Tidal induced variations in water levels trigger the redistribution of stress in the seabed strata, impacting the stability of the surrounding rock mass during subsea tunnel excavation. Set the Second Subsea Tunnel in Jiaozhou Bay, Qingdao as engineering background, a multiphase large deformation numerical calculation method, Material Point Method, is employed to analyze the destructive response of the tunnel face's surrounding rock mass under tidal influences. Through a comparison between numerical simulations and on-site monitoring data, the feasibility of the Material Point Method for numerical simulation is validated. By simulating water level changes for 196 groups with varying rock mass grades, the study investigates the distribution and characteristics of seabed settlement, rock mass deformation, and the plastic failure zone. The results indicate that: A decrease in water level amplifies the deformation of the subsea tunnel face during the construction period. The combination of water level changes and unfavorable rock mass parameters is identified as a critical factor leading to instability in the subsea tunnel face, revealing 16 sets of parameter combinations that induce significant deformation instability in the tunnel face.
Xing Zengliang
,
Zhang Le
,
Tan Minglun
,
Zhou Mingliang
,
Huang Hongwei
. Research on the Influence of Tide on the Stability of Subsea Tunnel Face[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 381
-390
.
DOI: 10.20174/j.JUSE.2024.S1.45
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