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
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2023-12-01
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| Series: | 矿业科学学报 |
| Subjects: | |
| Online Access: | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.06.009 |
| _version_ | 1827763817464987648 |
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| author | Ma Heng Hou Shuangrong Qi Xiaohan Wang Pin Liu Yang Wang Xiaoqi |
| author_facet | Ma Heng Hou Shuangrong Qi Xiaohan Wang Pin Liu Yang Wang Xiaoqi |
| author_sort | Ma Heng |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T10:56:06Z |
| format | Article |
| id | doaj.art-432721f26c9a4a40a9646a1a7943c8a8 |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-03-11T10:56:06Z |
| publishDate | 2023-12-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-432721f26c9a4a40a9646a1a7943c8a82023-11-13T08:03:05ZengEmergency Management Press矿业科学学报2096-21932023-12-018682883710.19606/j.cnki.jmst.2023.06.009kykxxb-8-6-828Study on mechanical and seepage characteristics of water-saturated coal under rapid cold and heat shock by liquid nitrogen freeze-thaw and microwave heat injectionMa HengHou ShuangrongQi XiaohanWang PinLiu YangWang XiaoqiThis 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.http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.06.009non-contact digital image processingtriaxial loadingliquid nitrogen freezing and thawingstress concentrationinitial permeability |
| spellingShingle | 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 矿业科学学报 non-contact digital image processing triaxial loading liquid nitrogen freezing and thawing stress concentration initial permeability |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | non-contact digital image processing triaxial loading liquid nitrogen freezing and thawing stress concentration initial permeability |
| url | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.06.009 |
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