CORRELATION BETWEEN SURFACE DEFORMATION AND CONSTRUCTION PARAMETERS IN SILTY CLAY GROUND TUNNELING WITH SUPER LARGE DIAMETER SLURRY SHIELD TBM

This paper provides the theoretical basis and technical support for related large-diameter slurry shield engineering in silty clay formations. It analyzes the ground deformation monitoring and construction parameter data of Jinan Yellow River Tunnel project. It presents the relationship between the characteristics of surface deformation and the construction parameters. It puts forward the key control construction parameters of the ultra-large diameter slurry shield tunneling passing through important structures. The research results show that under different construction parameters there are significant differences in the characteristics of ground deformation. The amount of grouting has the greatest influence on surface deformation. The cutterhead thrust,mud pressure,grouting pressure and tunneling speed are the smallest. And the influence of the grouting amount on the surface deformation varies with the buried depth of the tunnel. It has significant impact on the surface deformation when the buried depth is less than the tunnel diameter. In addition,when the muddy water pressure is about 0.1MPa bigger than the soil pressure and the grouting pressure is about 0.3MPa bigger than the soil pressure,the ground deformation of the structure area is acceptable,and the geological adaptability of the shield is significantly optimized.