Experimental study on the mechanical behavior of high-stress rocks during real-time drilling
Abstract The formation of a pressure relief zone is crucial for rockbust prevention during drilling pressure relief. This study investigates the mechanical behavior of high-stress rock under real-time drilling conditions and elucidates the mechanism behind the creation of the pressure relief zone. U...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-04-01
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| Series: | International Journal of Coal Science & Technology |
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| Online Access: | https://doi.org/10.1007/s40789-025-00774-5 |
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| author | Zhichao He Fengqiang Gong Mingzhong Gao |
| author_facet | Zhichao He Fengqiang Gong Mingzhong Gao |
| author_sort | Zhichao He |
| collection | DOAJ |
| description | Abstract The formation of a pressure relief zone is crucial for rockbust prevention during drilling pressure relief. This study investigates the mechanical behavior of high-stress rock under real-time drilling conditions and elucidates the mechanism behind the creation of the pressure relief zone. Utilizing the independently developed SG4500 drilling rig, we conducted a theoretical analysis of the forces acting on the drill bit. The analysis showed that cutting depth is directly proportional to real-time drilling speed, while tangential and normal forces are influenced by drilling diameter. Uniaxial compression tests on red sandstone specimens under high-stress real-time drilling conditions examined the impacts of different drilling speeds (800, 400, 100 r/min) and diameters (6, 8, 10, 12 mm) on rock mechanical behavior, rockburst characteristics, crack evolution, and peak elastic strain energy. The results indicate that decreasing drilling speed and increasing drilling diameter weaken rock mechanical behavior, including peak strength, Young’s modulus, rockburst characteristics, and peak elastic strain energy. Crack evolution analysis reveals that smaller drilling diameters and higher drilling speeds promote the development of far-field cracks, while larger drilling diameters and lower drilling speeds lead to crack formation around the borehole, and significantly affecting rock failure mechanisms. Theoretical analysis further confirms the correlation between crack evolution and stress distribution surrounding the drilling. Under vertical stress, the cracks near the borehole formed during real-time drilling are mainly influenced by tangential compressive and tensile stresses. Overall, this study provides a new perspective on understanding the mechanisms of drilling pressure relief for rockburst prevention. |
| format | Article |
| id | doaj-art-bb986a808ce548aa9b79fddb5e80d012 |
| institution | DOAJ |
| issn | 2095-8293 2198-7823 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Coal Science & Technology |
| spelling | doaj-art-bb986a808ce548aa9b79fddb5e80d0122025-08-20T03:14:02ZengSpringerOpenInternational Journal of Coal Science & Technology2095-82932198-78232025-04-0112112310.1007/s40789-025-00774-5Experimental study on the mechanical behavior of high-stress rocks during real-time drillingZhichao He0Fengqiang Gong1Mingzhong Gao2School of Civil Engineering, Southeast UniversitySchool of Civil Engineering, Southeast UniversityGuangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Shenzhen UniversityAbstract The formation of a pressure relief zone is crucial for rockbust prevention during drilling pressure relief. This study investigates the mechanical behavior of high-stress rock under real-time drilling conditions and elucidates the mechanism behind the creation of the pressure relief zone. Utilizing the independently developed SG4500 drilling rig, we conducted a theoretical analysis of the forces acting on the drill bit. The analysis showed that cutting depth is directly proportional to real-time drilling speed, while tangential and normal forces are influenced by drilling diameter. Uniaxial compression tests on red sandstone specimens under high-stress real-time drilling conditions examined the impacts of different drilling speeds (800, 400, 100 r/min) and diameters (6, 8, 10, 12 mm) on rock mechanical behavior, rockburst characteristics, crack evolution, and peak elastic strain energy. The results indicate that decreasing drilling speed and increasing drilling diameter weaken rock mechanical behavior, including peak strength, Young’s modulus, rockburst characteristics, and peak elastic strain energy. Crack evolution analysis reveals that smaller drilling diameters and higher drilling speeds promote the development of far-field cracks, while larger drilling diameters and lower drilling speeds lead to crack formation around the borehole, and significantly affecting rock failure mechanisms. Theoretical analysis further confirms the correlation between crack evolution and stress distribution surrounding the drilling. Under vertical stress, the cracks near the borehole formed during real-time drilling are mainly influenced by tangential compressive and tensile stresses. Overall, this study provides a new perspective on understanding the mechanisms of drilling pressure relief for rockburst prevention.https://doi.org/10.1007/s40789-025-00774-5Rock mechanicsRockburstDrilling pressure reliefReal-time drillingCrack evolutionRockburst proneness |
| spellingShingle | Zhichao He Fengqiang Gong Mingzhong Gao Experimental study on the mechanical behavior of high-stress rocks during real-time drilling International Journal of Coal Science & Technology Rock mechanics Rockburst Drilling pressure relief Real-time drilling Crack evolution Rockburst proneness |
| title | Experimental study on the mechanical behavior of high-stress rocks during real-time drilling |
| title_full | Experimental study on the mechanical behavior of high-stress rocks during real-time drilling |
| title_fullStr | Experimental study on the mechanical behavior of high-stress rocks during real-time drilling |
| title_full_unstemmed | Experimental study on the mechanical behavior of high-stress rocks during real-time drilling |
| title_short | Experimental study on the mechanical behavior of high-stress rocks during real-time drilling |
| title_sort | experimental study on the mechanical behavior of high stress rocks during real time drilling |
| topic | Rock mechanics Rockburst Drilling pressure relief Real-time drilling Crack evolution Rockburst proneness |
| url | https://doi.org/10.1007/s40789-025-00774-5 |
| work_keys_str_mv | AT zhichaohe experimentalstudyonthemechanicalbehaviorofhighstressrocksduringrealtimedrilling AT fengqianggong experimentalstudyonthemechanicalbehaviorofhighstressrocksduringrealtimedrilling AT mingzhonggao experimentalstudyonthemechanicalbehaviorofhighstressrocksduringrealtimedrilling |