Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study
Pre-driven longwall retracement roadway (PLRR) is commonly used in large mine shaft. The support crushing disasters occur frequently during the retracement, and roof management is necessary. Taking the 31107 panel as research background, the roof breaking structure of PLRR is analyzed. It is conclud...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | International Journal of Mining Science and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268621001063 |
| _version_ | 1828766143482953728 |
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| author | Feiteng Zhang Xiangyu Wang Jianbiao Bai Wenda Wu Bowen Wu Guanghui Wang |
| author_facet | Feiteng Zhang Xiangyu Wang Jianbiao Bai Wenda Wu Bowen Wu Guanghui Wang |
| author_sort | Feiteng Zhang |
| collection | DOAJ |
| description | Pre-driven longwall retracement roadway (PLRR) is commonly used in large mine shaft. The support crushing disasters occur frequently during the retracement, and roof management is necessary. Taking the 31107 panel as research background, the roof breaking structure of PLRR is analyzed. It is concluded that the roof cutting with vertical hydraulic fracture (HF) at a specified position, that is, fixed-length roof cutting, can reduce support load and keep immediate roof intact. The extended finite element method (XFEM) is applied to simulate hydraulic fracturing. The results show that both the axial and transverse hydraulic fracturing cannot effectively create vertical HFs. Therefore, a novel construction method of vertical HF based on the stress shadow effect (SSE) is proposed. The stress reversal region and HF orientation caused by the prefabricated hydraulic fracture (PF) are verified in simulation. The sub-vertical HFs are obtained between two PFs, the vertical extension range of which is much larger than that of directional hydraulic fracturing. The new construction method was used to determine the field plan for fixed-length roof cutting. The roof formed a stable suspended structure and deformation of the main PLRR was improved after hydraulic fracturing. |
| first_indexed | 2024-12-11T06:59:58Z |
| format | Article |
| id | doaj.art-3bf4ab90749f475aa58510eb5237d270 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-12-11T06:59:58Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-3bf4ab90749f475aa58510eb5237d2702022-12-22T01:16:38ZengElsevierInternational Journal of Mining Science and Technology2095-26862022-03-01322295308Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case studyFeiteng Zhang0Xiangyu Wang1Jianbiao Bai2Wenda Wu3Bowen Wu4Guanghui Wang5School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining & Technology, Xuzhou 221116, China; Corresponding author.State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaPre-driven longwall retracement roadway (PLRR) is commonly used in large mine shaft. The support crushing disasters occur frequently during the retracement, and roof management is necessary. Taking the 31107 panel as research background, the roof breaking structure of PLRR is analyzed. It is concluded that the roof cutting with vertical hydraulic fracture (HF) at a specified position, that is, fixed-length roof cutting, can reduce support load and keep immediate roof intact. The extended finite element method (XFEM) is applied to simulate hydraulic fracturing. The results show that both the axial and transverse hydraulic fracturing cannot effectively create vertical HFs. Therefore, a novel construction method of vertical HF based on the stress shadow effect (SSE) is proposed. The stress reversal region and HF orientation caused by the prefabricated hydraulic fracture (PF) are verified in simulation. The sub-vertical HFs are obtained between two PFs, the vertical extension range of which is much larger than that of directional hydraulic fracturing. The new construction method was used to determine the field plan for fixed-length roof cutting. The roof formed a stable suspended structure and deformation of the main PLRR was improved after hydraulic fracturing.http://www.sciencedirect.com/science/article/pii/S2095268621001063Roof cuttingHydraulic fractureStress shadow effectRetracement roadwayExtended finite element method |
| spellingShingle | Feiteng Zhang Xiangyu Wang Jianbiao Bai Wenda Wu Bowen Wu Guanghui Wang Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study International Journal of Mining Science and Technology Roof cutting Hydraulic fracture Stress shadow effect Retracement roadway Extended finite element method |
| title | Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study |
| title_full | Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study |
| title_fullStr | Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study |
| title_full_unstemmed | Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study |
| title_short | Fixed-length roof cutting with vertical hydraulic fracture based on the stress shadow effect: A case study |
| title_sort | fixed length roof cutting with vertical hydraulic fracture based on the stress shadow effect a case study |
| topic | Roof cutting Hydraulic fracture Stress shadow effect Retracement roadway Extended finite element method |
| url | http://www.sciencedirect.com/science/article/pii/S2095268621001063 |
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