity ratio. The reduced value of the confining pressure increased, while the volume expansion decreased at failure. The results were applied to III1 mining area in soft rock protective layer mining, which created the mining way of traditional coal seam protective layer. Furthermore, the gas control technology of soft rock protective layer working face was put forward for deep coal seam with low permeability and high gas, enriching the pressure-relief mining theory of protective layer.

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On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

Cited by 7 publications

References 14 publications

The nonlocal thermo‐hydro‐mechanical model for cracking behaviors of quasi‐brittle materials in the framework of advanced general particle dynamics

The nonlocal thermo‐hydro‐mechanical model for cracking behaviors of quasi‐brittle materials in the framework of advanced general particle dynamics

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

Mining‐Induced Pressure‐Relief Mechanism of Coal‐Rock Mass for Different Protective Layer Mining Modes

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