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首页> 外文期刊>Tunnelling and underground space technology >Design, construction and monitoring of an underwater retaining wall close to an existing immersed tunnel
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Design, construction and monitoring of an underwater retaining wall close to an existing immersed tunnel

机译：Design, construction and monitoring of an underwater retaining wall close to an existing immersed tunnel

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摘要

In the framework of the improvement of the traffic around Amsterdam, a new immersed tunnel has been constructed very close and somewhat deeper along the existing immersed tunnel built in the 1960s. A partition (retaining) wall is needed to maintain the existing tunnel while performing the dredging works for the immersion trench of the new tunnel. Due to the quite poor state of the tunnel and the short distance between the new and existing tunnels, the construction of the partition wall and the dredging works were considered as a main project risk. During one year, the movements of the existing tunnel have been monitored to understand its behaviour. A detailed analysis of possible causes of deformation of the existing tunnel and of the displacements at its immersion joints during installation of the partition wall and the dredging works has been performed. Requirements to the allowable displacement at the immersion joints and hence to the design and construction of the partition wall have been derived from these observations and analyses. Extensive monitoring has been performed during the installation of the partition wall applying the principles of the observational method. Based on this monitoring, criteria were re-evaluated during the works and a safe and damage free operation has been continuously monitored all along the construction period. This paper describes the approach applied to the design, execution and monitoring of the existing tunnel and focusses on the analysis and mitigation of main design and construction risks, as well as the monitoring system and threshold values applied. The difficulties encountered during the installation and the corrective methods are described.

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