›› 2015, Vol. 36 ›› Issue (S1): 486-490.doi: 10.16285/j.rsm.2015.S1.084

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of settlement of cross tunnels under cyclic metro loading

GAO Guang-yun1, LI Shao-yi1, TU Mei-ji1, ZHANG Xian-lin2   

  1. 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Shanghai Municipal Bureau of Planning and Land Resources, Shanghai 200003, China
  • Received:2015-03-05 Online:2015-07-11 Published:2018-06-14

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Abstract: Three-dimensional finite difference model of cross tunnels is established by FLAC3D to compute deformation and stress of soft soil under metro train cyclic loading which is modeled by artificial numerical exciting force. Modified dynamic deviatoric stress model for long-term settlement of soft soil combined with layer-wise summation method are adopted to calculate tunnel settlement and predict long-term settlement of cross tunnels. Long term settlement in three train-running cases is studied. Case 1, one train traveled through tunnel #1, case 2, one train traveled through tunnel #2, case 3, two trains traveled through tunnel #1 and tunnel #2 separately at the same time. Influences of train speed, stiffness and thickness of tunnel lining on long-term settlement of cross tunnels are studied. The results show that the settlement induced by train loading mainly distributes within 20 m from the central axis of tunnels. Sum of settlement in case 1 and case 2 is less than settlement in case 3; and tunnel settlement decreases with the increasing of train speed, stiffness and thickness of tunnel lining; while the influence of thickness of tunnel lining is more than stiffness of the lining.

Key words: cyclic metro loading, cross tunnels, long-term settlement, three-dimensional finite difference model

CLC Number: 

  • U 452
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