ABSTRACT
An adjacent loading pile in congested urban areas will inevitably cause an adverse effect on existing tunnel. Meanwhile, it is commonly accepted that soil exhibits spatial variability. A comprehensive study is performed on the effect of loading pile on the response of adjacent tunnel embedded in spatial variability soil. Herein, the random finite difference method (RFDM) is used. Monte Carlo simulations (MCS) approach is combined with finite difference analysis. Elastic modulus of soil is considered as a random variable. The soil is modeled with horizontally stratified anisotropic random fields using K-L expansion technique. An assessment method of tunnel deformation affected by adjacent loaded pile is proposed. The horizontal and vertical convergence and distortion degrees (α and β) can effectively evaluate the tunnel deformation in this situation. The results show that there is a significant amplification effect with the loading increase when considering soil spatial variability.
