ABSTRACT

For the construction, maintenance and reinforcement of the tunnels, the new concept called asset management has been introduced and paid attention recently. For the asset management, the key issue is how to define, monitor and assess the performance of the tunnels. The newly developed three-dimensional Underground Space Information Management System (USIMS) enables to store and integrate all types of information related to the construction, inspection, maintenance and reinforcement systematically with a 3-D virtual world. In this study, for the purpose of the tunnel maintenance and health assessment of thetunnels, the comprehensive tunnel database was constructed using USIMS based on the geological data at the tunnel site, construction data, regular inspection records and photo, and etc., which were stored as a hard copy and/or digital format. By updating this tunnel database, time evolution of the tunnel status such as deformation etc. can be presented with clear 3D vision.

1 INTRODUCTION

Due to the economical, political and social changes in Japan, the construction industry has to shift the focus from building new infrastructures to maintaining existing infrastructures. The life of the infrastructures will be extended by regular maintenance considerably and this is especially true for tunnels, the new concept called asset management has been also introduced and paid attention. One of the key issues for asset management for tunnel is how to define, monitor and assess the performance of the tunnels. It is also important to register geological and construction related data and store them for the future use such as the maintenance and repair/ reinforcement of the tunnels.

At each stage (construction, maintenance and repair/reinforcement), large amount of data are gathered that should be stored and retrieved for the later stage. The newly developed three-dimensional Underground Space Information Management System (USIMS) as presented in Ohnishi et al. (2005) enables to stores and integrate all types of information related to the construction, inspection, maintenance and reinforcement systematically with a 3-D virtual world.

In this study, for the purpose ofthe tunnel maintenance and health assessment of the tunnels, the comprehensive tunnel database was constructed using USIMS based on the geological data at the tunnel site, construction data, regular inspection records and photos, and etc., which were stored as a hard copy and/or digital format. By updating this tunnel status such as deformation, cracks etc. can be presented with clear 3D vision.

2 The USIMS: outline

The USIMS was developed and extended to construct comprehensive tunnel database and used for the regular inspection work of tunnel without any difficulties and time consuming works for tunnel engineers and managers. The basic tunnel database mainly consists of the geological data at the tunnel site (rock type, fractures, etc), tunnel profiles (length, cross, section, etc.), tunnel construction data (excavation method, tunnel support patterns, concrete lining, excavation face, etc).

The main features of USIMS are as follows;

  1. pre-existing documents (hard copies) such as old construction data, inspection results, etc can be transcribed and treated together with current CAD based data,

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