|
Abstract Zhanjiang bay tunnel is the deepest sea-crossing shield tunnel inland，which withstands a hydraulic pressure of 60 m during the construction and operation periods. Combined with the local conditions for tracking test，the external water pressure and earth pressure of the segment，reinforcement stress in segment and contact stress between segments were monitored successfully. The loose zone scope of the shield tunnel construction and the concrete structure stress of the segment were calculated，and they are useful to follow the structure safety status in time，and offer the measured parameters for safety construction. An osmometer installation method was proposed to monitor the shield tunnel segment external water pressure successfully，as well as innovations on the other sensor installation methods. Monitoring results show that，in the seabed soil shield tunnel project，the external structure load were mainly composed of water pressure，even in the clay layer with small permeability coefficient. The monitoring methods and results could be used for coastal shield tunnel in soft soil area with offering a valuable reference for its monitoring，design and construction in the future.
|
|
Received: 23 May 2013
|
|
|
|
2014, Vol. 33 
