黄土连拱隧道二次衬砌的结构分析与监测研究

Structural analysis and monitoring for secondary lining of doubled arch tunnel in loess

摘要: 大跨连拱隧道受结构和跨度的影响,其初期支护与二次衬砌各自承受不同的围岩压力。通过数值计算和现场监测分析表明,二次衬砌所受荷载很大,在初期支护和二次衬砌间存在不均匀压力,二次衬砌也是隧道的主要承载结构。二次衬砌所受荷载大小与其施筑时间有很大的关系,在设计和施工中要合理掌握二次衬砌所承担的荷载比例和以及施筑时间。

Abstract: As the large spanned arch tunnel is influenced by the structure and span, the loads on initial support and secondary lining are different. Based on numerical calculation and monitoring, it was shown that there were different pressures on the initial support and secondary lining. The load on secondary lining was large. The secondary lining was an important part of the supporting structure. The magnitude of the load was affected by the construction duration. It is necessary to know the distribution of load and the construction duration when we design and construct such tunnels.