The model is first verified by simulating the undrained triaxial tests on K0 consolidated Shanghai clay. The influence of the clay adhesive stress on the ground settlement and deformation shape under the disturbance of ground loss in tunnel construction is not significant.Ībstract = "According to the secondary development platform provided by FLAC3D, the anisotropic structured clay model(ASCM) is implemented using the coding language of C++. It is shown that the influence of clay structure on the ground deformation shape under the disturbance of ground loss in tunnel construction is not significant while that the ground settlement at the tunnel axis increases significantly due to structural deterioration. Finally, the influence of clay structure on tunnel construction is numerically analysed. With increasing the spacing distance of twin-tunnel, the settlement curve shape changes from "V" to "W" with two peak points located above the tunnel axis.
The profiles of the ground settlement curve like a "V" with the peak point located near the centre of the two tunnels with a spacing of 1.5D. The results show that the user-defined ASCM constitutive model can be used for numerical simulation of 3D tunnels and that the calculated ground surface settlement curves due to tunnel construction agree well with measurements of the centrifugal model tests. Numerical simulation of ground loss during tunnel construction is then performed, and the influences of clay structure and adhesive stress on ground surface settlement are analysed.
The model is first verified by simulating the undrained triaxial tests on K 0 consolidated Shanghai clay. According to the secondary development platform provided by FLAC 3D, the anisotropic structured clay model(ASCM) is implemented using the coding language of C++.
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