ABSTRACT
Grouting has long been regarded as one of the most effective measures to prevent water inflow during tunnel construction. The grouting ring around the tunnel forms a low-permeability zone, reducing water inflow and providing protection for safe excavation. The groundwater pressure within the grouting ring may increase or decrease compared to its original value, depending on factors such as grouting, drainage design, and whether the tunnel structure is waterproof. Aiming at the influences of grouting and the related factors on tunnel structure, this study adopted two-dimensional hydro-mechanical coupling analysis considering different conditions of coefficient of lateral earth pressure, boundary water pressure, range of grouting and whether the lining is waterproof. The results show that pore water pressure accumulates at the outer grouting boundary. Grouting increases lining moment to about 113-150% of those without grouting.
