Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification
Floor failure in deep coal mining above confined aquifers with high-water pressure may induce floor water inrush disasters. Considering the effects of mining stress and nonuniformly distributed water pressure, a mechanical calculation model of the island longwall panel in up-dip mining was establish...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/1851899 |
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| _version_ | 1832564782628077568 |
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| author | Pengpeng Wang Yixin Zhao Qingshan Ren Yaodong Jiang Cun Zhang Yirui Gao |
| author_facet | Pengpeng Wang Yixin Zhao Qingshan Ren Yaodong Jiang Cun Zhang Yirui Gao |
| author_sort | Pengpeng Wang |
| collection | DOAJ |
| description | Floor failure in deep coal mining above confined aquifers with high-water pressure may induce floor water inrush disasters. Considering the effects of mining stress and nonuniformly distributed water pressure, a mechanical calculation model of the island longwall panel in up-dip mining was established, and the stress distribution and floor failure characteristics were analyzed. The failure characteristics of the floor at NO. 2129 panel in Xingdong coal mine were detected by the borehole televiewer and microseismic monitoring system to validate the theoretical model. The results indicated that the floor failure characteristics along the strike and inclination of the island longwall panel in up-dip mining were “asymmetric inverted saddle-shaped” and “spoon-shaped,” respectively. The maximum floor failure depths before and after roof hydraulic fracturing (RHF) were 45.7 m and 29.1 m, respectively. The theoretical calculation results of the maximum depths of floor failure were 45.1 m and 29.9 m, respectively. The theoretical failure characteristics were consistent with those measured on site. The stress concentration magnitude and floor failure depth on the side of the isolated coal pillar were greater than those of other areas, and the water-inrush-prone zones were concentrated on the side of the isolated coal pillar near the intersection of the working face and the roadway. The research results could provide a certain reference for floor failure and water inrush mechanisms under complex geological conditions in deep mining. |
| format | Article |
| id | doaj-art-d8322d9fe5d047509976147fc4031202 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-d8322d9fe5d047509976147fc40312022025-02-03T01:10:19ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/1851899Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field VerificationPengpeng Wang0Yixin Zhao1Qingshan Ren2Yaodong Jiang3Cun Zhang4Yirui Gao5Beijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesBeijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesBeijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesBeijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesBeijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesBeijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesFloor failure in deep coal mining above confined aquifers with high-water pressure may induce floor water inrush disasters. Considering the effects of mining stress and nonuniformly distributed water pressure, a mechanical calculation model of the island longwall panel in up-dip mining was established, and the stress distribution and floor failure characteristics were analyzed. The failure characteristics of the floor at NO. 2129 panel in Xingdong coal mine were detected by the borehole televiewer and microseismic monitoring system to validate the theoretical model. The results indicated that the floor failure characteristics along the strike and inclination of the island longwall panel in up-dip mining were “asymmetric inverted saddle-shaped” and “spoon-shaped,” respectively. The maximum floor failure depths before and after roof hydraulic fracturing (RHF) were 45.7 m and 29.1 m, respectively. The theoretical calculation results of the maximum depths of floor failure were 45.1 m and 29.9 m, respectively. The theoretical failure characteristics were consistent with those measured on site. The stress concentration magnitude and floor failure depth on the side of the isolated coal pillar were greater than those of other areas, and the water-inrush-prone zones were concentrated on the side of the isolated coal pillar near the intersection of the working face and the roadway. The research results could provide a certain reference for floor failure and water inrush mechanisms under complex geological conditions in deep mining.http://dx.doi.org/10.1155/2022/1851899 |
| spellingShingle | Pengpeng Wang Yixin Zhao Qingshan Ren Yaodong Jiang Cun Zhang Yirui Gao Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification Geofluids |
| title | Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification |
| title_full | Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification |
| title_fullStr | Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification |
| title_full_unstemmed | Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification |
| title_short | Floor Failure Characteristics in Deep Island Longwall Panel: Theoretical Analysis and Field Verification |
| title_sort | floor failure characteristics in deep island longwall panel theoretical analysis and field verification |
| url | http://dx.doi.org/10.1155/2022/1851899 |
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