Lining Construction for the Shaft Section of Tailwater Surge Chamber with a Giant"Cylinder+Inverted Cone"Structure
In the past,the shape of tail surge chamber of underground power plants was mostly designed with a regular cylindrical or rectangular structure.However,under special geological conditions,in order to ensure the safety of the tunnel structure,the design structure shape has to be optimized differently from conventional design.The No.8 tailwater surge chamber on the right bank of Baihetan Hydropower Station is one of the typical representative works.Under adverse geological conditions such as high ground stress,columnar joints,large interlayer fault zones,and steep dip faults,a clever design of a"cylinder+inverted cone"wellbore section structure was adopted.It cleverly transitions the section of surgechamber shaft from A48 m to A39.2 m of the dome,greatly reducing the span of the pressure regulating chamber dome and making the entire dome a streamlined structure.However,this design resulted in the upper side wall of surgechamber being in an inverted state,posing a great challenge to construction.
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