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Quantitative Characteristics of Energy Evolution of Gas-Bearing Coal Under Cyclic Loading and its Action Mechanisms on Coal and Gas Outburst.

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Title: Quantitative Characteristics of Energy Evolution of Gas-Bearing Coal Under Cyclic Loading and its Action Mechanisms on Coal and Gas Outburst.
Authors: Peng, Kang1,2 (AUTHOR), Shi, Shaowei1 (AUTHOR), Zou, Quanle1 (AUTHOR) quanlezou2016@cqu.edu.cn, Wen, Zhijie3 (AUTHOR) wenzhijie@sdust.edu.cn, Wang, Yunqiang1 (AUTHOR), Jiang, Zebiao4 (AUTHOR), Zheng, Chunshan5 (AUTHOR)
Source: Rock Mechanics & Rock Engineering. Jun2021, Vol. 54 Issue 6, p3115-3133. 19p.
Subjects: Gas bursts, Coal gas, Cyclic loads, Coal, Coal mining
Abstract: It is very important and effective to characterize the failure mechanism of coal and rock materials from the perspective of energy. Energy dissipation and release are important causes of rock mass failure. To qualitatively and quantitatively characterize the energy evolution process of gas-bearing coal and the energy evolution mechanisms of coal and gas outburst, experimental studies were conducted on gas-bearing coal under different stress paths. The research results demonstrate that the energy evolution of gas-bearing coal has nonlinear characteristics and that the energy density is a quadratic function of stress. The total energy density is mainly stored as elastic energy density and is unrelated to loading paths. According to the distribution characteristics of abutment pressures in a stope, the energy distribution can be divided into an energy dissipation and release zone, an increasing-energy zone, and a stable energy storage zone. During coal mining, abutment pressure in front of the coal wall is an important factor causing energy accumulation, and the stress concentration area is a key area to prevent and control dynamic disasters of coal and rock masses. Furthermore, based on the principle of energy conservation, this study established an energy balance model for coal and gas outburst and derived energy criteria for coal and gas outburst. When Υ > 1 , there is a risk of coal seams have outburst. If Υ = 1 , the system is in a state of limit equilibrium, and mining disturbances could trigger outburst. [ABSTRACT FROM AUTHOR]
Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Quantitative Characteristics of Energy Evolution of Gas-Bearing Coal Under Cyclic Loading and its Action Mechanisms on Coal and Gas Outburst.
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  Data: <searchLink fieldCode="JN" term="%22Rock+Mechanics+%26+Rock+Engineering%22">Rock Mechanics & Rock Engineering</searchLink>. Jun2021, Vol. 54 Issue 6, p3115-3133. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Gas+bursts%22">Gas bursts</searchLink><br /><searchLink fieldCode="DE" term="%22Coal+gas%22">Coal gas</searchLink><br /><searchLink fieldCode="DE" term="%22Cyclic+loads%22">Cyclic loads</searchLink><br /><searchLink fieldCode="DE" term="%22Coal%22">Coal</searchLink><br /><searchLink fieldCode="DE" term="%22Coal+mining%22">Coal mining</searchLink>
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  Data: It is very important and effective to characterize the failure mechanism of coal and rock materials from the perspective of energy. Energy dissipation and release are important causes of rock mass failure. To qualitatively and quantitatively characterize the energy evolution process of gas-bearing coal and the energy evolution mechanisms of coal and gas outburst, experimental studies were conducted on gas-bearing coal under different stress paths. The research results demonstrate that the energy evolution of gas-bearing coal has nonlinear characteristics and that the energy density is a quadratic function of stress. The total energy density is mainly stored as elastic energy density and is unrelated to loading paths. According to the distribution characteristics of abutment pressures in a stope, the energy distribution can be divided into an energy dissipation and release zone, an increasing-energy zone, and a stable energy storage zone. During coal mining, abutment pressure in front of the coal wall is an important factor causing energy accumulation, and the stress concentration area is a key area to prevent and control dynamic disasters of coal and rock masses. Furthermore, based on the principle of energy conservation, this study established an energy balance model for coal and gas outburst and derived energy criteria for coal and gas outburst. When Υ > 1 , there is a risk of coal seams have outburst. If Υ = 1 , the system is in a state of limit equilibrium, and mining disturbances could trigger outburst. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Cyclic loads
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      – TitleFull: Quantitative Characteristics of Energy Evolution of Gas-Bearing Coal Under Cyclic Loading and its Action Mechanisms on Coal and Gas Outburst.
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              Text: Jun2021
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