Abstract A large diameter shield tunnel (bi-directional and four-lane) on the north ring road of Hangzhou is to be constructed and will pass under a three-hole continuous frame bridge. The safety of the railway frame bridge and railway operation during tunnel construction is evaluated, and some control measures are put forward. The settlement of the railway frame bridge under different ground loss ratios is predicted by the Peck formula, and the settlement and stress variations of the railway frame bridge during shield tunneling is analyzed by ANSYS finite element considering the two cases of a reinforced and non-reinforced soil mass. The results show that driving-induced ground loss can be effectively reduced (within 1%) and that the values of settlement and additional stress meet the safety requirements if the soil mass is reinforced.
Abstract：
A large diameter shield tunnel (bi-directional and four-lane) on the north ring road of Hangzhou is to be constructed and will pass under a three-hole continuous frame bridge. The safety of the railway frame bridge and railway operation during tunnel construction is evaluated, and some control measures are put forward. The settlement of the railway frame bridge under different ground loss ratios is predicted by the Peck formula, and the settlement and stress variations of the railway frame bridge during shield tunneling is analyzed by ANSYS finite element considering the two cases of a reinforced and non-reinforced soil mass. The results show that driving-induced ground loss can be effectively reduced (within 1%) and that the values of settlement and additional stress meet the safety requirements if the soil mass is reinforced.
2013, Vol. 50 