Numerical simulation of land subsidence caused by subway train vibration using PFC
<p>Subsidence induced by human activity and urbanization is distributed in an area or along a line. In Shanghai, China, land subsidence is distributed along the belt near a subway line. The subsidence is caused by train vibration as well as regional land subsidence and other engineering activi...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-04-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/382/559/2020/piahs-382-559-2020.pdf |
| Summary: | <p>Subsidence induced by human activity and urbanization is
distributed in an area or along a line. In Shanghai, China, land subsidence
is distributed along the belt near a subway line. The subsidence
is caused by train vibration as well as regional land subsidence and other
engineering activity. In order to figure out the mechanical response of the
tunnel surroundings, the PFC2D software based on a discrete element method
is introduced to simulate a section of the metro tunnel. The linear contact
bond model was employed to reflect the characteristics of clay. Based on the
analysis of stress and settlement caused by dynamic cyclic loading, the
mechanical response law and subsidence mechanism were investigated. In
addition, the influence of frequency on settlement was also analyzed: the
greater the frequency, the more particles were rearranged and the larger
the settlement. The fraction of sliding contacts was introduced to
explain this phenomenon. The results can be used to understand, predict
and control land subsidence to protect the geological environment.</p> |
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| ISSN: | 2199-8981 2199-899X |