کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5013571 1462947 2017 57 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of the collapse mechanism of shield tunnels due to the failure of segments in sandy ground
ترجمه فارسی عنوان
بررسی مکانیزم فروپاشی تونل های سپر به دلیل شکست بخش ها در زمین های شنی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Failure Analysis - Volume 79, September 2017, Pages 464-490
نویسندگان
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