Research On The Classification Of Tunnel Hydrogeological Types Based On Fuzzy Theory

Tunnel water damage is one of the five major disasters that threaten the safety of tunnels.Water and mud bursts in tunnel construction can cause equipment loss,casualties,delays in construction,increase costs,and cause environmental problems such as ground subsidence,reduction and depletion of groundwater resources.Therefore,the research on hydrological and geological classification of tunnels is of great theoretical significance for the prediction of tunnel water inflow and the management and control of water damage risks during tunnel construction,and it has extremely high engineering applications for tunnel drainage,tunnel construction management,and tunnel advance geological forecast value.Based on a review and research of previous achievements and detailed research based on the project,the thesis combines the basic principles of fuzzy mathematics and comprehensively and systematically analyzes the factors affecting tunnel water damage,comprehensively selecting geological conditions,hydrogeological conditions,Three factors,including tunnel parameters and construction technology,are used as secondary evaluation factors to comprehensively select the topography and geomorphology,geological structure,formation lithology,karst development characteristics,hydrogeology,precipitation,surface hydrology,tunnel technical parameters,water drainage measures,Construction management and other 10 impact factors are divided into five levels:complex,more complex,medium,simple,and simple.Classify the tunnel hydrogeological type.Construct a comprehensive fuzzy evaluation model to evaluate the tunnel hydrogeological type.The fuzzy evaluation model evaluates the hydrogeological type of Gulong Tunnel on the Guihuang Expressway.The thesis research has achieved the following results:?1?The combination of the direction of the tunnel and the topography.The combination of the parallel terrain directly below the valley and the cross-river terrain?H3Z3?,the combination of parallel terrain directly below the valley and basin-like terrain?H3Z4?,and the parallel terrain below the valley.The cross-river topography combination?H4Z3?and the valley-side parallel topography and basin-shaped topography combination?H4Z4?have the greatest impact on the tunnel water flow;folds,faults,and joint fractures all have a greater impact on the tunnel water flow;fragmented structures Rocks with loose structures and loose structures are likely to cause a large amount of water gushing in the tunnel.When the number of karst depressions and sinkholes in the mountainous area of the tunnel is greater than 3/km2,the water inflow from the tunnel is large,and the probability of water damage is increased.The amount of water is large and stable;the more perfect the tunnel water disaster prevention work,the less the probability and loss of water disasters.?2?On the basis of comprehensive previous research results and detailed engineering investigations,select quality conditions,hydrogeological conditions,tunnel parameters,and construction technology as the secondary influencing factors for the hydrogeological type of the tunnel,and select topography,geological structure,and stratum.Lithology,karst development characteristics,hydrogeology,precipitation,surface water,tunnel technical parameters,water drainage measures,construction management,etc.are the first-level factors for judging the hydrogeological type of the tunnel.Through the analytic hierarchy process,the structure is compared in pairs,and the calculation is performed.The weight vector method comprehensively determines the weights of the second-level evaluation factors are 0.35,0.45,and 0.20,and the weights of the first-level evaluation factors are:0.30,0.24,0.20,0.26,0.45,0.25,0.30,0.30,0.45,0.25;Tunnel hydrogeological types can be divided into five levels:complex,more complex,medium,simple,and simple.Comprehensively using the basic principles of fuzzy mathematics,the first-level fuzzy calculation function of the evaluation model is B₁=A₁·R,B₂=A₂·R,B₃=A₃·R,and the second-level fuzzy calculation function is,thus constructing the tunnel hydrogeological type Comprehensive fuzzy evaluation model.?3?The comprehensive fuzzy evaluation of the hydrological and geological types of the Gulong Tunnel on the Guihuang Expressway was carried out using the constructed comprehensive fuzzy evaluation model.The type membership degree B=|0.12 0.25 0.420.14 0.08|shows that the hydrogeological type of the Gulong Tunnel is ? Grade?medium?-based.