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Reasons from ground-structure-water-air interaction, convergence-support interaction, and face-stability limit states through Q/RMR/GSI classification, Hoek-Brown numerical models (PLAXIS, FLAC), Peck settlement troughs, and DAUB-ITA/NFPA 502 standards while treating face blowout, squeezing, invert heave, and TBM jam in mixed face as first-class failure modes.