CAJ | 학술논문

甬江沉管隧道位于甬江下游河湾处的软土地基上，地基承载力较低，使隧道发生了较大的沉降。此外，甬江严重的淤积及每天2.67 m的潮差对隧道的沉降产生了显著的影响。依据甬江沉管隧道运营期间16 a的沉降监测数据，结合地层条件、潮汐和清淤资料，对该条沉管隧道的长期沉降进行了分析，并提出了基于流-固耦合理论的有限元方法计算沉管隧道的长期沉降，计算结果与监测结果具有较好的一致性。此外，采用上述计算方法分析了影响沉管隧道沉降的3个主要因素（即地层条件、基槽淤积和回淤与清淤）对隧道运营期沉降的影响。分析表明，地层条件是影响沉管隧道沉降的主要因素，软土地基隧道沉降远大于其他地基。潮汐作用会使隧道沉降发生周期性变化，该变化约占隧道运营期沉降的4%～10%。淤积对隧道长期沉降影响显著，但定期清淤只能短时间减小隧道的沉降，使隧道沉降产生周期性变化。上述结论均可为相关工程提供参考。
용강침관수도위우용강하유하만처적연토지기상，지기승재력교저，사수도발생료교대적침강。차외，용강엄중적어적급매천2.67 m적조차대수도적침강산생료현저적영향。의거용강침관수도운영기간16 a적침강감측수거，결합지층조건、조석화청어자료，대해조침관수도적장기침강진행료분석，병제출료기우류-고우합이론적유한원방법계산침관수도적장기침강，계산결과여감측결과구유교호적일치성。차외，채용상술계산방법분석료영향침관수도침강적3개주요인소（즉지층조건、기조어적화회어여청어）대수도운영기침강적영향。분석표명，지층조건시영향침관수도침강적주요인소，연토지기수도침강원대우기타지기。조석작용회사수도침강발생주기성변화，해변화약점수도운영기침강적4%～10%。어적대수도장기침강영향현저，단정기청어지능단시간감소수도적침강，사수도침강산생주기성변화。상술결론균가위상관공정제공삼고。
Yongjiang immersed tunnel, built in 1987 and opened in 1995, is a 420 m long road immersed tunnel. It is on the soft soil foundation in a bend of Yongjiang River, which has caused large settlement. Moreover, the severe sediment deposition and 2.67m tidal range in Yongjiang River also have a great influence on the settlement of tunnel. Based on the monitoring data of settlement, the paper analyses the subsoil conditions, tide and desilting’s influence on settlement. And a finite element method based on fluid-solid coupling method is put forward to simulate the long term settlement, and the simulation results are in good agreement with the monitoring data. In addition, the key influencing factors of tunnel settlement, including subsoil condition, trench siltation and siltation and desilting above the element, are calculated and compared. The monitoring data and finite element analysis show that the subsoil condition is the main factor that determines the magnitude of settlement, and the settlement of tunnel on soft soil is much larger than that on other kind of foundations;because of the tidal range, tunnel is subject to an oscillation of elevation which may account for 4%~10% of settlement of operation period; the effect of silting on tunnel is obvious, but regular desilting can only decrease the settlement temporarily and cause the settlement cyclic variation. Although the monitoring data were obtained from a specific project, the conclusions of the study are sufficiently general and may apply in other immersed tunneling projects.