Prediction Of Water Inflow From Xishanying Tunnel Based On Coupling Of Seepage Field And Stress Field

In recent years,along with economic development,infrastructure construction has received increasing attention,and more and more highway tunnels have been completed or are under construction.Due to the particularity of tunnel construction,especially in the western mountainous areas with complicated geological conditions,various disasters will occur during the construction of the tunnel,resulting in economic and loss of life.Among them,the water inrush in the tunnel is a very common disaster that is also easy to cause losses.Therefore,the study of water inrush in tunnel construction is extremely important.Based on the Xishanying Tunnel Project in Yunnan Province,this paper uses the relevant theories of set pair analysis,order relationship method,and entropy weight method to evaluate and classify the flooding hazard levels of tunnel sections.Aiming at the high-level tunnel water gushing section,based on the coupling of seepage and stress,the ABAQUS software is used to model and analyze it,and the tunnel water gushing amount under the condition of lining and unlining is obtained.The control variable method is used to analyze the relationship between the water influx of the tunnel under different groundwater levels.The main research results are as follows:(1)According to the field hydrogeological conditions and engineering geological conditions of the Xishanying Tunnel,nine evaluation indexes were selected to evaluate the water gushing risk of the eight tunnel sections of the tunnel.According to the fuzzy set pair analysis method combined with the order relationship method and the entropy weight method,eight cross-section risk situations are obtained,among which cave section 1,cave section 2,cave section 6,cave section 8 are in the level IV risk category,and the remaining four cave sections are in the Ⅴ Level risk category.(2)In order to verify the rationality of the seepage and stress coupling theory,the ABAQUS software was used to analyze the tunnel sections with a higher risk level of water inrush in the tunnel,and a separate stress field model and a dual field coupling model were established to obtain the tunnel surrounding rock and lining in two cases Cloud,stress,displacement,strain,etc.The two-field coupling stresses,displacements,and strains are larger than the individual stress fields.(3)Select the tunnel section with high risk of water inrush in the tunnel and use ABAQUS software to model it to solve its water inflow.Two models of tunnel without lining and tunnel with lining were established respectively,and the amount of water inflow in the tunnel was calculated and analyzed in two cases.In addition,the influence of different groundwater level elevations on the water inflow of the tunnel was studied by using ABAQUS.The water gushing conditions of the tunnel were simulated under the conditions of 35 meters,40 meters,and 45 meters,respectively.Curves as a function of groundwater level.