Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

Wang, Hanpeng; Zhang, Bing; Yuan, Liang; Yu, Guofeng; Wang, Wei

doi:10.3390/en11102661

Cited by 10 publications

(8 citation statements)

References 31 publications

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“…High stress may lock in the gas energy before detection and disturbance; high stress does not necessarily mean a high gas content or pressure, but high gas generally means high stress, making stress the triggering and inducing factor of coal and gas outbursts. All of this provides energy storage conditions and dynamic conditions for coal and gas outbursts [39].…”

Section: Quantitative Relationship Between Development Of Stress and Coalmentioning

confidence: 99%

The Relationship between Mining-Induced Stress and Coal Gas under an Optimized Support Scheme: A Case Study in the Guanyinshan Coal Mine, China

Zhang

Chen

et al. 2021

Geofluids

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Stress is one of the main factors influencing coal and gas outbursts. The apparent effects of the crustal stress, the structural stress, and the mining-induced stress increase as the depth of mining increases. At present, there have been few studies of the relationship between the comprehensive analyses of the crustal stress, mining-induced stress, and coal gas. The in situ measurement of the relationship between stress-related behaviors and coal gas under the influence of mining was conducted through experimental analysis of surrounding rock support and coal and gas outburst control and optimization of surrounding rock support materials and system construction. The results showed that the mining-induced stress first increased to a peak value, then gradually decreased, and tended to stabilize as the footage progresses. Stress appears at 96 m ahead due to mining; after 57 m of advancing, there is a large increase until it passes through this area. The stress in front of the working face increases linearly, and the increase range is obviously larger than that of the coal body in a certain range on both sides. The support anchoring force gradually decreased and tended to be stable after rapidly increasing to a maximum value. The deep displacement of the roof increased linearly and tended to be stable after reaching an accumulated displacement which can reach 16-28 mm. The residual gas pressure in front of mining operations decreased rapidly, and beyond 15 m on each side of the roadway, it decreased significantly. The residual gas pressure and gas content were consistent with the gas desorption index of drill cuttings due to the influences of gas predrainage and mining. The stress along the direction of the roadway and the residual gas content, the residual gas pressure, and the gas desorption index of drill cuttings conform to the logarithmic functional relationship. The research results provide a basis for the comprehensive prevention and control of coal and gas outbursts from multiple angles considering stress, coal, and gas.

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Section: Quantitative Relationship Between Development Of Stress and Coalmentioning

confidence: 99%

The Relationship between Mining-Induced Stress and Coal Gas under an Optimized Support Scheme: A Case Study in the Guanyinshan Coal Mine, China

Zhang

Chen

et al. 2021

Geofluids

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“…Han obtained geostress characteristics in outburst mining areas through an analysis of measured data and discussed the role of geostress in gas outbursts. Wang proved through experiments that the change in gas release intensity caused by the change in the in situ stress is essential in inducing coal and gas outbursts . Furthermore, air pressure can change the mechanical properties of coal, which leads to higher air pressure, greater released energy, , and higher outburst intensity.…”

Section: Introductionmentioning

confidence: 99%

“…Wang proved through experiments that the change in gas release intensity caused by the change in the in situ stress is essential in inducing coal and gas outbursts. 6 Furthermore, air pressure can change the mechanical properties of coal, 7 which leads to higher air pressure, greater released energy, 8 , 9 and higher outburst intensity. Jia 3 combined the characteristics of coal and gas outbursts in this area, discussed the influence of structural stress fields on the geological structure distribution, gas storage, and structural coal development, and further studied the influence of structural stress fields on coal and gas outbursts.…”

Section: Introductionmentioning

confidence: 99%

Discussion on the Main Control Effect of Geological Structures on Coal and Gas Outburst

et al. 2022

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Coal and gas outbursts are great natural disasters in underground coal mines, seriously threatening the lives of miners and coal mine safety. The study of the relationship between coal and gas outbursts and geological structures has always been an important component of gas geological work, and it also serves as a foundation for coal mines to develop gas outburst prevention measures. This study considers groups F and E coal seams, mainly mined in the southwest wing of Likou syncline in the Pingdingshan mining area, as the research object. Based on actual outburst data, this study investigates the distribution and intensity characteristics of coal and gas outbursts and the correlation between coal and gas outbursts and geological structures using gas geological analysis methods and taking structural control as the main line. The results depict that the coal and gas outbursts in the study area have obvious district and subband characteristics. The outburst district mainly occurred in the East, and the four outburst zones, I, II, III, and IV, were the concentrated occurrence subband of coal and gas outbursts. The district and subband of coal and gas outburst are mainly controlled by and related to the geological structure. The eastern fold structure has developed more than the middle and western districts, which is why the eastern part of the coal and gas outburst is more severe than in the middle and western regions. Under the structural background of the coal and gas outburst district, the subband outburst characteristics were mainly controlled by local geological structural conditions.

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“…The mechanical properties of coal and rock are of key importance in coal mining and exploration [1][2][3], rock strata control [4][5][6], hydraulic fracturing [7][8][9], rock burst [10,11], (enhanced) coal bed methane recovery (CBM/ECBM) [12], water hazard control [13,14], geo-sequestration [15,16], and underground coal gasification in coal mines and deep unmineable coal seams [17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Heterogeneous Properties of Coal and Rock Quantified and Mapped at the Microscale

Sun

Zhang

et al. 2020

Applied Sciences

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Due to the impossibility of obtaining intact standard experimental samples, it is difficult to test the mechanical properties of soft and broken coal and rock obtained from deep coal mines. So, an advanced experimental technology based on a small sample volume, nanoindentation technology, was introduced and used to measure the mechanical parameters of them. By using the averaging method, the hardness of shale, mudstone and coal are 1191.90 MPa, 674.95 MPa and 424.30 MPa, respectively; their elastic moduli are 20.39 GPa, 11.72 GPa and 5.47 GPa; and their fracture toughness were 1.66 MPa·m0.5, 1.28 MPa·m0.5 and 0.77 MPa·m0.5. These three mechanical parameters were used to quantify and map the heterogeneous properties of coal and rock for convenience and accuracy. For example, the inter quartile range (IQR) of the hardness of shale, mudstone, and coal are 1502.10 MPa, 1016.20 MPa and 54.64 MPa, respectively, meaning that coal has the best homogeneity among them. Nanoindentation technology provides researchers with a convenient method to conduct mechanical experiments at the microscale.

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Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

Cited by 10 publications

References 31 publications

The Relationship between Mining-Induced Stress and Coal Gas under an Optimized Support Scheme: A Case Study in the Guanyinshan Coal Mine, China

The Relationship between Mining-Induced Stress and Coal Gas under an Optimized Support Scheme: A Case Study in the Guanyinshan Coal Mine, China

Discussion on the Main Control Effect of Geological Structures on Coal and Gas Outburst

Mechanical and Heterogeneous Properties of Coal and Rock Quantified and Mapped at the Microscale

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