Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation
With the increasing depth of mining operations and the emergence of complex geological conditions, pneumatic down-the-hole (DTH) hammers have become an efficient drilling technology. This method utilizes high-pressure air to drive hammering actions for rock fragmentation. However, the layout and dur...
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MDPI AG
2025-03-01
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| Online Access: | https://www.mdpi.com/2076-3417/15/7/3649 |
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| author | Jing Zhou Kunkun Li Hao Wu Yuan Dong Bairu Xia |
| author_facet | Jing Zhou Kunkun Li Hao Wu Yuan Dong Bairu Xia |
| author_sort | Jing Zhou |
| collection | DOAJ |
| description | With the increasing depth of mining operations and the emergence of complex geological conditions, pneumatic down-the-hole (DTH) hammers have become an efficient drilling technology. This method utilizes high-pressure air to drive hammering actions for rock fragmentation. However, the layout and durability of tungsten carbide buttons significantly affect the rate of penetration (ROP). This study focuses on optimizing the button arrangement for large-diameter reverse circulation pneumatic DTH hammers to improve drilling efficiency. A numerical model incorporating zero-thickness cohesive elements was developed to simulate rock fracturing. A comparative analysis of 16 mm and 22 mm buttons under varying drilling pressures (1–1.8 kN) and impact energies (20–40 J) was conducted. Key metrics, including penetration depth, fragmentation range, stress-affected zone, and specific energy consumption, were analyzed. The results indicate that 22 mm buttons under 35 J impact energy and 1.4 kN drilling pressure exhibit superior performance, with optimal circumferential (47.2 mm) and radial (51.2 mm) spacing determined through stress superposition analysis. This configuration enhances the weakened rock strength zone, providing critical guidance for DTH hammer design. |
| format | Article |
| id | doaj-art-ac299baa40bc4d9084b50cae683a2884 |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-ac299baa40bc4d9084b50cae683a28842025-08-20T02:09:18ZengMDPI AGApplied Sciences2076-34172025-03-01157364910.3390/app15073649Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite FormationJing Zhou0Kunkun Li1Hao Wu2Yuan Dong3Bairu Xia4School of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaSecond Exploration Bureau of China Coal Geology Administration, Beijing 100083, ChinaSinochem General Administration of Geology and Mines, Guizhou Institute of Geological Exploration, Guiyang 550003, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaWith the increasing depth of mining operations and the emergence of complex geological conditions, pneumatic down-the-hole (DTH) hammers have become an efficient drilling technology. This method utilizes high-pressure air to drive hammering actions for rock fragmentation. However, the layout and durability of tungsten carbide buttons significantly affect the rate of penetration (ROP). This study focuses on optimizing the button arrangement for large-diameter reverse circulation pneumatic DTH hammers to improve drilling efficiency. A numerical model incorporating zero-thickness cohesive elements was developed to simulate rock fracturing. A comparative analysis of 16 mm and 22 mm buttons under varying drilling pressures (1–1.8 kN) and impact energies (20–40 J) was conducted. Key metrics, including penetration depth, fragmentation range, stress-affected zone, and specific energy consumption, were analyzed. The results indicate that 22 mm buttons under 35 J impact energy and 1.4 kN drilling pressure exhibit superior performance, with optimal circumferential (47.2 mm) and radial (51.2 mm) spacing determined through stress superposition analysis. This configuration enhances the weakened rock strength zone, providing critical guidance for DTH hammer design.https://www.mdpi.com/2076-3417/15/7/3649percussive drillingimpact energygranitedrill bit impactnumerical simulation |
| spellingShingle | Jing Zhou Kunkun Li Hao Wu Yuan Dong Bairu Xia Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation Applied Sciences percussive drilling impact energy granite drill bit impact numerical simulation |
| title | Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation |
| title_full | Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation |
| title_fullStr | Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation |
| title_full_unstemmed | Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation |
| title_short | Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation |
| title_sort | numerical simulation of rock breaking mechanism by spherical tooth impact in granite formation |
| topic | percussive drilling impact energy granite drill bit impact numerical simulation |
| url | https://www.mdpi.com/2076-3417/15/7/3649 |
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