The collapse of stratum induced by subsurface excavation for a shallow tunnel in water-rich region is common in urban tunnel engineering. Although scholars have conducted numerous research on the stability of the soil mass above shallow-buried tunnel roof, the collapse characteristics of the soil mass induced by shallow-buried tunnel construction in water-rich strata have not been well investigated. In this work, a new three-dimensional collapse mechanism of the stratum above shallow-buried tunnel roof is generated “point by point” based on t...