Modeling the Speed‐Induced Key Block Motion and Support Resistance in Longwall Mining With a Multilayer Hard Roof: Insights From the Xiaojihan Coal Mine.
Saved in:
| Title: | Modeling the Speed‐Induced Key Block Motion and Support Resistance in Longwall Mining With a Multilayer Hard Roof: Insights From the Xiaojihan Coal Mine. |
|---|---|
| Authors: | Gao, Hui1 (AUTHOR), Duan, Xiaopeng2 (AUTHOR) duanxiaopeng@cumt.edu.cn, Wang, Xufeng2,3 (AUTHOR), Xie, Yuanman1 (AUTHOR), Liu, Enqiang1 (AUTHOR), Chen, Xuyang2 (AUTHOR), Qian, Chenlong2 (AUTHOR), Mishra, Pramita (AUTHOR) pmishra@wiley.com |
| Source: | Geofluids. 4/21/2026, Vol. 2026, p1-15. 15p. |
| Subject Terms: | *Longwall mining, *Ground control (Mining), *Coal mining, *Roof design & construction |
| Abstract: | To theoretically explain and quantify the effect of advancing speed (ADS) on ground pressure (GP) behavior, the 13,218 working face of the Xiaojihan Coal Mine (XCM) was taken as the engineering case. Field measurements and theoretical analysis were combined to examine how changes in ADS influence the roof structure and the support resistance. Considering the motion characteristics of key blocks, a calculation model for support resistance under multilayer thick hard roofs was established, incorporating the ADS factor. The results show that the overlying roof behaves as a composite system composed of a short cantilever beam and a voussoir beam structure, where the periodic fracture of the voussoir beam is the dominant cause of periodic weighting. When the ADS is accelerated from 5 to 15 m/day, the periodic weighting interval (PWI) grows by 29.1%, while the subsidence, rotation angle, and subsidence duration of key block C decrease by 39.1%, 53.5%, and 57.0%, respectively. The horizontal thrust between blocks increases by 31.6%, and the support resistance decreases by 7.9%. Comparison with field data (11,467–13,852 kN) shows the model predictions (11,549–13,757 kN) agree within 5%, verifying its reliability and applicability. The findings provide theoretical guidance for the optimization of advancing parameters and offer practical reference for GP control and safe, high‐intensity mining under multilayer hard roof conditions. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| FullText | Links: – Type: pdflink Text: Availability: 1 |
|---|---|
| Header | DbId: enr DbLabel: Energy & Power Source An: 193139729 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Modeling the Speed‐Induced Key Block Motion and Support Resistance in Longwall Mining With a Multilayer Hard Roof: Insights From the Xiaojihan Coal Mine. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gao%2C+Hui%22">Gao, Hui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Duan%2C+Xiaopeng%22">Duan, Xiaopeng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> duanxiaopeng@cumt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Xufeng%22">Wang, Xufeng</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xie%2C+Yuanman%22">Xie, Yuanman</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Enqiang%22">Liu, Enqiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Xuyang%22">Chen, Xuyang</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qian%2C+Chenlong%22">Qian, Chenlong</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mishra%2C+Pramita%22">Mishra, Pramita</searchLink> (AUTHOR)<i> pmishra@wiley.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geofluids%22">Geofluids</searchLink>. 4/21/2026, Vol. 2026, p1-15. 15p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Longwall+mining%22">Longwall mining</searchLink><br />*<searchLink fieldCode="DE" term="%22Ground+control+%28Mining%29%22">Ground control (Mining)</searchLink><br />*<searchLink fieldCode="DE" term="%22Coal+mining%22">Coal mining</searchLink><br />*<searchLink fieldCode="DE" term="%22Roof+design+%26+construction%22">Roof design & construction</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: To theoretically explain and quantify the effect of advancing speed (ADS) on ground pressure (GP) behavior, the 13,218 working face of the Xiaojihan Coal Mine (XCM) was taken as the engineering case. Field measurements and theoretical analysis were combined to examine how changes in ADS influence the roof structure and the support resistance. Considering the motion characteristics of key blocks, a calculation model for support resistance under multilayer thick hard roofs was established, incorporating the ADS factor. The results show that the overlying roof behaves as a composite system composed of a short cantilever beam and a voussoir beam structure, where the periodic fracture of the voussoir beam is the dominant cause of periodic weighting. When the ADS is accelerated from 5 to 15 m/day, the periodic weighting interval (PWI) grows by 29.1%, while the subsidence, rotation angle, and subsidence duration of key block C decrease by 39.1%, 53.5%, and 57.0%, respectively. The horizontal thrust between blocks increases by 31.6%, and the support resistance decreases by 7.9%. Comparison with field data (11,467–13,852 kN) shows the model predictions (11,549–13,757 kN) agree within 5%, verifying its reliability and applicability. The findings provide theoretical guidance for the optimization of advancing parameters and offer practical reference for GP control and safe, high‐intensity mining under multilayer hard roof conditions. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=193139729 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1155/gfl/9391896 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 1 Subjects: – SubjectFull: Longwall mining Type: general – SubjectFull: Ground control (Mining) Type: general – SubjectFull: Coal mining Type: general – SubjectFull: Roof design & construction Type: general Titles: – TitleFull: Modeling the Speed‐Induced Key Block Motion and Support Resistance in Longwall Mining With a Multilayer Hard Roof: Insights From the Xiaojihan Coal Mine. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gao, Hui – PersonEntity: Name: NameFull: Duan, Xiaopeng – PersonEntity: Name: NameFull: Wang, Xufeng – PersonEntity: Name: NameFull: Xie, Yuanman – PersonEntity: Name: NameFull: Liu, Enqiang – PersonEntity: Name: NameFull: Chen, Xuyang – PersonEntity: Name: NameFull: Qian, Chenlong – PersonEntity: Name: NameFull: Mishra, Pramita IsPartOfRelationships: – BibEntity: Dates: – D: 21 M: 04 Text: 4/21/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 14688115 Numbering: – Type: volume Value: 2026 Titles: – TitleFull: Geofluids Type: main |
| ResultId | 1 |
