期刊
STRUCTURE AND INFRASTRUCTURE ENGINEERING
卷 12, 期 10, 页码 1364-1379出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15732479.2015.1117115
关键词
Urban rail traffic; shield tunnel lining; full-scale test; failure mechanism; joint bolt; ultimate bearing capacity
资金
- National Natural Science Foundation of China [51578409]
- State Key Laboratory for Hazard Reduction in Civil Engineering, Tongji University
The serviceability of segmental tunnel linings is attracting more and more attention within the operation of urban rail traffic. Full-scale tests are herein conducted to determine the ultimate bearing capacity of continuously jointed segmental tunnel linings, considering changes of surrounding environment. The design of tested linings and loading schemes are described. The most important results are the evolution of deformations, cracking and opening of joints and forces in bolts. The bearing capacity, role of joint bolts and failure mechanism of the tested linings are analysed. It is found that failure of these linings is caused by the failure of joints. Thus, in order to optimise structural design of tunnel linings, more attention needs to be paid to maximise the joint strength. It is also found that circumferential joint bolts could take action and offer the safety margin in connection with the response of segmental structures. What's more, a comparison of different experimental loading conditions has shown that segmental lining structures are more vulnerable to lateral unloading than to overload conditions.
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