ABSTRACT

The hydrodynamic behaviours and progressive collapse phenomenon of the submerged floating tunnel (SFT) under anchor cable breakage are experimentally investigated in this study. A physical scale segment model of the SFT under wave and current loadings is designed and studied in wave-current flume. A specially designed anchor cable breakage device is presented. The experimental data are observed to conform well to the numerical calculation results. The dynamic performance of the SFT under anchor cable breakage is comprehensively investigated based on varying effect factors. The results from the test indicate that the response variation assessment, transient effect, force redistribution and impact force in different cases are the key factors to determine the probability of instability and progressive collapse of the SFT under cable breakage. The results can provide valuable design and construction recommendations to avoid potential engineering risks and ensure the safety and stability for the SFT under marine environment.

摘要

本研究通过试验研究了锚索断裂下水下浮式隧道（SFT）的水动力行为和渐进倒塌现象。在波流水槽中设计和研究了波浪和水流载荷下的SFT物理尺度分段模型。介绍了一种专门设计的锚索断裂装置。观察到实验数据与数值计算结果吻合良好。基于不同的影响因素，全面研究了锚索断裂下SFT的动力性能。试验结果表明，不同情况下的响应变化评估、瞬态效应、力重新分布和冲击力是决定SFT在电缆断裂下失稳和逐渐倒塌概率的关键因素。