Abstract:

The researches on the quantitative analysis of ground settlement induced by the shield tunnelling workmanship are relatively less. In this paper, three workmanship parameters, i.e. grouting filling ratio, shield pitch ratio and support pressure ratio, are introduced into the gap parameters to make the quantitative analysis of ground settlement based on Loganathan expressions. The deep discussion about the equivalent circle zone which was proposed by some scholars is made to provide the basis of numerical analysis for the shield tunneling project. The back analysis of the Xi’an metro line-2 is carried out to validate the rationality of the method introduced in this paper. It is shown that the method can factually reflect the workmanship level and offer a certain reference to the control of the ground settlement during the shield tunneling.

Key words: ground settlement, workmanship of shield tunneling, gap parameters, equivalent circle zone, finite element method