Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect
Abstract The cracks formed by the breaking and collapse of the overlying strata are the oxygen supply channels for the continuous combustion of coal fires. The development of cracks is of great significance for determining the scope of the fire area and controlling the fire efficiently and accuratel...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2023-05-01
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| Series: | Energy Science & Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ese3.1420 |
| _version_ | 1827950505634037760 |
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| author | Hongqing Zhu Rongxiang Gao Lintao Hu Baolin Qu Qi Liao Haoran Wang Mingfu Fu |
| author_facet | Hongqing Zhu Rongxiang Gao Lintao Hu Baolin Qu Qi Liao Haoran Wang Mingfu Fu |
| author_sort | Hongqing Zhu |
| collection | DOAJ |
| description | Abstract The cracks formed by the breaking and collapse of the overlying strata are the oxygen supply channels for the continuous combustion of coal fires. The development of cracks is of great significance for determining the scope of the fire area and controlling the fire efficiently and accurately. To study the development law of cracks, a breaking model of the overlying strata in the shallow coal seam fire area is established on the basis of beam theory considering the coupling effect of gravity load and temperature field. The physical model of the coal fire is established based on the similarity principle. The temperature data from rock strata in the model are monitored by the infrared thermal imager. The dynamic distribution function of the roof temperature field is obtained by fitting. According to the breaking model theory, the position of the maximum tensile stress on the roof of the shallow fire area is the middle of the lower surface. The theoretical calculation value of the first breaking distance of the roof is 0.575 m, which is consistent with the experimental results of the physical model. The maximum tensile stress of the roof under the thermal‐mechanical coupling is slightly less than that under the load only. For shallow coal seams, the thermal stress generated by the coal fire increases the first breaking distance of the roof. |
| first_indexed | 2024-04-09T13:26:33Z |
| format | Article |
| id | doaj.art-93dc52447bec4db7a399c417cd7f971c |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-04-09T13:26:33Z |
| publishDate | 2023-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-93dc52447bec4db7a399c417cd7f971c2023-05-10T07:56:55ZengWileyEnergy Science & Engineering2050-05052023-05-011151770178210.1002/ese3.1420Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effectHongqing Zhu0Rongxiang Gao1Lintao Hu2Baolin Qu3Qi Liao4Haoran Wang5Mingfu Fu6School of Emergency Management and Safety Engineering China University of Mining and Technology – Beijing Beijing ChinaSchool of Emergency Management and Safety Engineering China University of Mining and Technology – Beijing Beijing ChinaSchool of Emergency Management and Safety Engineering China University of Mining and Technology – Beijing Beijing ChinaSchool of Emergency Management and Safety Engineering China University of Mining and Technology – Beijing Beijing ChinaSchool of Emergency Management and Safety Engineering China University of Mining and Technology – Beijing Beijing ChinaDepartment of Automation Tsinghua University Beijing ChinaSchool of Emergency Management and Safety Engineering China University of Mining and Technology – Beijing Beijing ChinaAbstract The cracks formed by the breaking and collapse of the overlying strata are the oxygen supply channels for the continuous combustion of coal fires. The development of cracks is of great significance for determining the scope of the fire area and controlling the fire efficiently and accurately. To study the development law of cracks, a breaking model of the overlying strata in the shallow coal seam fire area is established on the basis of beam theory considering the coupling effect of gravity load and temperature field. The physical model of the coal fire is established based on the similarity principle. The temperature data from rock strata in the model are monitored by the infrared thermal imager. The dynamic distribution function of the roof temperature field is obtained by fitting. According to the breaking model theory, the position of the maximum tensile stress on the roof of the shallow fire area is the middle of the lower surface. The theoretical calculation value of the first breaking distance of the roof is 0.575 m, which is consistent with the experimental results of the physical model. The maximum tensile stress of the roof under the thermal‐mechanical coupling is slightly less than that under the load only. For shallow coal seams, the thermal stress generated by the coal fire increases the first breaking distance of the roof.https://doi.org/10.1002/ese3.1420breaking modeloverlying stratashallow coal seam firesimilar experimentthermal stress |
| spellingShingle | Hongqing Zhu Rongxiang Gao Lintao Hu Baolin Qu Qi Liao Haoran Wang Mingfu Fu Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect Energy Science & Engineering breaking model overlying strata shallow coal seam fire similar experiment thermal stress |
| title | Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect |
| title_full | Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect |
| title_fullStr | Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect |
| title_full_unstemmed | Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect |
| title_short | Breaking law of overlying strata in shallow coal seam fire area under thermal–mechanical coupling effect |
| title_sort | breaking law of overlying strata in shallow coal seam fire area under thermal mechanical coupling effect |
| topic | breaking model overlying strata shallow coal seam fire similar experiment thermal stress |
| url | https://doi.org/10.1002/ese3.1420 |
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