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.

Issue link: http://digital.tunnelingonline.com/i/986315

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Page 26 of 51

TUNNELINGONLINE.COM F E A T U R E S T O RY 2 7 TBM: TUNNEL BUSINESS MAGAZINE // JUNE 2018 heel – moving groundwater. Excessive groundwater velocity can hinder the formation of a freeze, lead- ing to windows in the frozen wall. We have learned how to diagnose the potential for this and address it early on with localized grouting to reduce the per- meability of the soil and achieve closure. It's all in reading the groundwater behavior and responding quickly and precisely. As history has shown in the many, many instances of projects significantly impacted or even abandoned because of groundwater inundation, this is often the riskiest and most challenging element of a project. It is hard enough to do it flawlessly when you have the right approach. An inappropriate or ineffective groundwater control approach is a recipe for disas- ter. It's critical, therefore, that groundwater should always be addressed early in the project cycle and the most appropriate groundwater control method or methods determined. Striking the right balance be- tween cut-off and dewatering is a key factor, and for this, experienced practitioners are essential. Paul C. Schmall, Ph.D, P.E., is a Senior Vice President and Chief Engineer for Moretrench, a Hayward Baker Company. Gary E. Taylor, P.E., LEG, is a Vice President with Hayward Baker's Western Division. Jet grout bottom seal for microtunnel retrieval box.

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