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Erschienen in:
2021 | OriginalPaper | Buchkapitel
Evaluation of Damaged Zone During Cross-Passage Excavation by Means of CPT Test Result Analysis
verfasst von : Giovanni Quaglio, Fabrizio Peruzzo, Massimo Merlo, Piergiorgio Grasso
Erschienen in: Challenges and Innovations in Geomechanics
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Abstract
This paper presents the methodology applied for assessing the volume of perturbed soil, caused by a piping phenomenon occurred during the excavation of a cross passage (connecting two tunnels excavated with Variable Density TBMs), through the results of the CPT and CPTu tests. Likewise, the approach was used to estimate the positive effect of consolidation countermeasures. It is interesting to note that other in-situ tests have been performed with the same purpose, but without satisfactory results. The main evidences were provided by CPT and CPTu probes, from which it has been possible to define, the highly damaged and weakened areas. By further refining the analysis (also thanks to a 3D geological model done with Leapfrog©), a larger volume was identified as “stress disturbed”, allowing for the definition of the area requiring treatments. This case study was subsequently implemented in the risk assessment procedure for tunnel projects excavated in similar environments.