Abstract
Zonal disintegration is commonly encountered during the construction of tunnels at large depth. To study the formation and evolution mechanism of zonal disintegration in deep tunnels, a geo-mechanical model test is conducted under three-dimensional condition. The results reveal that: 1) with the proceeding of tunnel excavation, the displacements and the stresses around the tunnel present oscillating variation with alternating peak and trough. 2) Four annular rupture zones can be found around the tunnel, where the distance between the outermost rupture zone and the tunnel periphery is approximately 9.6 m. 3) The rupture zone first forms on the sidewalls of the tunnel, and then gradually develops to the interior of the rock mass until a complete ring-shaped rupture zone is formed. 4) The evolution of zonal disintegration is affected by the shape of cross section. The reproduction of zonal disintegration in laboratory can effectively reveal the formation mechanism and develop the control measures. The results obtained will provide important scientific basis for the safety construction of deep underground engineering.
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Acknowledgments
This study was financially supported by Natural Science Foundation of China (NO: 42172292), Taishan Scholars Project Special Funding and Shandong Energy Group (NO. SNKJ2022A01-R26).
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Xue, T., Zhang, Q., Duan, K. et al. Geomechanical Model Test on the Zonal Disintegration of Deep Tunnel in Jinping II Hydropower Station. KSCE J Civ Eng 27, 4635–4645 (2023). https://doi.org/10.1007/s12205-023-1062-4
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DOI: https://doi.org/10.1007/s12205-023-1062-4