›› 2010, Vol. 31 ›› Issue (12): 3971-3976.

• Numerical Analysis • Previous Articles     Next Articles

3D refined nonlinear finite element analysis of intersecting metro tunnels under near-field ground motion

CHEN Lei, CHEN Guo-xing, LONG Hui   

  1. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China
  • Received:2010-09-06 Online:2010-12-10 Published:2010-12-21

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Abstract:

According to the explicit finite element method of ABAQUS and 32 CPU parallel computing cluster platform of the research group, a three-dimensional refined finite element model for cross tunnels is established and used to research the 3D nonlinear seismic response of cross tunnels under near-field strong ground motion and compare the results with that of one-layer upper/lower tunnels. The results show that: compared with a single deep/shallow-buried tunnels, for any one-layer upper/under tunnel of intersecting metro tunnels, the relative horizontal displacement difference of the tunnel top and bottom is magnified; and the seismic stress of intersecting tunnels is reduced; the seismic stress on the left side of tunnels is larger than that of the right side; and the seismic stress of tunnel spandrel and hance is significantly greater than that of other parts; and the tunnel spandrel is the most dangerous part of the tunnel structure. The acceleration response of top and bottom at the under tunnel of intersecting metro tunnels is larger than that of the upper tunnel; the interaction influence of intersecting metro tunnel on the seismic response of any one-layer upper/under tunnel is related to the cross form of intersecting metro tunnels and the characteristics of the inputted near-field ground motion.

Key words: intersecting metro tunnel, near-field ground motion, 3D refined nonlinear finite element model, nonlinear seismic response characteristics

CLC Number: 

  • TU 435
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