Abstract：Research purposes: The salt mine with a depth of 500 m underground was mined by water solution method in Central-south China, and the deformation of the surface in the goaf area is serious. The outer line of the railway hub was designed to pass through the mining area with great engineering risks. Based on the measured deformation data of the surface, this paper studied the law of ground deformation induced by water mining, analyzed the risk of ground collapse with the dome of natural equilibrium and geophysical methods, determined a reasonable line channel, and proposed the comprehensive prevention measures for the railway crossing the deep buried water-soluble goaf. Research conclusions: (1) There were two subsidence centers with cumulative subsidence of 927 mm and 843 mm on the surface. The subsidence center was located on the ore pillar, and the goaf area had been connected. (2) The risk of the overlying rock collapsing to the ground was high in the south passage. However, only parts of the shafts in the north passage were broken and lost, and the engineering geological conditions were relatively good. And the north passage was selected as the final railway passage. (3) It was predicted that the duration of ground surface movement after the mining stop was shorter than the construction period, and comprehensive treatment measures such as mining stoppage, well closure, and roadbed subsidence widening in the mining area were proposed. The ground deformation tracking monitoring showed that the comprehensive treatment effect was excellent. (4) The maximum post-construction settlement of the line predicted by the Poisson function was 4.1 cm, which met the conditions for opening to traffic. The railway line was officially opened to traffic in August 2020. (5) The research results can provide reference for railway route selection and treatment in similar complex goafs.
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2022, Vol. 39 
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