Research on key issues in the design of large urban underground pumping stations under complex conditions

Abstract

The Gongming Reservoir-Qinglinjing Reservoir Connection Project is one of the supporting projects of the Pearl River Delta Water Resources Allocation Project within Shenzhen city, serving as a crucial component of Shenzhen's backbone water network. The Banxuegang-Miaokeng Pump Station adopts an underground pumping station design, comprising two pump units: the Banxuegang unit supplies water to Banxuegang Waterworks(2 operational + 1 standby), while the Miaokeng unit serves Miaokeng Waterworks(2 operational + 1 standby). The station is equipped with six horizontal centrifugal pumps in total(4 operational + 2 standby), and includes a dedicated connecting pipeline for Miaokeng Waterworks to enable gravity-fed water supply from Qinglinjing Reservoir. The main pump chamber features excavation dimensions of 118.3×17.0×29.85 m(L×W×H). Considering Shenzhen's urban spatial constraints and stringent environmental requirements, this paper elaborates on the comprehensive design philosophy of the Banmiao Pump Station, detailing key technical aspects including: overall station layout planning, arrangement design, excavation stability control, underground drainage solutions and safety monitoring system design.

Keywords

urban space / large underground pumping station / overall layout / stability of surrounding rock / supporting design