Abstract:

The influence of shield tunneling parameters, including excavation face stabilizing parameters and grouting management parameters, on settlement pattern has been studied by analyzing the measured data and comparing the analysis results with shield tunneling parameters, with the tunneling of Line 8 of Beijing Metro as an example. The relationship between shield tunneling parameters and settlement pattern are summarized. The achievement of this paper can be summarized as follows: 1) In the process of shield tunneling, the ground settlement risk can be reduced by excavation face stabilizing management and grouting management; 2) There will be a high ground loss ratio in the section where the soil volume excavated is higher than that planned; 3) As for the project where there exists a long shield tunneling section beneath old buildings, the total grouting ratio should be controlled in the range of 200%~350%, which is good for the ground settlement control. 

Key words: Beijing Metro, shieldbored tunnel, tunneling parameter, site monitoring, settlement pattern