Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining
Roof cutting by dense drilling is one of the main methods of gob-side entry retaining. Taking the 203 working face of the Ruineng Coal Mine as the engineering background, a mechanical model is established to clarify the roof breaking mechanism. Numerical simulation is conducted to analyze the roof c...
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MDPI AG
2025-03-01
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| author | Ding Lang Shuaiming Chen Hongping Yuan Jiandong Yu Yang Yu Shenghu Luo Bosheng Hu Panshi Xie |
| author_facet | Ding Lang Shuaiming Chen Hongping Yuan Jiandong Yu Yang Yu Shenghu Luo Bosheng Hu Panshi Xie |
| author_sort | Ding Lang |
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| description | Roof cutting by dense drilling is one of the main methods of gob-side entry retaining. Taking the 203 working face of the Ruineng Coal Mine as the engineering background, a mechanical model is established to clarify the roof breaking mechanism. Numerical simulation is conducted to analyze the roof cutting effects of different parameters, and reasonable roof cutting parameters are identified. The results show that: ① The increase in roof cutting height is beneficial to roof cutting, but excessive height will cause stress concentration of the ‘key structure’ on the side of the coal pillar. ② It is difficult to cut off the roof when the roof cutting angle is too small, and the cantilever length of the roof increases when the roof cutting angle is too large. ③ The larger the borehole spacing, the smaller the plastic penetration rate between boreholes. The optimal parameters of roof cutting are determined as follows: roof cutting height 8 m; roof cutting angle 15°; aperture size 48 mm; hole spacing at 200 mm. The deformation of the resulting roadway is controllable, indicating that the key parameter determination method is effective. |
| format | Article |
| id | doaj-art-d88f02707c394a55acbb0bc193340430 |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-d88f02707c394a55acbb0bc1933404302025-08-20T02:52:35ZengMDPI AGApplied Sciences2076-34172025-03-01155268510.3390/app15052685Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar MiningDing Lang0Shuaiming Chen1Hongping Yuan2Jiandong Yu3Yang Yu4Shenghu Luo5Bosheng Hu6Panshi Xie7School of Energy and Mining Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy and Mining Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaShaanxi Ruineng Coal Industry Co., Ltd. Yan’an 716000, ChinaShaanxi Ruineng Coal Industry Co., Ltd. Yan’an 716000, ChinaShaanxi Ruineng Coal Industry Co., Ltd. Yan’an 716000, ChinaSchool of Energy and Mining Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy and Mining Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy and Mining Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaRoof cutting by dense drilling is one of the main methods of gob-side entry retaining. Taking the 203 working face of the Ruineng Coal Mine as the engineering background, a mechanical model is established to clarify the roof breaking mechanism. Numerical simulation is conducted to analyze the roof cutting effects of different parameters, and reasonable roof cutting parameters are identified. The results show that: ① The increase in roof cutting height is beneficial to roof cutting, but excessive height will cause stress concentration of the ‘key structure’ on the side of the coal pillar. ② It is difficult to cut off the roof when the roof cutting angle is too small, and the cantilever length of the roof increases when the roof cutting angle is too large. ③ The larger the borehole spacing, the smaller the plastic penetration rate between boreholes. The optimal parameters of roof cutting are determined as follows: roof cutting height 8 m; roof cutting angle 15°; aperture size 48 mm; hole spacing at 200 mm. The deformation of the resulting roadway is controllable, indicating that the key parameter determination method is effective.https://www.mdpi.com/2076-3417/15/5/2685dense drillingroof cutting pressure reliefgob-side entry retainingkey parameters |
| spellingShingle | Ding Lang Shuaiming Chen Hongping Yuan Jiandong Yu Yang Yu Shenghu Luo Bosheng Hu Panshi Xie Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining Applied Sciences dense drilling roof cutting pressure relief gob-side entry retaining key parameters |
| title | Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining |
| title_full | Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining |
| title_fullStr | Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining |
| title_full_unstemmed | Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining |
| title_short | Study of Reasonable Roof Cutting Parameters of Dense-Drilling Roof Cutting and Pressure Relief Self-Forming Roadway in Non-Pillar Mining |
| title_sort | study of reasonable roof cutting parameters of dense drilling roof cutting and pressure relief self forming roadway in non pillar mining |
| topic | dense drilling roof cutting pressure relief gob-side entry retaining key parameters |
| url | https://www.mdpi.com/2076-3417/15/5/2685 |
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