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 excavation procedure is as follows. Firstly, excavate the ventilation and safety tunnel on the roof of the powerhouse, the traffic tunnel for entering, and the air inlet tunnel of the main powerhouse. After proper support, the main powerhouse and main transformer tunnel are excavated.
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