Construction Technology Research of Soil Reinforcement Method When the Shield Tunneling Group Pile Foundation in Hangzhou Metro

It is dangerous for bridge traffic and subway tunnel construction when the shield machine crossing the bridge group pile foundation sections, because the soil is disturbed and transmission displacement of pile foundation. Hangzhou 1 Line Metro using second times grouting and steel pipe grouting technique, the slurry fully filled pores of soil in the end of shield, the soil becomes more stable, the field tests indicated that the lateral displacement of the tunnel close to pile reduced more than20 %. The average reduce of surface subsidence is 6. 1 mm, effectively ensured the safety of the bridge structure and the construction of the subway.