海底隧道联络通道冻结法施工健康监测技术研究

Study of Health Monitoring Technology for Cross-passage in Subsea Tunnel Constructed by Freezing Method

使用冻结法修筑联络通道时,施工结束后联络通道结构稳定需要的时间长,对结构进行健康监测是保障联络通道安全的重要手段。为研究海底隧道联络通道健康监测技术,以厦门海底隧道联络通道工程为依托,利用光纤光栅传感技术,提出海底隧道联络通道施工过程中冻土、联络通道结构与盾构隧道结构的实时监测方法,研究联络通道冻结法施工过程中不同阶段的结构与冻土的相互作用,根据联络通道结构的受力特点,分别提出冻结法施工阶段和正常使用阶段的健康监测指标及监测方法,建立联络通道结构的健康监测及评价体系。研究结果表明:针对施工和使用2个不同阶段,该健康监测技术采取不同的监测指标和方法,可以有效地评价结构的安全性能,保证联络通道结构的安全。

Due to the long stabilizing time of the cross-passage structure constructed by freezing method,the health monitoring becomes an important method to guarantee the safety of the cross-passage. Firstly,based on the Xiamen Subsea Tunnel cross-passage project,a real-time monitoring method for frozen soil,cross-passage structure and the shield tunnel structure of cross-passage project of Xiamen Subsea Tunnel is proposed by using fiber grating sensing technology. And then,the interaction between the structure and frozen soil of different construction phases is studied;the health monitoring indices and monitoring methods for freezing construction phase and normal service phase are put forward based on the stress characteristics of the cross-passage structure. Finally,the health monitoring and evaluation system of the cross-passage structure is established. The results show that the monitoring indices and methods varying with construction and operation two phases,can effectively evaluate the safety performance of the structure and guarantee the safety of the cross-passage.