Abstract：Research purposes: In order to reveal the deformation and failure mechanism of super long-span tunnel in tertiary semi diagenetic stratum with high water content, in this paper, the dynamic process of deformation and instability of Bailuyuan tunnel without support is simulated by discrete element analysis, and the variation law of particle indirect contact force and the derivation process of surrounding rock cracks in the process of tunnel collapse are studied. Research conclusions: (1) Tunnel collapse has experienced four stages of sharp deformation, local failure, failure development, and overall collapse. (2) During the deformation and failure of the tunnel, the cracks at the sidewalls on both sides of the tunnel gradually develop into through joints with an included angle of 44° with the ground. (3) When tunnelling in the high water content section or water-rich section of the tertiary semi diagenetic strata, a reasonable grouting scheme should be put forward on the basis of proper treatment of waterproof and drainage, the systematic bolts should be cancelled, and the feet-lock bolts should be highlighted. (4) The research results can provide a theoretical basis for the design and construction of such tunnels.
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2022, Vol. 39 
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