Numerical Simulation of Impact Caused by Construction of High-Rise Building upon Adjacent Tunnels

Abstract

In this study, stress deformation of Qingdao Jiaozhou Bay undersea tunnel terminal during high-rise building construction engineering was evaluated by real 3D numerical modeling using Midas software. The simulations were performed during high-rise building foundation pit blocks, stratified excavation unloading, and loading the whole building construction on adjacent existing tunnel. The influence of the whole process through tunnel convergence, tunnel vertical displacement and horizontal displacement, as well as deformation curvature changes of additional stress and lining were used to evaluate the tunnel safety. The results showed that excavation at depth of 6 m, the whole process of high-rise building construction on adjacent tunnel deformation was conform to requirements of control. As building load deformation reduced near tunnel ceiling, one side of foundation pit became bigger and far away from side of foundation pit but did not return to front of foundation pit excavation tunnel state. The construction load of adjacent tunnel excavation generated small additional stress with overall design no more than tunnel load values. Overall, the tunnel was in safe working conditions and the proposed research provide certain guidance and reference for similar projects.