Mechanical behavior of water diversion tunnel lining before and after consolidation grouting

Abstract

Based on the engineering background and finite element simulation aboutthe diversion tunnel of Dongsong Hydropower Station, the mechanical behavior analyses about the diversion tunnel lining between and after the consolidation grouting are conducted respectively.The results present that the consolidation grouting can reinforce the rock effectively, modify the crack propagation around the tunnel, improve the stress condition about the lining, and enhance the anti-deformation and anti-fracture ability of the lining.However, the consolidation grouting will cause the significant additional load in the lining, the simulating results show that the consolidation grouting has caused 30% augment about the maximum stress in the lining, and in turn caused the secondary deformation, thus, the inappropriate consolidation will cause the increasing of compressive stress, even the possibility of the thorough damage of the lining.Finally, through different construction meghods, the additional stress of the lining in consolidation grouting will be decreased effectively, thus the additional stress in segment consolidation groutingwill be smaller than that of full hole grouting at a time.