Issue 58

W. Frenelus et alii, Frattura ed Integrità Strutturale, 58 (2021) 128-150; DOI: 10.3221/IGF-ESIS.58.10

- The extent of degradations of the mechanical properties for surrounding rocks and its influence on long-term stability of deep tunnels. - The overall magnitude of EDZ and its influence on long-term life of deep rocks tunnels based on unloading effect. - How excavations methods influence the rocks bearing capacity of deep tunnels based on time-dependent effect. - The total damage and deformations generated in the surrounding rocks after TBM and/or Drill-and-Blast excavations based on creep effect. - Comparison of the convergence deformations magnitude between tunnels excavated by TBM and DB under same geological and hydrogeological conditions. - Long-term Stability Analysis of deep tunnels based on post-excavation evaluation. - The degradation of the fracture toughness and fracture energy in deep rocks tunnels after TBM and Dill-and-Blast excavations.

Figure 11: Proposed methodologies to control and mitigate the effects of excavations methods on the long-term stability of deep rocks tunnels.

C ONCLUSIONS he excavations methods have considerable influence on long-term stability of deep rock tunnels. The main conclusions related to this paper are summarized as follows: T

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