ANALYSIS OF THE IMPACT OF THRUST AT THE TUNNEL FACE OF DOUBLE-LINE SHIELD TUNNELING ON EXISTING BUILDINGS
To explore the impact of thrust at the tunnel face of a double-line shield on existing buildings,this paper is based on a section of the Hefei Metro.A three-dimensional numerical model of a double-line shield tunnel pass-ing beneath buildings was established using Midas finite element software,focusing on analyzing the effects of face pressure on the surrounding soil and the buildings.The research results indicate that increasing the thrust at the tun-nel face can weaken the impact of buildings on surface settlement,and both building settlement and uneven surface settlement decrease as the thrust increases.During the shield tunneling process,the internal force changes within the buildings exhibit two peak values;the thrust at the tunnel face can reduce the peak values of the internal forces and shorten the duration of their presence.The findings of this study can provide valuable engineering guidance for double-line shield construction.
double-track shieldface thrustsurface settlementinternal force of building
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