Abstract: It is critically important in metro deep excavation to continuously monitor the deformation and its progressive development. This paper presents the numerical evaluation results of a metro station deep excavation of Transit No. 29 Line in Wuhan. The numerical analysis model was established based on the site geological and hydrological properties and the analytical deformation results were compared with the monitored results during the construction. The following results can be obtained: 1) when the excavation is within 5 meters, small values of deformation are observed. When the excavation depth is between 5 m and 15 m, the observed lateral deflection is gradually increase with a maximum lateral deflection of 19.22 mm. The maximum lateral deflection is at a depth of 12.3 me below the ground (or 2H/3, H is the depth of excavation). After the maximum lateral deflection, the observed deformation decreases with depth to the ground surface 2) the maximum ground subsidence occurs at a distance of H/2 to the edge of excavation, the ground settlement is between 6.65 and 9.15 mm, which is correspondent to a range of 0.04% to 0.05% of the excavation depth. From the construction monitoring results, both the lateral deflections observed at the excavation supporting structure and the settlement at the ground surface are satisfactory and meet the code requirement.

Key words: ABAQUS, deep excavation, displacement, settlement