Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring
The evaluation of rock mass quality and its mechanical properties is crucial for tunnel construction. The basic quality (BQ) method is the national standard for rock mass classification in China, with the BQ value determined by the uniaxial compressive strength (UCS) and the integrity index (Kv). Ho...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775525000678 |
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| author | Xinfang Li Xiaoping Zhang Quansheng Liu Shaohui Tang Qi Zhang Yongbin Liu |
| author_facet | Xinfang Li Xiaoping Zhang Quansheng Liu Shaohui Tang Qi Zhang Yongbin Liu |
| author_sort | Xinfang Li |
| collection | DOAJ |
| description | The evaluation of rock mass quality and its mechanical properties is crucial for tunnel construction. The basic quality (BQ) method is the national standard for rock mass classification in China, with the BQ value determined by the uniaxial compressive strength (UCS) and the integrity index (Kv). However, traditional rock mechanics testing methods have inherent limitations, which complicate the rapid evaluation of rock mass quality at tunnel sites. Digital drilling process monitoring (DPM) offers a novel approach for evaluating rock mass quality and its mechanical properties. A hydraulic rotary drilling rig, equipped with the DPM system, was used to conduct digital drilling tests at the tunnel face. The DPM data for the net drilling process and each sub-process were then analyzed. The correlations between DPM parameter indices and rock mechanical parameters were investigated. Finally, the rock mass quality and its mechanical properties along three boreholes were evaluated. The results indicate that drilling speed in the linear zone (VDPM) is quantitatively correlated with rock UCS. Higher UCS values of the drilled rocks correspond to lower VDPM values of the drilling rig. The variability in specific energy is associated with structural disturbances within the rock mass. There is an approximately linear relationship between the standard deviation of normalized specific energy and rock mass Kv across the three boreholes. The rock mass quality along drilling depth generally ranges from good (Ⅰ-Ⅱ) to poor (Ⅲ-Ⅴ). This digitalization method provides more detailed information for tunnel stability analysis and design optimization than geological survey data. |
| format | Article |
| id | doaj-art-a5a64be26cce4edabedb88bac260a96d |
| institution | Matheson Library |
| issn | 1674-7755 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj-art-a5a64be26cce4edabedb88bac260a96d2025-07-12T04:46:08ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552025-07-0117744904511Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoringXinfang Li0Xiaoping Zhang1Quansheng Liu2Shaohui Tang3Qi Zhang4Yongbin Liu5Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, ChinaCorresponding author.; Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, ChinaKey Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, ChinaKey Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, ChinaKey Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, ChinaKey Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, ChinaThe evaluation of rock mass quality and its mechanical properties is crucial for tunnel construction. The basic quality (BQ) method is the national standard for rock mass classification in China, with the BQ value determined by the uniaxial compressive strength (UCS) and the integrity index (Kv). However, traditional rock mechanics testing methods have inherent limitations, which complicate the rapid evaluation of rock mass quality at tunnel sites. Digital drilling process monitoring (DPM) offers a novel approach for evaluating rock mass quality and its mechanical properties. A hydraulic rotary drilling rig, equipped with the DPM system, was used to conduct digital drilling tests at the tunnel face. The DPM data for the net drilling process and each sub-process were then analyzed. The correlations between DPM parameter indices and rock mechanical parameters were investigated. Finally, the rock mass quality and its mechanical properties along three boreholes were evaluated. The results indicate that drilling speed in the linear zone (VDPM) is quantitatively correlated with rock UCS. Higher UCS values of the drilled rocks correspond to lower VDPM values of the drilling rig. The variability in specific energy is associated with structural disturbances within the rock mass. There is an approximately linear relationship between the standard deviation of normalized specific energy and rock mass Kv across the three boreholes. The rock mass quality along drilling depth generally ranges from good (Ⅰ-Ⅱ) to poor (Ⅲ-Ⅴ). This digitalization method provides more detailed information for tunnel stability analysis and design optimization than geological survey data.http://www.sciencedirect.com/science/article/pii/S1674775525000678Basic quality (BQ)Rock mass qualityRock mechanical propertiesDrilling process monitoring (DPM)Drilling parameters |
| spellingShingle | Xinfang Li Xiaoping Zhang Quansheng Liu Shaohui Tang Qi Zhang Yongbin Liu Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring Journal of Rock Mechanics and Geotechnical Engineering Basic quality (BQ) Rock mass quality Rock mechanical properties Drilling process monitoring (DPM) Drilling parameters |
| title | Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring |
| title_full | Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring |
| title_fullStr | Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring |
| title_full_unstemmed | Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring |
| title_short | Evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring |
| title_sort | evaluation of rock mass quality and its mechanical properties through digital drilling process monitoring |
| topic | Basic quality (BQ) Rock mass quality Rock mechanical properties Drilling process monitoring (DPM) Drilling parameters |
| url | http://www.sciencedirect.com/science/article/pii/S1674775525000678 |
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