Tunnel Business Magazine

OCT 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 TBM: TUNNEL BUSINESS MAGAZINE // OCTOBER 2018 from the owner's perspective. Accurate project records with copious photographs, information from data loggers on the tun- nel b erva- tions of ground reactions are all required when evaluating the validity of a claim of differing site condition. It is also necessary for the owner to make certain that the field work is being performed in accordance with contract re- quirements for the means and methods of construction but even more so for the ad- equacy of the finished facility. Tunnels are designed to last a long time and are very dif- ficult and expensive to repair if they are not constructed in a proper manner. Hence, all portions of the finished facility that could be impacted by adverse ground reactions must be observed and constructed in ac- cordance with contract requirements. It is more or less inevitable that some form of claim or dispute will develop during the construction of a tunneling project and the owner must be prepared to react in a positive and proactive manner to those situations. One of the most important aspects of successful tunneling as stated above is the ability of all parties associated with the project including owners, contractors, and designers (with the help of geotechnical engineers) to work together as a team. Conversely, it is not a good thing when this team devolves into a series of shouting matches. An excellent set of good quality project records from both the contractor and the owner contributes both to the team effort and to the timely and, hopefully, satisfactory resolution of contractor claims. Closing The entire process of risk assessment for tunneling projects is intimately associated with the services provided by geotechnical engineers, geologists, and engineering geologists. Tunneling risks, to a large degree, are related to how well one understands the existing ground condition, and, more importantly, the ground behaviors and/or reactions that will occur during tunnel construction. Hence, it is fair to say that successful tunneling projects go hand-in-hand with the successful provision of comprehensive contributions from knowledgeable and experienced geotechnical professionals. References Brierley, G.S. (Oct. 2017) "Incorpora - ment into the Contact Document." Tunnel Business Brierley, G.S. (Sept. 2017) "Intelligent Tunnel Design." T Brierley, G.S. (April 2017) "Differing Site Conditions OR Why I Believ ture is a Bitch" Tunnel Busi - Brierley, G.S. (September/October 2015) "Geotechnical " Geostra Brierley ch/April 2014) "So, Why Do You Want to Write a GBR?" Geostra Brierley, G.S. (Feb. 2014) "T t the Question?" Geo-Congress. Essex, R. (2007) "Geotechnical Baseline Reports for Con - struction, Suggested Guidelines." American Society of Civil Engineers. Hatem, D. (1998) "Subsurface Conditions: Subsurface Investigations and Geotechnical Report Preparation." Chapter 3 Hatem, D. (1997) "Geotechnical Baselines - Professional Liability Implications." The CA/T Professional Liability Reporter Edgerton, W. (2008) "Recommended Contract Practices for Underground Construction." Society f , and Exploration, Inc. Gary S. Brierley is president of Dr. Mole Inc. He is a chairman of the TBM editorial advisory board and a frequent contributor to the magazine. 2 9 F E AT U R E S T O R Y

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