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Stability Analysis Regarding Underground Cavern Group of Songyang Pumped Storage Power Station
This paper has analyzed the stability of the underground caverns of the Songyang pumped storage power station with FLAC3D. Firstly, the initial stress of the model is calculated through a two-dimensional hydraulic fracturing stress test, which displayed the maximum principal stress as 17.7~19.4 MPa with the direction of $\mathrm{N}70^{\circ}$ E. Secondly, different spaces between caverns have been analyzed, and a spacing of 40 m has been selected with the nearly same stability effect as 45m. Then, the excavation response of not supported caverns has been simulated, which illustrates that the general deformation of caverns is 17~98.5mm. And the maximum deformation occurs in the upstream side wall. The maximum depth of the plastic zone is nearly 15m and the maximum principal stress is near 36 MPa, which may cause medium rock stress problems. Finally, two different support conditions have been compared and evaluated. The stress of the rock bolts in support scheme 2 is about 52.6% in the range of 50~300MPa, while the stress of the bolt in support scheme 1 is about 48% in this range, indicating that the bearing performance of the bolt in support scheme 2 is better. Overall, this paper suggests a cavern rock pillar of 40m, and support case 2 with longer rock bolts in the Songyang project.
Stability Analysis Regarding Underground Cavern Group of Songyang Pumped Storage Power Station
This paper has analyzed the stability of the underground caverns of the Songyang pumped storage power station with FLAC3D. Firstly, the initial stress of the model is calculated through a two-dimensional hydraulic fracturing stress test, which displayed the maximum principal stress as 17.7~19.4 MPa with the direction of $\mathrm{N}70^{\circ}$ E. Secondly, different spaces between caverns have been analyzed, and a spacing of 40 m has been selected with the nearly same stability effect as 45m. Then, the excavation response of not supported caverns has been simulated, which illustrates that the general deformation of caverns is 17~98.5mm. And the maximum deformation occurs in the upstream side wall. The maximum depth of the plastic zone is nearly 15m and the maximum principal stress is near 36 MPa, which may cause medium rock stress problems. Finally, two different support conditions have been compared and evaluated. The stress of the rock bolts in support scheme 2 is about 52.6% in the range of 50~300MPa, while the stress of the bolt in support scheme 1 is about 48% in this range, indicating that the bearing performance of the bolt in support scheme 2 is better. Overall, this paper suggests a cavern rock pillar of 40m, and support case 2 with longer rock bolts in the Songyang project.
Stability Analysis Regarding Underground Cavern Group of Songyang Pumped Storage Power Station
Cheng, Yongjin (author) / Cao, Aiwu (author) / He, Jiachuan (author) / Chu, Weijiang (author)
2022-11-25
5134313 byte
Conference paper
Electronic Resource
English
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