Abstract: Tunnel construction in a pumpedstorage power station is characterized by low mechanization, poor operating environment, high safety risk, low construction efficiency, and other factors. Hence, a compact tunnel boring machine (TBM) for the construction of tunnel with an ultrasmall turning radius is developed. The need for a tail shield, an auxiliary thrust cylinder, and a segment erector is eliminated by the usage of a doubleshield TBM, and an integrated TBM is designed in combination with the open TBM anchor net spraying support system. Furthermore, the Vshaped propulsion system design, cutterhead thickplate forging technology, small cutterspacing design, combined wearresistant protection design, compact machine design, beltconveyor adaptability design for an ultrasmall turning radius, integrated belt conveyor design, remote operating system design, etc., are incorporated. The obtained research results have been successfully applied to the construction of the drainage corridor of the Wendeng pumpedstorage power station. 

Key words: pumpedstorage power station, compact TBM; ultrasmall turning radius, propulsion system, remote operation