Tunnel Business Magazine

JUN 2018

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

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TUNNELINGONLINE.COM F E A T U R E S T O RY 3 7 TBM: TUNNEL BUSINESS MAGAZINE // JUNE 2018 O n - D e m a n d We b i n a r 2018 Webinar Watch this FREE Webinar today! Visit tunnelingonline.com/webinars Digitizing Tunnel Monitoring for the Construction Phase How Wireless Monitoring Systems help track performance, identify issues and decrease operational risks Presented by Produced by If you are involved in tunnel construction projects, you know that it´s key to monitor the stability of the surrounding ground structures and underground excavations to decrease potential risks and control operational costs. But what if you work with manually or automatically collected monitoring data, which is outdated quickly and not available in real time? Find out how Wireless Monitoring Systems based on IoT technology can help you obtain asset information timely, inform decision makers and prompt appropriate action when necessary. The purpose of this webinar is to introduce wireless technologies for remote, real-time monitoring and its application areas to construction and service companies, share real-world case studies and provide you with the tools to build your own monitoring strategy. geotechnical interpretation. Input from the geotechnical engineer should be considered both early in the project scoping and continuously sought during construction. This paper sets out to provide both a ready reference to project managers as to when and what input they should seek from geotechnical engineers and give guidance to geotechnical engineers on how to present information to project managers in such a way that they can make informed decisions around project management, reducing disputes and ulti- mately providing better outcomes for the industry. TBM SELECTION STAGE election is critical to the success of the project. Once made, this decision cannot easily be changed. Tunnel purpose, type and design are not the only criteria to sele election chart Figure 1, which is used by a lot of contrac- tors, is not the recommended method to sele TYPE CONS BEST FOR Slurry Type • Require significant backup systems and power • Drive can be hindered by large stones and boulders • Allows soft, wet, or unstable ground to be tunnelled • Suitable for ground with high water pressures • Limits ground settlement and produces a smooth tunnel wall Earth Pressure Balance (EPB) • Not suitable for ground with high water pressures • Not suitable for hard rock conditions • Allows soft, wet, or unstable ground to be tunnelled • Limits ground settlement and produces a smooth tunnel wall Shield type • High capital cost • Difficult to transport • Very sensitive for weak ground conditions • Limited options to deal with ground water • They offer a continuous and controlled means of tunnel- ling capable of high rates of advance under favourable conditions Table 1 - Basic comparison of TBM types

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