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  An Integrated Framework to Optimize Site-Investigations for Tunneling Applications

  An evaluation of the heterogeneity and variability in the sub-surface conditions is an essential aspect in the planning, design, and construction of tunneling projects. The low density of sampling in tunneling projects and the practice of locating the boreholes based on the individual experience makes a comprehensive assessment of sub-surface conditions challenging. This paper presents a rational framework that integrates spatial uncertainty, consequences of tunneling risks, and site accessibility constraints to identify optimal locations for subsequent site-investigation(s). Geotechnical site-investigation data from a soft-ground tunneling project situated in an urban environment is used in this study. Multiple equiprobable realizations of the geological-geotechnical conditions are simulated on a 3D random field and are post-processed to quantify the spatial uncertainty. The results from the study provide insights into the advantages of the framework over traditional siteinvestigation campaigns in minimizing uncertainty and mitigating risks within tunneling projects.

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