| Based on Nanjing Weiqi road project, settlement of ground and settlement, horizontal displacement, axial force of adjacent viaduct pile foundation induced by unilateral tunneling and bilateral tunneling are studied. The perfect distance of bilateral tunneling is also studied. The influence of adjacent viaduct pile foundation induced by tunneling is studied under the condition: Rock embedded or not, different distance between pile and out tunnel contour, different pile length, different section width of pile. Finally, several constructive suggestions for reducing the adverse effects on adjacent piles by tunneling are suggested and effective monitoring plan is put forward. The main conclusions of the numerical test are as follows:(1)Whether it is unilateral tunneling or bilateral tunneling, the ground settlement and horizontal displacement, settlement, incremental axial force of the adjacent pile induced by tunneling are all less than the criterion of the corresponding norms. The project design is entirely feasible.(2) The reasonable distance between the bilateral tunnel is 80m ~ 100m.(3) In order to control the settlement and axial force, it should be rock-socketed pile.(4)When the distance between pile and out tunnel contour increases, settlement, horizontal displacement as well as the incremental axial force of the pile is greatly reduced, increase the distance can evidently reduce the adverse effects.(5)For super-long pile, increasing the pile length has little effect on horizontal displacement; the displacement should not be reduced effectly by pile length.(6)Increaseing pile diameter can reduce the horizontal displacement obviously; can increase the lateral friction and end bearing of the adjacent pile, when the horizontal displacement and axial force as a control, the increase in pile length may be one effective way.
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