Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures
A high-precision microseismic (MS) monitoring system was built to monitor surrounding rock microfractures in the underground powerhouse on the left bank of Shuangjiangkou Hydropower Station. The surrounding rock damage area with spatiotemporal clustering of MS activities was studied for qualitative...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-08-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775522000488 |
| _version_ | 1818507325950918656 |
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| author | Peiwei Xiao Haoyu Mao Bo Qian Biao Li Xingguo Yang Nuwen Xu |
| author_facet | Peiwei Xiao Haoyu Mao Bo Qian Biao Li Xingguo Yang Nuwen Xu |
| author_sort | Peiwei Xiao |
| collection | DOAJ |
| description | A high-precision microseismic (MS) monitoring system was built to monitor surrounding rock microfractures in the underground powerhouse on the left bank of Shuangjiangkou Hydropower Station. The surrounding rock damage area with spatiotemporal clustering of MS activities was studied for qualitative analysis of the damage mechanism of surrounding rock microfractures, based on the source parameters of MS events. The surrounding rock microfracture scale characterized by the source radius of MS events was considered to establish the constitutive relation. MS information was imported into the model for numerical analysis using fast Lagrangian analysis of continuain 3 dimensions (FLAC3D). The results indicated that the numerical simulation results considering MS damage can better reflect the actual situation of the field. The surrounding rock microfractures mainly showed mixed failure characteristics. Shear failures appeared in localized areas while the fracture scale of sections from K0–33 m to K0–15 m on the vault was large. The deformation increment caused by microfracture damage in the shallow surrounding rock of the top arch accounted for 10%–13%, and the stress decrement in the surrounding rock caused by microfracture damage accounted for about 10%. |
| first_indexed | 2024-12-10T22:16:57Z |
| format | Article |
| id | doaj.art-c61e6da1e9094544a40f73a26865d653 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-12-10T22:16:57Z |
| publishDate | 2022-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-c61e6da1e9094544a40f73a26865d6532022-12-22T01:31:26ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552022-08-0114411151130Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfracturesPeiwei Xiao0Haoyu Mao1Bo Qian2Biao Li3Xingguo Yang4Nuwen Xu5State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China; Guodian Jinshajiang Xulong Hydropower Development Co., Ltd, Chengdu, 610041, ChinaState 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, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, China; Corresponding author.State 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.A high-precision microseismic (MS) monitoring system was built to monitor surrounding rock microfractures in the underground powerhouse on the left bank of Shuangjiangkou Hydropower Station. The surrounding rock damage area with spatiotemporal clustering of MS activities was studied for qualitative analysis of the damage mechanism of surrounding rock microfractures, based on the source parameters of MS events. The surrounding rock microfracture scale characterized by the source radius of MS events was considered to establish the constitutive relation. MS information was imported into the model for numerical analysis using fast Lagrangian analysis of continuain 3 dimensions (FLAC3D). The results indicated that the numerical simulation results considering MS damage can better reflect the actual situation of the field. The surrounding rock microfractures mainly showed mixed failure characteristics. Shear failures appeared in localized areas while the fracture scale of sections from K0–33 m to K0–15 m on the vault was large. The deformation increment caused by microfracture damage in the shallow surrounding rock of the top arch accounted for 10%–13%, and the stress decrement in the surrounding rock caused by microfracture damage accounted for about 10%.http://www.sciencedirect.com/science/article/pii/S1674775522000488Underground powerhouseMicroseismic (MS) monitoringNumerical modelingMicrofracture damageConstitutive relation |
| spellingShingle | Peiwei Xiao Haoyu Mao Bo Qian Biao Li Xingguo Yang Nuwen Xu Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures Journal of Rock Mechanics and Geotechnical Engineering Underground powerhouse Microseismic (MS) monitoring Numerical modeling Microfracture damage Constitutive relation |
| title | Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures |
| title_full | Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures |
| title_fullStr | Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures |
| title_full_unstemmed | Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures |
| title_short | Stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures |
| title_sort | stability analysis of surrounding rock mass in underground powerhouse considering damage effect of microfractures |
| topic | Underground powerhouse Microseismic (MS) monitoring Numerical modeling Microfracture damage Constitutive relation |
| url | http://www.sciencedirect.com/science/article/pii/S1674775522000488 |
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