The total length of the underground excavation section of Gongbei tunnel of Hong Kong Zhuhai Macao Bridge is 255m, which passes through Gongbei port, the first mainland crossing bank in China
. 
The underground excavation method of curved pipe curtain + freezing is innovatively adopted
. 
The tunnel is the longest curved pipe curtain tunnel in China, and its scale is rare in the world
. 
(1) the engineering hydrogeological conditions are complex: when crossing multi-layer soft soil stratum and sand stratum, the groundwater pressure is high (30M), the stratum is easy to deform, and the pipe jacking construction is difficult; the requirements for the sealing of pipe jacking starting and receiving device and pipe joint are high
. 
(2) the surrounding environment is complex: there are many pipelines and underground buildings around Gongbei Port (with high safety level), which require strict control of stratum deformation and high precision of pipe jacking
. 
(3) the technical difficulty and risk of the construction method itself are high: the number of pipe jacking is large (36), the pipe spacing is small (350 ~ 360mm), the track is complex (transition curve + circular curve), and the pipe jacking accuracy is required to be high
. 
Disclaimer: the materials, documents and articles published by the geotechnical bureau are all from the Internet
. 
The copyright belongs to the author
. 
They are strictly prohibited to be used for commercial purposes! If there is any infringement, please let us know and delete it immediately
. 
Welcome to the official account.
. 
