Microstructure analysis and mechanical parameter estimation of sanding dolomite
Sanding dolomite strata are widely distributed in southwest China. The safety of the water diversion tunnel in Yuxi section of the Central Yunnan water diversion Project has been seriously threatened by the geological disasters such as the reduction of rock strength caused by dolomite sanding and tu...
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Frontiers Media S.A.
2025-03-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2025.1522361/full |
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| author | Fengnian Wang Fengnian Wang Fengnian Wang Fengnian Wang Zewei Li Zewei Li Yongxiang Shi Yongxiang Shi Xiaowen Gong Yanjie Zhang |
| author_facet | Fengnian Wang Fengnian Wang Fengnian Wang Fengnian Wang Zewei Li Zewei Li Yongxiang Shi Yongxiang Shi Xiaowen Gong Yanjie Zhang |
| author_sort | Fengnian Wang |
| collection | DOAJ |
| description | Sanding dolomite strata are widely distributed in southwest China. The safety of the water diversion tunnel in Yuxi section of the Central Yunnan water diversion Project has been seriously threatened by the geological disasters such as the reduction of rock strength caused by dolomite sanding and tunnel sand inrush. In order to explore the mechanical characteristics and obtain the mechanical parameters of sanding dolomite quickly and accurately, this study relies on the Central Yunnan Water diversion Project to first established the classification standard of dolomite sanding grade. The pore structure, microscopic composition and morphological distribution of dolomite with different sanding degrees were studied by means of SEM scanning, EDS spectroscopy and CT scanning. At the same time, based on the field needle penetration test and the Hoek-Brown strength criterion considering the wave velocity and integrity coefficient of rock mass, a method for estimating the mechanical parameters of sanded dolomite was proposed, which was verified by NPI test and field adit test. The results showed that the sanding dolomite could be divided into four grades: slight sanding dolomite, moderate sanding dolomite, strong sanding dolomite and severe sanding dolomite. The higher the sanding grade, the higher the development degree of dolomite pores and the lower the mechanical strength. The action of groundwater will aggravate the dolomite dissolution sanding and lead to the aggravation of surrounding rock breakage. Based on the improved Hoek-Brown strength criterion, the cohesion of strong sanding dolomite is 0.34∼0.71 MPa, the internal friction Angle is 38.59∼50.96°, the uniaxial compressive strength is 3∼15.41 MPa, and the cohesion of severe sanding dolomite is 0.086∼0.17 MPa, the internal friction Angle is 16.17∼19.08°, the uniaxial compressive strength is 0.88–1.67 MPa. And the results were basically consistent with those of needle penetration test and dynamic rock mass tunnel test. |
| format | Article |
| id | doaj-art-ec4e24b8b112450594a5cc4e61fadcf7 |
| institution | DOAJ |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj-art-ec4e24b8b112450594a5cc4e61fadcf72025-08-20T02:41:23ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-03-011310.3389/feart.2025.15223611522361Microstructure analysis and mechanical parameter estimation of sanding dolomiteFengnian Wang0Fengnian Wang1Fengnian Wang2Fengnian Wang3Zewei Li4Zewei Li5Yongxiang Shi6Yongxiang Shi7Xiaowen Gong8Yanjie Zhang9Shanxi Traffic Technology Research and Development Co., LTD., Taiyuan, ChinaState Key Laboratory for Tunnel Engineering, China University of Mining and Technology-Beijing, Beijing, ChinaSchool of Earth Sciences and Engineering, Hohai University, Nanjing, ChinaShanxi Intelligent Transportation Laboratory Co., LTD., Taiyuan, ChinaShanxi Traffic Technology Research and Development Co., LTD., Taiyuan, ChinaShanxi Intelligent Transportation Laboratory Co., LTD., Taiyuan, ChinaShanxi Traffic Technology Research and Development Co., LTD., Taiyuan, ChinaShanxi Intelligent Transportation Laboratory Co., LTD., Taiyuan, ChinaYunnan Dianzhong Water Diversion Engineering Co., LTD., Kunming, ChinaYunnan Dianzhong Water Diversion Engineering Co., LTD., Kunming, ChinaSanding dolomite strata are widely distributed in southwest China. The safety of the water diversion tunnel in Yuxi section of the Central Yunnan water diversion Project has been seriously threatened by the geological disasters such as the reduction of rock strength caused by dolomite sanding and tunnel sand inrush. In order to explore the mechanical characteristics and obtain the mechanical parameters of sanding dolomite quickly and accurately, this study relies on the Central Yunnan Water diversion Project to first established the classification standard of dolomite sanding grade. The pore structure, microscopic composition and morphological distribution of dolomite with different sanding degrees were studied by means of SEM scanning, EDS spectroscopy and CT scanning. At the same time, based on the field needle penetration test and the Hoek-Brown strength criterion considering the wave velocity and integrity coefficient of rock mass, a method for estimating the mechanical parameters of sanded dolomite was proposed, which was verified by NPI test and field adit test. The results showed that the sanding dolomite could be divided into four grades: slight sanding dolomite, moderate sanding dolomite, strong sanding dolomite and severe sanding dolomite. The higher the sanding grade, the higher the development degree of dolomite pores and the lower the mechanical strength. The action of groundwater will aggravate the dolomite dissolution sanding and lead to the aggravation of surrounding rock breakage. Based on the improved Hoek-Brown strength criterion, the cohesion of strong sanding dolomite is 0.34∼0.71 MPa, the internal friction Angle is 38.59∼50.96°, the uniaxial compressive strength is 3∼15.41 MPa, and the cohesion of severe sanding dolomite is 0.086∼0.17 MPa, the internal friction Angle is 16.17∼19.08°, the uniaxial compressive strength is 0.88–1.67 MPa. And the results were basically consistent with those of needle penetration test and dynamic rock mass tunnel test.https://www.frontiersin.org/articles/10.3389/feart.2025.1522361/fullSandingdolomitemicrostructuremechanical parametersestimatetest |
| spellingShingle | Fengnian Wang Fengnian Wang Fengnian Wang Fengnian Wang Zewei Li Zewei Li Yongxiang Shi Yongxiang Shi Xiaowen Gong Yanjie Zhang Microstructure analysis and mechanical parameter estimation of sanding dolomite Frontiers in Earth Science Sanding dolomite microstructure mechanical parameters estimate test |
| title | Microstructure analysis and mechanical parameter estimation of sanding dolomite |
| title_full | Microstructure analysis and mechanical parameter estimation of sanding dolomite |
| title_fullStr | Microstructure analysis and mechanical parameter estimation of sanding dolomite |
| title_full_unstemmed | Microstructure analysis and mechanical parameter estimation of sanding dolomite |
| title_short | Microstructure analysis and mechanical parameter estimation of sanding dolomite |
| title_sort | microstructure analysis and mechanical parameter estimation of sanding dolomite |
| topic | Sanding dolomite microstructure mechanical parameters estimate test |
| url | https://www.frontiersin.org/articles/10.3389/feart.2025.1522361/full |
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