Abstract:Based on the engineering case of utility tunnel on North Yongxinghe Road crossing the elevated bridge of the new airport expressway node, MIDAS Civil finite element software is used to numerically simulate the foundation displacement of the elevated bridge on Yongxinghe node of the new airport expressway in order to ensure that the superstructure and pier columns meet the bearing capacity and normal use requirements, and to obtain the control and monitoring indicators of the bridge foundation displacement. At the same time, the three-dimensional finite element software MIDAS GTS NX is used to analyze various working conditions of the excavation of the foundation pit for the utility tunnel on North Yongxinghe Road in order to evaluate the impact of the foundation pit excavation scheme on the elevated bridge in the node of Yongxing River, and to determine the effectiveness and rationality of the foundation pit support scheme of utility tunnel. The calculation results show that the use of pile anchor support scheme for the utility tunnel foundation pit at the intersection node with the elevated bridge can effectively reduce the impact on the node elevated bridge, and the foundation displacement of the bridge meets the requirements of control and monitoring indicators, and the internal force of the pile foundation meets the requirements, which ensure the safety of the bridge and foundation pit. The reference is provided for similar underground structures crossing under bridge projects.
