Study On Ground Surface Settlement Control During Tunnel Excavation Of Metro Running Tunnel

As the requirements of Metro line's setting, there is inevitably closed double-tunnel in building Metro engineering. This paper refers the case project of the running tunnel from Grand theater to Science Museum in Shenzhen Metro, through FEM numerical simulation, researches the ground surface settlement and influence on the underground pipeline in soft stratum abundant with water by the technique of horizontal jet grouting. In order to achieve the optimized tunneling approach, first, tunneling procedures, shift length, horizontal jet grouting length, bench length and space length between C and D part of CRD method are optimized; On the basis of these results, two kinds of tunneling schemes are calculated with three-dimensional FEM and the optimized tunneling scheme is achieved. As results of the optimized scheme, the conclusion is made that the gas pipe above the tunnel of Sk3 + 355 section is secure. The calculation results are verified through comparison of numerical simulation results and site-monitoring measurement data. On the puzzle of kinetic simulation of tunneling with centrifuge model, a trial research is made in this paper on the section of SK3+395 of Shenzhen Metro. And the responding numerical simulation is also done. Comparing with the centrifuge model test, the feasibility of the method used in this paper simulating tunneling is verified.