Study on mechanical and seepage characteristics of water-saturated coal under rapid cold and heat shock by liquid nitrogen freeze-thaw and microwave heat injection

Ma Heng; Hou Shuangrong; Qi Xiaohan; Wang Pin; Liu Yang; Wang Xiaoqi

doi:10.19606/j.cnki.jmst.2023.06.009

Volume 8 Issue 6

Dec. 2023

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Article Navigation > Journal of Mining Science and Technology > 2023 > 8(6): 828-837

Ma Heng, Hou Shuangrong, Qi Xiaohan, Wang Pin, Liu Yang, Wang Xiaoqi. Study on mechanical and seepage characteristics of water-saturated coal under rapid cold and heat shock by liquid nitrogen freeze-thaw and microwave heat injection[J]. Journal of Mining Science and Technology, 2023, 8(6): 828-837. doi: 10.19606/j.cnki.jmst.2023.06.009

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Study on mechanical and seepage characteristics of water-saturated coal under rapid cold and heat shock by liquid nitrogen freeze-thaw and microwave heat injection

doi: 10.19606/j.cnki.jmst.2023.06.009

College of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125100, China
Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education (Liaoning Technical University), Huludao Liaoning 125100, China

Received Date: 2023-05-22
Rev Recd Date: 2023-06-18
Publish Date: 2023-12-31

Abstract

Abstract

This study proposes to explore the coal mechanics and seepage characteristics under the coupling of water-saturation, freeze-thaw and different temperatures. The original coal of 9105 working face in Wangzhuang Coal Mine was taken as the research object, and non-contact digital image processing was used to carry out the triaxial loading test of the coal rock under the conditions of liquid nitrogen freeze-thaw and microwave heat injection. Results showed that: ① in the original coal samples after freeze-thaw, water-saturated, and water-saturated freeze-thaw conditions and gradient temperature treatment, there is increase in the compressive strength, modulus of elasticity, Poisson's ratio, and shear strain value of the coal rock; ② the original coal rock in the compression density, elasticity, yield and destruction of the four stages of the stress concentration phenomenon shows no obvious developmental changes, but by water-saturated, water-saturated freeze-thaw, water-saturated freezing and thawing conditions of 100 ℃ and 150 ℃ temperature treatment, the local stress of the specimen concentrates in the destruction phase with obvious amplification; ③ compared with the initial permeability of the original coal rock, the initial permeability of the coal sample underwent a small increase of 1.44×10^-3μm² after the liquid nitrogen freeze-thaw treatment. After the water-saturated liquid nitrogen freeze-thaw, water-saturated liquid nitrogen freeze-thaw treatment at 50 ℃ and 100 ℃, there is more significant increase in the initial permeability of the coal rock, and after the water-saturated liquid nitrogen freeze-thaw treatment at 150 ℃, the initial permeability of the coal sample underwent a significantly higher increase and reaches 7.40×10^-3μm². The study provide references for increasing the permeability of gas in deep low-permeability coal beds, which could improve the efficiency of downhole gas extraction.
- Non-contact digital image processing,
- triaxial loading,
- liquid nitrogen freezing and thawing,
- stress concentration,
- initial permeability

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References(25)

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Study on mechanical and seepage characteristics of water-saturated coal under rapid cold and heat shock by liquid nitrogen freeze-thaw and microwave heat injection

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