Analysis of Floating Control Measures and Measured Data of Ultra-large Diameter Shield Tunnel in Shallow Buried Extremely Soft Stratum During Construction
Segment floating control is a key problem in the construction control of ultra-large diameter shield tunnel in extremely soft strata.In order to study the characteristics and influencing factors of segment buoyancy during the construction period of ultra-large diameter shield tunnel in extremely soft strata,four anti-buoyancy measures were formulated based on Zhuhai tunnel project,and the effects of different anti-buoyancy measures were compared and analyzed.Based on the measured data,the variation characteristics of segment floating process were studied,and the variation law of segment floating during construction period was revealed.The correlation between the number of displacements,the total thrust,the buried depth of the tunnel and the floating amount of the segment was further analyzed by using scatter diagram.
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