Study on the Aging Deterioration Curve of Tunnel Lining in Water Rich Area

Abstract

In this paper, the main influencing factors of tunnel lining deterioration are summarized, and the stability of surrounding rock, structural safety and the law of annual change of crack width under combined deterioration factors are analysed by numerical analysis method. The results show that the change of groundwater level has the most significant influence on the stability of surrounding rock. The rise of groundwater level makes tunnel appear obvious phenomenon of vault sinking and invert floating. When the water level has passed the vault, the lining structure has a significant reduction of safety factor and an increase of crack width. The deteriorated surrounding rock is prone to damage under the influence of groundwater, which directly shows an obvious expansion of plastic zone. The deterioration of lining material will not have a significant impact on the stability of surrounding rock and the structural safety factor. Among various deterioration factors, the position of wall feet on both sides and the invert are the most disadvantageous position in the tunnel. They are under high risk of cracks and seepage, which should be paid attention during the tunnel construction, operation and maintenance.