Abstract:

In the design of the risky works of mined running tunnel crossing underneath largescale interchange in urban areas, the construction cost should be minimized and the construction period should be shortened as far as possible and the construction should be executed easily under the condition that the safety of the interchange is guaranteed. A running tunnel of Beijing Metro crosses underneath the pile foundations, enlarged foundations and retaining walls of a largescale interchange in urban area. The risky works of the running tunnel is designed systematically and in detail by means of numerical simulation, analysis on the load bearing capacity of the bridge piles and analysis on reinforcement of the retaining walls. The design result is handed over for construction execution. During the construction, relevant data is accumulated and analyzed, and the analysis result is fed back to the design so as to optimize the design. In this way, the concept of informationaided construction and design has been fully executed and the investment of the works has been well controlled under the condition that the safety of the interchange is guaranteed.

Key words: mining method, running tunnel, interchange, bridge pile, retaining wall, risk, design optimization