• ISSN 0258-2724
  • CN 51-1277/U
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Volume 57 Issue 5
Oct.  2022
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Article Contents
MA Longxiang, JIN Yongfu, ZHANG Chao, WANG Le. Long-Term Settlements of Composite Stratum of Clay and Silt and Metro Tunnel in It Due to Train Operation[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1103-1112. doi: 10.3969/j.issn.0258-2724.20200685
Citation: MA Longxiang, JIN Yongfu, ZHANG Chao, WANG Le. Long-Term Settlements of Composite Stratum of Clay and Silt and Metro Tunnel in It Due to Train Operation[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1103-1112. doi: 10.3969/j.issn.0258-2724.20200685

Long-Term Settlements of Composite Stratum of Clay and Silt and Metro Tunnel in It Due to Train Operation

doi: 10.3969/j.issn.0258-2724.20200685
  • Received Date: 21 Oct 2020
  • Rev Recd Date: 23 Mar 2021
  • Available Online: 21 Sep 2022
  • Publish Date: 26 Mar 2021
  • In order to find out the long-term effects of train load on the composite stratum of clay and silt and the metro tunnel in it, the dynamic response characteristics of this kind of composite stratum under a metro tunnel in a typical section of Wuxi Metro lines due to the moving train were firstly studied through a 2.5-dimensional (2.5D) track-tunnel-ground coupling model. Based on this, combined with the undrained deformation accumulated characteristics and the pore water pressure accumulated characteristics of corresponding soils under the cyclic loading, the developments of the long-term settlements of the concerned composite stratum and the tunnel structure due to the train vibration loads were finally obtained and analyzed through the layered summation method. The analysis results show that: 1) the dynamic deviatoric stress of the foundation soil under the tunnel increases first and then decreases with the increase of the depth, and its maximum value can reach 2.8 kPa, which appears at the position with a distance of 1.3 m to the tunnel invert; 2) the train-induced settlement of tunnel structure in the composite stratum mainly occurs within the first 200000 operation periods of metro trains, and it develops rapidly during these periods; 3) the stable train-induced settlement of tunnel structure in the composite stratum has a magnitude of 13.44 mm, in which the part caused by the accumulated undrained plastic strain of soil is 11.40 mm, accounting for 85% of the total value, while the part caused by the dissipation of accumulated pore water pressure and the corresponding consolidation of soil is 2.04 mm, accounting for 15% of the total value; 4) the long-term deformation of the composite stratum of clay and silt mainly occurs within 15 m below the tunnel, and the contribution of soil settlement within this range to the magnitude of the long-term settlement of the tunnel structure can account for 90%.

     

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