Analysis Of Ground Settlement Rule In Silty Clay Strata Owing To Subway Shield Tunnel

First phase of Kunming Metro tunnel which throughs the strata are mainly silty clay layer. In Water-rich silty clay stratum using shield method to excavation tunnel,how to effectively control ground settlement, related research reports are still rare。In this paper, Shield tunneling is simulated by a finite difference code FLAC3D according to survey information. Then, the characteristic of ground settlement is studied on the basis of combination of the measured data of kun'ming No.1Subway Line and the result of numerical analysis. Detailed analysis of the tunnel depth, tail shield grouting, excavation pressure on the strata vertical,horizontal and level of impact to the settlement, Summary the variation of these factors on the ground settlement, At the same time proposing some measures to control ground settlement, After that Comparison the simulation results and the Monitoring data. Then, To analyze some of the peck formula parameters, the initial texture obtained in the peat layer shield tunnel construction estimate ground settlement caused by the empirical formula. The subway shield construction ground settlement mechanism and law obtained from the reserch can offer the reference value for the similar project plan determination and construction organization plan.