| A nonlinear three dimensional numerical model for slurry shield tunneling process was established based on a cross-river tunnel project. The simulation of slurry shield tunneling process was performed on a shared memory parallel computing platform by transferring stiffness method in a stepwise procedure. The slurry shield tunneling machine advanced over a hundred meters until crossed the flood levee. In order to simulate the complicated interaction between different construction components in different construction process, methods were given to take into account of all relevant construction components. Those construction components modeled were: slurry pressure on excavation face, over-cut of blade, contact between shield skin and soil, time dependent characteristic of grout material, the loading of back-up trailer et al. The simulation results were validated by comparison with field measurements from test section, and settlements of ground during tunneling process were predicted. The calculation efficiency, speedup ratio and the contact impact on the calculation efficiency of slurry shield tunneling process simulation on SMP computing platform were investigated. |