Abstract:

Settlement control is fundamental for the successful shield boring crossing underneath existing Metro stations. A series of technologies, including obstacle exploration in advance, consolidation of ground between the shieldbored tunnel and the existing Metro station, determination of proper shield boring parameters and grouting parameters, and optimization of the grouting system of the shield machine, are adopted, which ensures the successful boring of the shield machine. In the end, the total settlement induced by the shield tunneling is less than -1.7 mm, which meets the requirement of the assessment report. The paper can provide reference for the settlement control in similar projects in the future.

Key words: Beijing Metro, shield boring underneath existing station, settlement control