Deformation Characteristics of a Segment Lining Structure for a Shield Tunnel Adjacent to Piles
(1 Nanchang Rail Transit Group Co. Ltd., Nanchang 330038; 2 Hubei Dayu Water Resources and Hydropower Construction Co. Ltd.,Wuhan 430061; 3 School of Civil Engineering, Hefei University of Technology, Hefei 230009; 4 Anhui Road & Bridge Group Co. Ltd.,Hefei 210029)
Abstract：
As for one running section of Hefei Metro Line 1 adjacent to a pile group foundation, the shield driving process is simulated using the finite- element software Midas, with a focus on segment deformation and internal force change. The tunneling process of a shield machine under different grouting pressures and approaching or not approaching a pile group is simulated and a comparative analysis of the effect on the segment′s internal force and deformation is conducted. The results show that: when grouting pressure is within the range of 0.1 MPa to 0.4 MPa, the internal force and deformation of the tunnel segment increase with an increase of the grouting pressure during shield tunnelling; and the internal force and deformation of the tunnel segment are restrained by piles during shield tunnelling adjacent to a pile group foundation, and these are related to the distance between the tunnel segment and the piles, with apparent restraint of the horizontal displacement for the tunnel segment closest to the pile group foundation.
2017, Vol. 54 