Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting
Hard roof top-cutting and gob-side roadway retention is an effective way to improve the panel recovery ratio and reduce ground pressure. Based on the condition of Pingmei No.2 Mine, this paper establishes a stability mechanics model for the roof in a trapezoidal top-cutting roadway with inclined coa...
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MDPI AG
2025-01-01
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| Online Access: | https://www.mdpi.com/2076-3417/15/1/348 |
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| author | Shizhong Zhang Chuangnan Ren Xinyao Gao Yongsheng Gao Lianyi Nie Shaodong Li Moulie Jiang |
| author_facet | Shizhong Zhang Chuangnan Ren Xinyao Gao Yongsheng Gao Lianyi Nie Shaodong Li Moulie Jiang |
| author_sort | Shizhong Zhang |
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| description | Hard roof top-cutting and gob-side roadway retention is an effective way to improve the panel recovery ratio and reduce ground pressure. Based on the condition of Pingmei No.2 Mine, this paper establishes a stability mechanics model for the roof in a trapezoidal top-cutting roadway with inclined coal seam, in order to analyze the factors influencing the stability of the roof. This paper studies the deformation characteristics and control mechanism of the surrounding rock in a trapezoidal top-cutting roadway, and proposes targeted stability control technologies for the surrounding rock. The results showed that: (1) in a trapezoidal top-cutting roadway in the hard roof with inclined coal seam, the tensile stress of the uncut roof was inversely proportional to the coal seam dip angle, roof thickness and top-cutting height, while it was proportional to the top-cutting angle. According to actual engineering conditions, the top-cutting angle and height of the roof of the 21,100-panel were determined to be 10° and 5.0 m, respectively; (2) the special structure of the trapezoidal roadway led to asymmetric stress distribution in the surrounding rock, especially in the roof and rib. Using top-cutting, the pressure relief reduced the roof stress from 6.73 MPa to 2.04 MPa, the high stress zone moved to the inside of the solid coal, and the roof slid and deformed along the top line, showing characteristics of a “large deformation on the top side”; and (3) high-strength long anchor cables were used to reinforce the roof on the cut top side. Telescopic U-shaped steel and windshield cloth were used to block gangue and prevent wind leakage in the roadway. The on-site industrial test measured the maximum subsidence of the roof at 120 mm, and the maximum layer separation was 29 mm. Relative to non-top-cutting methods, the roof and sides showed significantly reduced deformation throughout the mining operations, which verified the reliability of the control technology. |
| format | Article |
| id | doaj-art-13f1c85b22424094ba23d7f635439c3e |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-13f1c85b22424094ba23d7f635439c3e2025-01-10T13:15:15ZengMDPI AGApplied Sciences2076-34172025-01-0115134810.3390/app15010348Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof CuttingShizhong Zhang0Chuangnan Ren1Xinyao Gao2Yongsheng Gao3Lianyi Nie4Shaodong Li5Moulie Jiang6School 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, ChinaSchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaNo.2 Coal Mine, Pingdingshan Tian’an Coal Mining Co., Ltd., Pingdingshan 467000, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaHard roof top-cutting and gob-side roadway retention is an effective way to improve the panel recovery ratio and reduce ground pressure. Based on the condition of Pingmei No.2 Mine, this paper establishes a stability mechanics model for the roof in a trapezoidal top-cutting roadway with inclined coal seam, in order to analyze the factors influencing the stability of the roof. This paper studies the deformation characteristics and control mechanism of the surrounding rock in a trapezoidal top-cutting roadway, and proposes targeted stability control technologies for the surrounding rock. The results showed that: (1) in a trapezoidal top-cutting roadway in the hard roof with inclined coal seam, the tensile stress of the uncut roof was inversely proportional to the coal seam dip angle, roof thickness and top-cutting height, while it was proportional to the top-cutting angle. According to actual engineering conditions, the top-cutting angle and height of the roof of the 21,100-panel were determined to be 10° and 5.0 m, respectively; (2) the special structure of the trapezoidal roadway led to asymmetric stress distribution in the surrounding rock, especially in the roof and rib. Using top-cutting, the pressure relief reduced the roof stress from 6.73 MPa to 2.04 MPa, the high stress zone moved to the inside of the solid coal, and the roof slid and deformed along the top line, showing characteristics of a “large deformation on the top side”; and (3) high-strength long anchor cables were used to reinforce the roof on the cut top side. Telescopic U-shaped steel and windshield cloth were used to block gangue and prevent wind leakage in the roadway. The on-site industrial test measured the maximum subsidence of the roof at 120 mm, and the maximum layer separation was 29 mm. Relative to non-top-cutting methods, the roof and sides showed significantly reduced deformation throughout the mining operations, which verified the reliability of the control technology.https://www.mdpi.com/2076-3417/15/1/348hard rooftrapezoidal roadwaycutting top to retain roadwaystability of surrounding rockcontrol technology |
| spellingShingle | Shizhong Zhang Chuangnan Ren Xinyao Gao Yongsheng Gao Lianyi Nie Shaodong Li Moulie Jiang Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting Applied Sciences hard roof trapezoidal roadway cutting top to retain roadway stability of surrounding rock control technology |
| title | Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting |
| title_full | Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting |
| title_fullStr | Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting |
| title_full_unstemmed | Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting |
| title_short | Stability and Control of Surrounding Rock of a Trapezoidal Roadway Retained with Hard Roof Cutting |
| title_sort | stability and control of surrounding rock of a trapezoidal roadway retained with hard roof cutting |
| topic | hard roof trapezoidal roadway cutting top to retain roadway stability of surrounding rock control technology |
| url | https://www.mdpi.com/2076-3417/15/1/348 |
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