An experimental study on mechanical properties and fracturing characteristics of granite under high-temperature heating and liquid nitrogen cooling cyclic treatment

Xue, Yi; Li, Xue; Liu, Jia; Ranjith, P.G.; Gao, Feng; Cai, Chengzheng; Xie, Heping; Cao, Zhengzheng

doi:10.1016/j.geoen.2024.212816

Cited by 26 publications

(2 citation statements)

References 39 publications

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“…Especially for different mining methods in the same working face, the reasonable working resistance of hydraulic support directly affects the control effect of roof. Its adaptability and reliability are the key factors to determine whether the working face can achieve safe and efficient production 33 – 35 . Based on the selection of hydraulic support and three-machine supporting equipment, the working resistance of hydraulic support, the characteristics of mine pressure and the adaptability of support are analyzed, which is helpful to promote the scientific, efficient and safe production of mine.…”

Section: Adaptability Of Hydraulic Supportmentioning

confidence: 99%

Research on overburden structural characteristics and support adaptability in cooperative mining of sectional coal pillar and bottom coal seam

Feng,

Xuan,

Zhenhua

et al. 2024

Sci Rep

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In the mining process of the II1 coal seam at Zhaogu No. 2 coal mine, a method of stratified mining is employed, leaving relatively wide coal pillars in sections. To enhance the resource recovery rate, the mine carries out the cooperative mining of the sectional coal pillars and the lower layer coal seam. The 14,022 cooperative working face of fully-mechanized and fully-mechanized top-coal caving at Zhaogu No. 2 coal mine is taken as the research object. Through numerical simulation, theoretical calculations, and on-site industrial trials, a comprehensive analysis of the overburden structural characteristics and the support adaptability at the working face is conducted. It is clarified that a stress arch bearing structure can be formed above the sectional coal pillars during cooperative mining, and this structure is controlled by key strata. The formation of a stress arch bearing structure in the overburden above the sectional coal pillars provides protection for the underlying mining area. A formula for calculating the working resistance of hydraulic supports under the stress arch in sectional coal pillar is derived. Based on these results, the working resistance of hydraulic supports in the coal pillar area is calculated and selected. Field application shows that the working resistance of the support is 10,000 kN in the fully-mechanized top-coal caving working face, and is 9000 kN in fully-mechanized working face, meeting the support requirements and ensuring safe mining at the working face. This study provides a valuable engineering reference for achieving cooperative mining of abandoned sectional coal pillars and lower layer coal seam in stratified mining method.

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Section: Adaptability Of Hydraulic Supportmentioning

confidence: 99%

Research on overburden structural characteristics and support adaptability in cooperative mining of sectional coal pillar and bottom coal seam

Feng,

Xuan,

Zhenhua

et al. 2024

Sci Rep

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“… The equation of state is 28 , 29 : where and are the porosity and mass density corresponding to the reference pressure , and is the isothermal compression coefficient of the fluid. is the pore compression coefficient.…”

Section: Control Equation Of Nonlinear Seepage Characteristicsmentioning

confidence: 99%

Nonlinear evolution characteristics and seepage mechanical model of fluids in broken rock mass based on the bifurcation theory

Yunlong,

Zhengzheng,

Zhenhua

et al. 2024

Sci Rep

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With the deep extension of coal mining in China, fault water inrush has become one of the major disasters threatening the safety production of coal mine. Based on the control equations of steady state and non-Darcy seepage in fractured rock mass, the multi-parameter nonlinear dynamic seepage equations of fractured rock mass are established in this paper. Based on the nonlinear dynamics theory, the function of the state variable in the system is derived, and the influence of the gradual change of non-Darcy flow factors on the structural stability of seepage system is studied. The research achievements show that there are three branches in the equilibrium state of the seepage system. Specifically, the stability of the equilibrium state changes abruptly near the limit parameter. The seepage dynamic system of fractured rock mass has the delayed bifurcation, and the coal mine disaster such as fault water inrush occurs easily at the bifurcation point. The research results are of great significance to enrich the theory of fault water inrush in coal mine, and to reveal the disastrous mechanism of fault water inrush and guide its prevention and control technology in coal mine, which can provide the theoretical reference for predicting the water seepage stability in fractured rock mass.

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Hydrochemical characteristics, cross-layer pollution and environmental health risk of groundwater system in coal mine area: a case study of Jiangzhuang coal mine

Cheng,

Yin,

Dong

et al. 2024

Environ Geochem Health

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An experimental study on mechanical properties and fracturing characteristics of granite under high-temperature heating and liquid nitrogen cooling cyclic treatment

Cited by 26 publications

References 39 publications

Research on overburden structural characteristics and support adaptability in cooperative mining of sectional coal pillar and bottom coal seam

Research on overburden structural characteristics and support adaptability in cooperative mining of sectional coal pillar and bottom coal seam

Nonlinear evolution characteristics and seepage mechanical model of fluids in broken rock mass based on the bifurcation theory

Hydrochemical characteristics, cross-layer pollution and environmental health risk of groundwater system in coal mine area: a case study of Jiangzhuang coal mine

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