Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures
This experimental study probes into the evolution patterns of fine damage and mechanical and seepage characteristics of coal rocks using the coal rock triaxial servo experiment system by employing three types of pretreatment methods, namely heating, freeze-thawing with liquid nitrogen and freeze-tha...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2023-08-01
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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.2023.04.004 |
| _version_ | 1797804358448971776 |
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| author | Qi Xiaoghan Liu Yang Yang Xuesong Zhu Tongguang Wang Pin Hou Shuangrong |
| author_facet | Qi Xiaoghan Liu Yang Yang Xuesong Zhu Tongguang Wang Pin Hou Shuangrong |
| author_sort | Qi Xiaoghan |
| collection | DOAJ |
| description | This experimental study probes into the evolution patterns of fine damage and mechanical and seepage characteristics of coal rocks using the coal rock triaxial servo experiment system by employing three types of pretreatment methods, namely heating, freeze-thawing with liquid nitrogen and freeze-thawing with water, with an aim to investigate the effect of temperature on freeze-thaw damage and seepage characteristics of coal rocks.Results show that higher preheating temperature leads to more severe structural damage, damage to water-filled liquid nitrogen freeze-thawed coal samples at the same temperature is greater than that of liquid nitrogen freeze-thawed coal samples and heated coal samples only, the degree of damage is negatively correlated with the wave speed and positively correlated with the number of joint dimensions of the end face damage; coal samples with high triaxial compressive strength feature low pre-deformation under different pretreatment methods; all three pre-treatment methods lead to an increase in the number of internal pores and fractures in the coal sample, resulting in the formation of a network of fractures.Freezing and thawing the coal sample with warmed water and liquid nitrogen demonstrate more stronger effect than that of freezing and thawing with warmed liquid nitrogen only.Therefore, in engineering practice, preheating-water injection-liquid nitrogen injection freeze-thaw could be employed to achieve efficient coal seam penetration and improve the effect of gas extraction. |
| first_indexed | 2024-03-13T05:35:57Z |
| format | Article |
| id | doaj.art-d441785ac36940499181fa872cd6bda0 |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-03-13T05:35:57Z |
| publishDate | 2023-08-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-d441785ac36940499181fa872cd6bda02023-06-14T09:23:12ZengEmergency Management Press矿业科学学报2096-21932023-08-018447448610.19606/j.cnki.jmst.2023.04.004kykxxb-8-4-474Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperaturesQi Xiaoghan0Liu Yang1Yang Xuesong2Zhu Tongguang3Wang Pin4Hou Shuangrong5College of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, ChinaCollege of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, ChinaCollege of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, ChinaCollege of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, ChinaCollege of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, ChinaCollege of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125105, ChinaThis experimental study probes into the evolution patterns of fine damage and mechanical and seepage characteristics of coal rocks using the coal rock triaxial servo experiment system by employing three types of pretreatment methods, namely heating, freeze-thawing with liquid nitrogen and freeze-thawing with water, with an aim to investigate the effect of temperature on freeze-thaw damage and seepage characteristics of coal rocks.Results show that higher preheating temperature leads to more severe structural damage, damage to water-filled liquid nitrogen freeze-thawed coal samples at the same temperature is greater than that of liquid nitrogen freeze-thawed coal samples and heated coal samples only, the degree of damage is negatively correlated with the wave speed and positively correlated with the number of joint dimensions of the end face damage; coal samples with high triaxial compressive strength feature low pre-deformation under different pretreatment methods; all three pre-treatment methods lead to an increase in the number of internal pores and fractures in the coal sample, resulting in the formation of a network of fractures.Freezing and thawing the coal sample with warmed water and liquid nitrogen demonstrate more stronger effect than that of freezing and thawing with warmed liquid nitrogen only.Therefore, in engineering practice, preheating-water injection-liquid nitrogen injection freeze-thaw could be employed to achieve efficient coal seam penetration and improve the effect of gas extraction.http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.04.004liquid nitrogen freezing and thawingtriaxial loadinga closer look damageseepagetranslucency |
| spellingShingle | Qi Xiaoghan Liu Yang Yang Xuesong Zhu Tongguang Wang Pin Hou Shuangrong Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures 矿业科学学报 liquid nitrogen freezing and thawing triaxial loading a closer look damage seepage translucency |
| title | Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures |
| title_full | Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures |
| title_fullStr | Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures |
| title_full_unstemmed | Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures |
| title_short | Experimental study on freeze-thaw damage and seepage characteristics of coal rock at different prefabrication temperatures |
| title_sort | experimental study on freeze thaw damage and seepage characteristics of coal rock at different prefabrication temperatures |
| topic | liquid nitrogen freezing and thawing triaxial loading a closer look damage seepage translucency |
| url | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2023.04.004 |
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