期刊
ENGINEERING FAILURE ANALYSIS
卷 79, 期 -, 页码 464-490出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2017.04.030
关键词
Tunnel safety; Partial failure; Model tests; Progressive collapse; Failure criterion
资金
- China Postdoctoral Science Foundation [2014M561186]
- National Natural Science Foundation of China [51508382]
- Key Project of the National Natural Science Foundation of China [41630641]
Catastrophic tunnel collapses usually start with the partial failure of tunnel linings. However, research on the mechanism of such progressive collapses is limited. Among such collapses, a considerable number of accidents have arisen from the construction of a connecting passage, which requires removing segments at the springline. Therefore, in this study, a series of customized model tests were conducted to investigate the mechanism underlying tunnel collapse due to this operation. The test results showed that the inrush of the sand due to the removal of a certain segment at the springline may lead to the loss of soil resistance around the openings, resulting in a sudden increase in the bending moments of the adjacent linings. In particular, an increase in the cover-depth-to-diameter ratio (C/D) can aggravate the development of the maximum bending moment, although it has little influence on, the affected length of the tunnel. To address the load sustained by the segments and joints during collapse that the model tests fail to show, 3D numerical analyses based on the load-structure model were performed. Via comparison with existing failure criteria for both segments and joints, the safety of the adjacent tunnel linings can be evaluated.
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