ABSTRACT
Within the civil engineering profession, vulnerability is a fundamental component in the evaluation of risk, and is often used to assess the level of potential damage or degree of loss of structures when they are affected by disasters. Based on the two-stage method, this paper uses mindlin solution, Pasternak foundation model and Timoshenko beam theory to obtain the mechanical and displacement responses of the existing tunnels above the shield tunnel. Then, the parameter values of the standard condition are specified, and the influence of the parameter on excavation disturbance intensity and structural resistance ability in shield under-crossing existing tunnels is analyzed. Finally, based on the quantitative vulnerability calculation model, considering the disturbance intensity (I) of shield tunneling and the resistance ability (R) of the existing tunnel, the vulnerability evaluation model of the existing tunnel under the influence of the under-crossing shield tunnel is established.
