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Quantifying Spatial Geotechnical Uncertainty to Advance the Practice of Risk Assessment and Decision-Making in Tunnel Projects
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2021-08-17
[PDF-19.41 MB]
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Edition:Final Report
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Abstract:The largest element of technical and financial risk on any tunnel project lies in the ground conditions. The conventional practice of developing deterministic interpretations of ground conditions does not account for ground spatial variability nor quantify uncertainty. With the increased number of claims and litigations, it is evident that the conventional practice is ineffective in assessing ground spatial variability and uncertainty. Geostatistics-based methodologies are developed in this report to provide advantages over the qualitative and subjective deterministic interpretation of ground conditions with the probabilistic assessment of ground conditions as outputs. The geostatistics-based methodologies presented in this report are developed with a vision to assist the tunneling community in (a) analyzing ground spatial variability and uncertainty and (b) tying the results from geostatistical modeling to tunnel risk assessment. The latter is expected to help the tunneling community realize the advantages of geostatistical modeling-based methodologies in improving tunnel construction performance.
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