The Site-Monitoring Measurement And Analysing Of The Sectional Tunnel Of The Subway In Soft Stratum Abundant In Water

Utilizing NATM in the construction of the subway interzone tunnel in soft stratum, which is abundant in water, will inevitably influence the embracing rock, cause the tunnel structure reformatting, and be adverse to the surroundings. Therefore, studying the displacements and the regular rules of the stress alternating under different geologies and hydrology and executing operating modes are of great significance to the tunnel executing security and environment protecting.Based on the theory of ground consolidation and the preexisting studies, this thesis studies and analyses the site-monitoring data of SK3+275, SK3+280, SK3+280, SK3+355, SK4+040 sections of Shenzhen Subway Theater to Science Museum running tunnel, which provide with various typical internal deformations, land surface settlement, building settlement and embracing rock stressing. The study brings out the alternating rules of the displacement and stressing along with time and space' s changes when applying NATM in the construction of the subway interzone tunnel in soft stratum abundant in water. It also concludes that the main reason of the whole structure settlement and the land surface settlement should due to the excavation, which leads to the loss of underground water. Adopting horizontal jet grouting instead of small conduit pipes grouting as the previous reinforcing method has an obvious effect and successfully passes the tough sections, since the water sealing function has been improved. Finally, the paper briefly introduces the SIR-2000 radar and the TCRA1101 measurement system, and makes a beneficial effort for the automatization and computerization of the monitoring measurement of the subway tunnel.