Abstract: Taking Qingxiushan station of Nanning rail transit line 3 as an example, this paper studies the deformation law and construction method of the deep tunnel construction of the Paleogene semi diagenetic subway station, designs a special monitoring scheme, analyzes and studies the monitoring data of the large section construction of the mining method, and focuses on the deformation of the primary and secondary structures of different construction methods, such as CD method and three step method. The research shows that the control of groundwater can ensure the safe excavation of deep tunnel and control the deformation of surrounding environment. the CD method and three step method can meet the requirements of deformation of primary support structure in Paleogene semi-diagenetic siltstone, argillaceous siltstone, local siltstone and other strata; the three step method is more economical when both CD method and three step method can be selected.

Key words: Paleogene, semi-diagenesis, subway station, deep buried tunnel, mining law, deformation law