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Applying Probabilistic Approaches for Reliable Sequential Excavation Method Tunnel Design and Construction
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2022-04-04
[PDF-14.78 MB]
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Abstract:The sequential excavation method (SEM) is commonly employed in soft ground urban tunnel construction. Large-scale SEM in the midst of urban infrastructure is complex because allowable ground deformations are relatively small. Considerable uncertainties exist during SEM design and construction due to limited knowledge of ground conditions and flexible construction measures as allowed by contractual guidelines. The conventional practice using deterministic analysis to evaluate SEM-induced ground and structural responses does not account for the uncertainties, and therefore is less adaptive and robust, leaving the SEM design and construction blindly risk-taking. Given the considerable technical and financial risks taken by SEM projects, it is imperative to develop efficient and accurate probabilistic approaches to help designers and contractors make well-grounded decisions based on updated knowledge of risk along the SEM construction process.
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