What is the geological structure of the underground powerhouse?The geological structure of the main underground powerhouse is simple and there are no regional faults and large-scale faults passing through the study area. According to the statistics of exploring caves in the underground powerhouse area, the main structural planes are rock layers and joint cracks.
What is the lithology of underground powerhouse?The main conclusions are as follows The lithology of the underground powerhouse is mainly composed of sandstone, conglomerate, and Siltstone. The rock masses have geological conditions for cave formation, and the overall stability of the surrounding rock mass is good.
Why do we need a support system for underground powerhouses?The support system can effectively reduce the deformation and plastic zone during the excavation of the underground powerhouse. In addition, the supporting setup has obvious effects on limiting the slippage of the soft rock layers.
What is a Grade 3 Powerhouse?The surrounding rock masses of the powerhouse are classified as grade III by the rock mass rating system (RMR) system. The burial depth of the powerhouse is 950–1050 m in the horizontal direction and 260–330 m in the vertical direction.
How many joints are there in the main underground powerhouse?There are 386 joints with a length of more than 1 m, the development density is 0.42/m, and the spacing is 2.4 m. The joints are mostly closed, with local micro-opening and no filling. Figure 3. Stereographic projection of the main geological structures in the main underground powerhouse.
How can a large-span underground powerhouse support design be assessed?In general, the empirical classification methods and numerical methods are useful tools for preliminary assessments of large-span underground powerhouse support desig
An underground power station is a facility that utilizes a significant natural difference in elevation between two waterways, such as a waterfall or mountain lake, to generate electricity. It is
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Jun 1, 2022 · The stability of the surrounding rocks of large underground powerhouses is always emphasized during the construction process, especially in large-scale underground projects
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Apr 29, 2024 · A 9-year study on the deformation and stability problem of the large deep underground cavern in Baihetan power station was carried out.
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An underground power station is a type of hydroelectric power station constructed by excavating the major components (e.g. machine hall, penstocks, and tailrace) from rock, rather than the
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Jun 16, 2025 · However, due to the insufficient representativeness and unreliability of in-situ stress measurements, it is difficult to determine the complete 3D in-situ stress field around
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Oct 1, 2016 · 1. Introduction Jinping I hydropower station involves cascaded development of the hydropower resources on the Yalong River. The major structures consist of a concrete double
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Apr 28, 2025 · The surrounding rock structure of the underground powerhouse of Jurong Pumped Storage Power Station is complex, with unfavorable geological conditions such as argillaceous
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Jul 11, 2022 · The conventional FEM cannot simulate the deformation of excavation underground with many soft rock layers well. In the paper, the main powerhouse of the Panlong pumped
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Jul 11, 2022 · The conventional FEM cannot simulate the deformation of excavation underground with many soft rock layers well. In the paper, the main powerhouse of the Panlong pumped
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Jun 12, 2023 · Abstract: With the rapid development of pumped storage, the vibration problems caused by the operation of power stations have become increasingly prominent. In this paper,
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Apr 29, 2024 · A 9-year study on the deformation and stability problem of the large deep underground cavern in Baihetan power station was carried out.
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Oct 27, 2025 · China has witnessed extensive construction of underground powerhouses for pumped storage power stations. With the continuous increase in unit capacity, vibration
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The geological structure of the main underground powerhouse is simple and there are no regional faults and large-scale faults passing through the study area. According to the statistics of exploring caves in the underground powerhouse area, the main structural planes are rock layers and joint cracks.
The main conclusions are as follows The lithology of the underground powerhouse is mainly composed of sandstone, conglomerate, and Siltstone. The rock masses have geological conditions for cave formation, and the overall stability of the surrounding rock mass is good.
The support system can effectively reduce the deformation and plastic zone during the excavation of the underground powerhouse. In addition, the supporting setup has obvious effects on limiting the slippage of the soft rock layers.
The surrounding rock masses of the powerhouse are classified as grade III by the rock mass rating system (RMR) system. The burial depth of the powerhouse is 950–1050 m in the horizontal direction and 260–330 m in the vertical direction.
There are 386 joints with a length of more than 1 m, the development density is 0.42/m, and the spacing is 2.4 m. The joints are mostly closed, with local micro-opening and no filling. Figure 3. Stereographic projection of the main geological structures in the main underground powerhouse.
In general, the empirical classification methods and numerical methods are useful tools for preliminary assessments of large-span underground powerhouse support designs.
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