Theoretical and Numerical Analysis of Stress Evolution and Structural Stability in Inclined Coal Seams Using Roof-Cutting and Non-Pillar Mining Methods.
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| Title: | Theoretical and Numerical Analysis of Stress Evolution and Structural Stability in Inclined Coal Seams Using Roof-Cutting and Non-Pillar Mining Methods. |
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| Authors: | Zhen, Enze1 (AUTHOR), Luo, Jun2 (AUTHOR), Wang, Tingting1,3 (AUTHOR), Dong, Shizhuo3,4 (AUTHOR), Wang, Yajun1,4 (AUTHOR) yyajun1990@163.com |
| Source: | Energies (19961073). Feb2026, Vol. 19 Issue 4, p920. 24p. |
| Subject Terms: | *Structural stability, *Mining methodology, *Stress concentration, *Scientific method, *Computer simulation |
| Abstract: | Stress evolution during overburden stabilization in non-pillar mining with roof-cutting and roadway formation (NMRRF) in inclined coal seams is highly complex due to the combined influence of seam dip angle and mining method. This study investigates the spatial stress evolution and structural stability of the overburden through numerical simulation and theoretical analysis. Results indicate that along the strike direction, the peak abutment pressure ahead of the working face decreases from the lower to the upper sections. As mining advances, the peak in the lower section shifts significantly forward, whereas changes in the middle and upper sections remain minimal. After advancing 150 m, upward expansion of the pressure-relief zone ceases, with the relief height in the lower goaf being smaller than that in the upper region. Along the dip direction, a pressure-relief zone forms in the roof and floor after 30 m of advancement, while stress concentration zones develop in the coal on both sides. With continued mining, the highest point of the pressure-relief zone gradually deviates from the central axis toward the upper section and eventually stabilizes within deeper strata at a certain distance from the axis. By 150 m of advancement, the relief zone peaks in the upper-middle section of the working face, and the height of the caved zone in the upper goaf exceeds that in the middle and lower parts. An asymmetric "inverted J-shaped" stress shell forms along the working face centerline, evolving into an overall asymmetric stress shell with its apex located in the upper goaf. A mechanical model of the overburden structure is established, yielding an expression for the three-dimensional stress shell morphology. Based on the stability mechanism of overburden movement and the failure modes of key block structures, support strategies for the mining face are proposed. The findings provide theoretical insights for non-pillar mining under similar geological conditions. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 191973340 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Theoretical and Numerical Analysis of Stress Evolution and Structural Stability in Inclined Coal Seams Using Roof-Cutting and Non-Pillar Mining Methods. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhen%2C+Enze%22">Zhen, Enze</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Luo%2C+Jun%22">Luo, Jun</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Tingting%22">Wang, Tingting</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dong%2C+Shizhuo%22">Dong, Shizhuo</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yajun%22">Wang, Yajun</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<i> yyajun1990@163.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Feb2026, Vol. 19 Issue 4, p920. 24p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Structural+stability%22">Structural stability</searchLink><br />*<searchLink fieldCode="DE" term="%22Mining+methodology%22">Mining methodology</searchLink><br />*<searchLink fieldCode="DE" term="%22Stress+concentration%22">Stress concentration</searchLink><br />*<searchLink fieldCode="DE" term="%22Scientific+method%22">Scientific method</searchLink><br />*<searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Stress evolution during overburden stabilization in non-pillar mining with roof-cutting and roadway formation (NMRRF) in inclined coal seams is highly complex due to the combined influence of seam dip angle and mining method. This study investigates the spatial stress evolution and structural stability of the overburden through numerical simulation and theoretical analysis. Results indicate that along the strike direction, the peak abutment pressure ahead of the working face decreases from the lower to the upper sections. As mining advances, the peak in the lower section shifts significantly forward, whereas changes in the middle and upper sections remain minimal. After advancing 150 m, upward expansion of the pressure-relief zone ceases, with the relief height in the lower goaf being smaller than that in the upper region. Along the dip direction, a pressure-relief zone forms in the roof and floor after 30 m of advancement, while stress concentration zones develop in the coal on both sides. With continued mining, the highest point of the pressure-relief zone gradually deviates from the central axis toward the upper section and eventually stabilizes within deeper strata at a certain distance from the axis. By 150 m of advancement, the relief zone peaks in the upper-middle section of the working face, and the height of the caved zone in the upper goaf exceeds that in the middle and lower parts. An asymmetric "inverted J-shaped" stress shell forms along the working face centerline, evolving into an overall asymmetric stress shell with its apex located in the upper goaf. A mechanical model of the overburden structure is established, yielding an expression for the three-dimensional stress shell morphology. Based on the stability mechanism of overburden movement and the failure modes of key block structures, support strategies for the mining face are proposed. The findings provide theoretical insights for non-pillar mining under similar geological conditions. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/en19040920 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 920 Subjects: – SubjectFull: Structural stability Type: general – SubjectFull: Mining methodology Type: general – SubjectFull: Stress concentration Type: general – SubjectFull: Scientific method Type: general – SubjectFull: Computer simulation Type: general Titles: – TitleFull: Theoretical and Numerical Analysis of Stress Evolution and Structural Stability in Inclined Coal Seams Using Roof-Cutting and Non-Pillar Mining Methods. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhen, Enze – PersonEntity: Name: NameFull: Luo, Jun – PersonEntity: Name: NameFull: Wang, Tingting – PersonEntity: Name: NameFull: Dong, Shizhuo – PersonEntity: Name: NameFull: Wang, Yajun IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 02 Text: Feb2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 19961073 Numbering: – Type: volume Value: 19 – Type: issue Value: 4 Titles: – TitleFull: Energies (19961073) Type: main |
| ResultId | 1 |
