Research and application of macro-micro fracture correlation of heterogeneous granite
Granite structure has the characteristics of discrete distribution and random distribution of minerals, which is particularly critical to the stability of surrounding rock of underground caverns, and the research process is extremely complicated. In this paper, the granite of Dagangshan tunnel in ro...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-02-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1369814/full |
| _version_ | 1797300563493257216 |
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| author | Yunjuan Chen Yunjuan Chen Jiarui Su Tao Gao Yi Jing Huifu Zhang Hongjie Duan Wenbin Zhao |
| author_facet | Yunjuan Chen Yunjuan Chen Jiarui Su Tao Gao Yi Jing Huifu Zhang Hongjie Duan Wenbin Zhao |
| author_sort | Yunjuan Chen |
| collection | DOAJ |
| description | Granite structure has the characteristics of discrete distribution and random distribution of minerals, which is particularly critical to the stability of surrounding rock of underground caverns, and the research process is extremely complicated. In this paper, the granite of Dagangshan tunnel in rock sections of class Ⅲ was taken as the research object, and the mineral composition and proportion, the macro and micro characteristics of granite was analyzed by XRD analysis, SEM and laboratory compressive test; Dagangshan tunnel’s section model with surrounding rock of class Ⅲ was established using the particle flow program PFC and the numerical simulation was done, thus the influence of micro composition and proportion on surrounding rock masses’ stability with the tunnel excavation was analyzed. Results show that: The content of illite and albite is the most, and illite is the weak mineral of the granite. For the granite of Dagangshan tunnel with rock masses of class Ⅲ, the rock failure is mainly caused by shear force and secondary by tensile force. Fracture is mainly concentrated in the enrichment area of “weakened minerals,” where as the breakthrough point and expands to other parts, and further connects. The “enhanced minerals” are basically stable because of their high hardness and strong link between each other. After tunnel excavation, cracks of tunnel’s side walls and the arch foots are more serious, so the supporting measures of these parts should be strengthened. |
| first_indexed | 2024-03-07T23:08:59Z |
| format | Article |
| id | doaj.art-479bad54c49849c0862a76eece14f340 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-07T23:08:59Z |
| publishDate | 2024-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-479bad54c49849c0862a76eece14f3402024-02-21T15:53:09ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632024-02-011210.3389/feart.2024.13698141369814Research and application of macro-micro fracture correlation of heterogeneous graniteYunjuan Chen0Yunjuan Chen1Jiarui Su2Tao Gao3Yi Jing4Huifu Zhang5Hongjie Duan6Wenbin Zhao7Key Laboratory of Building Structural Retrofitting and Underground Space Engineering, Ministry of Education, Shandong Jianzhu University, Jinan, ChinaCivil Engineering College, Shandong Jianzhu University, Jinan, ChinaCivil Engineering College, Shandong Jianzhu University, Jinan, ChinaShandong Earthquake Agency, Jinan, ChinaSchool of Qilu Transportation, Shandong University, Jinan, Shandong, ChinaCivil Engineering College, Shandong Jianzhu University, Jinan, ChinaCivil Engineering College, Shandong Jianzhu University, Jinan, ChinaCivil Engineering College, Shandong Jianzhu University, Jinan, ChinaGranite structure has the characteristics of discrete distribution and random distribution of minerals, which is particularly critical to the stability of surrounding rock of underground caverns, and the research process is extremely complicated. In this paper, the granite of Dagangshan tunnel in rock sections of class Ⅲ was taken as the research object, and the mineral composition and proportion, the macro and micro characteristics of granite was analyzed by XRD analysis, SEM and laboratory compressive test; Dagangshan tunnel’s section model with surrounding rock of class Ⅲ was established using the particle flow program PFC and the numerical simulation was done, thus the influence of micro composition and proportion on surrounding rock masses’ stability with the tunnel excavation was analyzed. Results show that: The content of illite and albite is the most, and illite is the weak mineral of the granite. For the granite of Dagangshan tunnel with rock masses of class Ⅲ, the rock failure is mainly caused by shear force and secondary by tensile force. Fracture is mainly concentrated in the enrichment area of “weakened minerals,” where as the breakthrough point and expands to other parts, and further connects. The “enhanced minerals” are basically stable because of their high hardness and strong link between each other. After tunnel excavation, cracks of tunnel’s side walls and the arch foots are more serious, so the supporting measures of these parts should be strengthened.https://www.frontiersin.org/articles/10.3389/feart.2024.1369814/fullheterogeneousgranitetestnumerical simulationmacro-micro scopic correlation |
| spellingShingle | Yunjuan Chen Yunjuan Chen Jiarui Su Tao Gao Yi Jing Huifu Zhang Hongjie Duan Wenbin Zhao Research and application of macro-micro fracture correlation of heterogeneous granite Frontiers in Earth Science heterogeneous granite test numerical simulation macro-micro scopic correlation |
| title | Research and application of macro-micro fracture correlation of heterogeneous granite |
| title_full | Research and application of macro-micro fracture correlation of heterogeneous granite |
| title_fullStr | Research and application of macro-micro fracture correlation of heterogeneous granite |
| title_full_unstemmed | Research and application of macro-micro fracture correlation of heterogeneous granite |
| title_short | Research and application of macro-micro fracture correlation of heterogeneous granite |
| title_sort | research and application of macro micro fracture correlation of heterogeneous granite |
| topic | heterogeneous granite test numerical simulation macro-micro scopic correlation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1369814/full |
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