NUMERICAL ANALYSIS OF THE INFLUENCE OF DIFFERENT SHIELD TUNNELING CONSTRUCTION PARAMETERS ON SURFACE SETTLEMENT
This paper studies the rule of influence of different construction parameters on surface settlement of shield tunnel during construction stage. Taking a shield tunnel project in Hangzhou as the case,a three-dimensional construction model of shield tunnel is established by Midas GTS NX numerical software. The influence of construc-tion parameters including elastic modulus of grouting body,grouting pressure,and thrust of the face of the hand on surface settlement during construction stage are analyzed. The results show that the surface lateral settlement curve shows an inverted V-shape,and the maximum values are all located directly above the tunnel arch under different construction parameter conditions. Properly increasing grouting pressure and palm face thrust reduce surface settle-ment. The elastic modulus of the grouting body is inversely proportional to the surface settlement. The influence of different construction parameters on surface settlement is ranked in descending order,including grouting pressure,elastic modulus of grouting body,and palm face thrust. The research results may provide the reference and inspira-tion for related engineering.
shield tunnelsurface subsidenceelastic modulus of grouting bodygrouting pressurepalm face thrust