Deformation of Sandy Ground Induced by Tunneling of Super-Large-Diameter Shield—Influence of Buried Depth of Tunnel and Relative Density of Sand

The mechanical properties of sandy soil depend on both the confining pressure and state compactness. Therefore, buried depth tunnel relative density sand are key factors that affect ground deformation induced by tunneling a super-large-diameter shield. In this study, parameters SANISAND constitutive model first calibrated based triaxial test data for Foshan silty fine sand. Then, actual project, two-dimensional finite-element analysis is established to investigate width maximum value settlement trough, volume loss ratio, characteristics summarized analyzed 13 cases. results show as ratio diameter increases, anti-disturbance ability layer construction increases stratum reduces correspondingly. denser smaller around tunnel, more significant shear-induced expansion at haunch; partially makes up caused excavation arch crown.