This paper presents an analytical simulation procedure by a hybrid FEM based on nonassociated flow rule for ground deformation during shield- tunneling. Firstly, trap door test results for sand are analysed in terms of load, displacement and shearing strain through three kinds of FEM and their applicabilities to the analysis of ground behaviors are estimated. Secondly, actual field measurement results of ground deformation are analysed without stress release rate in accordance with the execution sequences by the same analytical methods.
Consequently the hybrid elastic-plastic FEM method, though roughly estimated soil properties are adopted for the calculation, is concluded to effective for analysis and prediction of ground deformation during shield tunneling.