ABSTRACT
The light-disturbance grouting technology has been widely used to rehabilitate the excessive deformation of tunnels caused by the unexpected surface surcharge. This study focuses on the effect of grouting with different grouting volumes on an over-deformed shield tunnel. Mean-while, the random finite difference method is adopted to consider the spatial variability of soil. The compression modulus of soil is highlighted and simulated with an anisotropic random field discretized by the Karhunen-Loeve expansion. After being verified by a typical case, Monte Carlo simulations are executed to quantitatively evaluate the influence of grouting on the mechanical response of tunnels under different grouting volumes considering the soil spatial variability. Results demonstrate that the soil spatial variability can affect the rehabilitation of the tunnel with the same grouting volume. Meanwhile, the distributions of the ratio of un-certainty results to its corresponding deterministic results under different grouting volumes are consistent.
