Modified image analytical solutions for ground displacement using nonuniform convergence model

Abstract

Based on the image theory, the analytical solutions of tunneling-induced ground displacement were derived in conjunction with the nonuniform convergence model. The reasonable value of Poisson ratio in the analytical solution was discussed. The ground settlement width parameter which could reflect the ground condition was introduced to modify the analytical solutions proposed above, and new analytical solutions were presented. To evaluate the validity of the present solutions using the nonuniform convergence model, the results were compared with the observed values for four engineering projects, including 38 measured data of ground settlement. The agreement shows that the present solutions using the nonuniform convergence model are effective for evaluating the tunneling-induced ground displacements.

Keywords

subway tunnel / ground displacement / image method / ground settlement width parameter