Abstract:

The safety of the building on the ground and the construction of shield tunneling should be guaranteed. As a result, numerical simulation and measured data analysis of pile group cutting by shield used in DajuyuanLudancun Section on Line No. 9 of Shenzhen Metro are carried out, so as to study the influence of pile group cutting by shield on ground surface settlement and pile foundation, analyze the shield working parameters and settlement data and summarize the variation rules of shield working parameters and settlement rules of buildings during pile group cutting period. Some conclusions are drawn as follows: 1) The settlement induced during pilecutting period accounts for a large proportion of the total settlement. 2) The ground responses under different conditions, i.e. amount diameters and locations of pile foundations, show different characteristics. 3) The situation of pile foundations and geological conditions should be comprehensively considered so as to choose rational construction parameters.

Key words: Shenzhen Metro, shield tunnel, underground obstacle, numerical simulation, construction parameters, pile cutting