Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation
Surrounding rock deterioration and large deformation have always been a significant difficulty in designing and constructing tunnels in soft rock. The key lies in real-time perception and quantitative assessment of the damaged area around the tunnel. An in situ microseismic (MS) monitoring system is...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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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/S1674775524003494 |
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| author | Yuepeng Sun Nuwen Xu Peiwei Xiao Zhiqiang Sun Huailiang Li Jun Liu Biao Li |
| author_facet | Yuepeng Sun Nuwen Xu Peiwei Xiao Zhiqiang Sun Huailiang Li Jun Liu Biao Li |
| author_sort | Yuepeng Sun |
| collection | DOAJ |
| description | Surrounding rock deterioration and large deformation have always been a significant difficulty in designing and constructing tunnels in soft rock. The key lies in real-time perception and quantitative assessment of the damaged area around the tunnel. An in situ microseismic (MS) monitoring system is established in the plateau soft tock tunnel. This technique facilitates spatiotemporal monitoring of the rock mass's fracturing expansion and squeezing deformation, which agree well with field convergence deformation results. The formation mechanisms of progressive failure evolution of soft rock tunnels were discussed and analyzed with MS data and numerical results. The results demonstrate that: (1) Localized stress concentration and layered rock result in significant asymmetry in micro-fractures propagation in the tunnel radial section. As excavation continues, the fracture extension area extends into the deep surrounding rockmass on the east side affected by the weak bedding; (2) Tunnel excavation and long-term deformation can induce tensile shear action on the rock mass, vertical tension fractures (account for 45%) exist in deep rockmass, which play a crucial role in controlling the macroscopic failure of surrounding rock; and (3) Based on the radiated MS energy, a three-dimensional model was created to visualize the damage zone of the tunnel surrounding rock. The model depicted varying degrees of damage, and three high damage zones were identified. Generally, the depth of high damage zone ranged from 4 m to 12 m. This study may be a valuable reference for the warning and controlling of large deformations in similar projects. |
| format | Article |
| id | doaj-art-f1e33876d50f449ba204847bd77b7e51 |
| institution | Kabale University |
| issn | 1674-7755 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj-art-f1e33876d50f449ba204847bd77b7e512025-01-17T04:49:12ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552025-01-01171309322Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulationYuepeng Sun0Nuwen Xu1Peiwei Xiao2Zhiqiang Sun3Huailiang Li4Jun Liu5Biao Li6State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China; Corresponding author.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaPower China Sinohydro Bureau 7 Co., Ltd., Chengdu, 610213, ChinaKey Laboratory of Earth Exploration and Information Technology, Chengdu University of Technology, Chengdu, 610059, ChinaPower China Sinohydro Bureau 7 Co., Ltd., Chengdu, 610213, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, ChinaSurrounding rock deterioration and large deformation have always been a significant difficulty in designing and constructing tunnels in soft rock. The key lies in real-time perception and quantitative assessment of the damaged area around the tunnel. An in situ microseismic (MS) monitoring system is established in the plateau soft tock tunnel. This technique facilitates spatiotemporal monitoring of the rock mass's fracturing expansion and squeezing deformation, which agree well with field convergence deformation results. The formation mechanisms of progressive failure evolution of soft rock tunnels were discussed and analyzed with MS data and numerical results. The results demonstrate that: (1) Localized stress concentration and layered rock result in significant asymmetry in micro-fractures propagation in the tunnel radial section. As excavation continues, the fracture extension area extends into the deep surrounding rockmass on the east side affected by the weak bedding; (2) Tunnel excavation and long-term deformation can induce tensile shear action on the rock mass, vertical tension fractures (account for 45%) exist in deep rockmass, which play a crucial role in controlling the macroscopic failure of surrounding rock; and (3) Based on the radiated MS energy, a three-dimensional model was created to visualize the damage zone of the tunnel surrounding rock. The model depicted varying degrees of damage, and three high damage zones were identified. Generally, the depth of high damage zone ranged from 4 m to 12 m. This study may be a valuable reference for the warning and controlling of large deformations in similar projects.http://www.sciencedirect.com/science/article/pii/S1674775524003494Soft rock tunnelMS monitoringProgressive failure characteristicExcavation damage zoneFailure mechanism |
| spellingShingle | Yuepeng Sun Nuwen Xu Peiwei Xiao Zhiqiang Sun Huailiang Li Jun Liu Biao Li Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation Journal of Rock Mechanics and Geotechnical Engineering Soft rock tunnel MS monitoring Progressive failure characteristic Excavation damage zone Failure mechanism |
| title | Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation |
| title_full | Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation |
| title_fullStr | Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation |
| title_full_unstemmed | Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation |
| title_short | Characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation |
| title_sort | characterizing large deformation of soft rock tunnel using microseismic monitoring and numerical simulation |
| topic | Soft rock tunnel MS monitoring Progressive failure characteristic Excavation damage zone Failure mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S1674775524003494 |
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