Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams
Abstract Coal, a vital strategic resource, facilitates industrial development and socio-economic progress. Ensuring the high-quality development of the coal industry is crucial for national energy security and safety. Coal and gas outbursts are frequent hazards in coal mining processes. This researc...
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Nature Portfolio
2024-11-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-80588-8 |
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| author | Dongbin Huang Xiangtao Kang Zuhao Xu Chao Ren Yongyan Long Ping Cao |
| author_facet | Dongbin Huang Xiangtao Kang Zuhao Xu Chao Ren Yongyan Long Ping Cao |
| author_sort | Dongbin Huang |
| collection | DOAJ |
| description | Abstract Coal, a vital strategic resource, facilitates industrial development and socio-economic progress. Ensuring the high-quality development of the coal industry is crucial for national energy security and safety. Coal and gas outbursts are frequent hazards in coal mining processes. This research delves into the impact of heterogeneous coal seam strength on hydraulic fracturing propagation, utilizing both physical experimentation and the ABAQUS finite element approach. Experimental findings reveal distinct variations in water injection pressure profiles and fracturing fluid distribution patterns within coal seams of varying strengths, in contrast to those exhibiting uniform strength. When fractures propagate from a weaker to stronger coal seam region, a notable increase in pressure build-up effect is observed, leading to higher water injection pressure, wider fracture widths, augmented coal body displacement, and an elevated rate of rigidity reduction. In this study, the physical test results and numerical simulation results are verified with each other. After fractures propagate across the interface, zone with higher coal seam strength experience decreased fracture width, lower coal body displacement, and slower rates of rigidity decline compared to weaker seam zone. When fractures propagate from high to low coal seam areas, the fracture experiences instantaneous cross-boundary extension, resulting in a decrease in pore pressure, increased coal body displacement, and an elevated rate of rigidity decline. |
| format | Article |
| id | doaj-art-a73ae19d9ef344baacccdb05b106900b |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-a73ae19d9ef344baacccdb05b106900b2025-08-20T02:22:20ZengNature PortfolioScientific Reports2045-23222024-11-0114111710.1038/s41598-024-80588-8Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seamsDongbin Huang0Xiangtao Kang1Zuhao Xu2Chao Ren3Yongyan Long4Ping Cao5College of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityCollege of Mining, Guizhou UniversityAbstract Coal, a vital strategic resource, facilitates industrial development and socio-economic progress. Ensuring the high-quality development of the coal industry is crucial for national energy security and safety. Coal and gas outbursts are frequent hazards in coal mining processes. This research delves into the impact of heterogeneous coal seam strength on hydraulic fracturing propagation, utilizing both physical experimentation and the ABAQUS finite element approach. Experimental findings reveal distinct variations in water injection pressure profiles and fracturing fluid distribution patterns within coal seams of varying strengths, in contrast to those exhibiting uniform strength. When fractures propagate from a weaker to stronger coal seam region, a notable increase in pressure build-up effect is observed, leading to higher water injection pressure, wider fracture widths, augmented coal body displacement, and an elevated rate of rigidity reduction. In this study, the physical test results and numerical simulation results are verified with each other. After fractures propagate across the interface, zone with higher coal seam strength experience decreased fracture width, lower coal body displacement, and slower rates of rigidity decline compared to weaker seam zone. When fractures propagate from high to low coal seam areas, the fracture experiences instantaneous cross-boundary extension, resulting in a decrease in pore pressure, increased coal body displacement, and an elevated rate of rigidity decline.https://doi.org/10.1038/s41598-024-80588-8Strength heterogeneityHydraulic fracturingOut-of-bounds expansionNumerical simulationFracture propagation characteristics |
| spellingShingle | Dongbin Huang Xiangtao Kang Zuhao Xu Chao Ren Yongyan Long Ping Cao Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams Scientific Reports Strength heterogeneity Hydraulic fracturing Out-of-bounds expansion Numerical simulation Fracture propagation characteristics |
| title | Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams |
| title_full | Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams |
| title_fullStr | Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams |
| title_full_unstemmed | Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams |
| title_short | Influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams |
| title_sort | influence of strength inhomogeneity on transboundary expansion characteristics of hydraulically fractured fractures in coal seams |
| topic | Strength heterogeneity Hydraulic fracturing Out-of-bounds expansion Numerical simulation Fracture propagation characteristics |
| url | https://doi.org/10.1038/s41598-024-80588-8 |
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