Hydrogeological Characteristics and Water Inflow Prediction of Deep Buried Highway Tunnel in Taihang Mountain Area
The hydrogeological units in Taihang Mountains are complex and diversified.In order to ac-curately predict the water surge area and water inflow of Taihang Mountain long tunnel,the hydro-geological conditions of the tunnel site are analyzed in detail,and the water inflow of the main tunnel is compared and predicted by various methods.The results show that the fracture space of fissure wa-ter-bearing rock group in lower Proterozoic metamorphic clastic rock is small and the water richness is weak.The fracture network of the water-bearing rock group in the clastic rock of Changcheng system is well connected,and the water retention in the deep rock fracture is large.The karst water aquifer of Zhangxia Formation of Cambrian system is highly water-rich,and the static water level elevation is relatively stable in the region.The results of pumping test show that the permeability coefficient of karst fissure aquifer in this region is generally larger than that of lower Proterozoic metamorphic clas-tic rock.However,due to the different development density of dissolution fissure,the water-rich abil-ity of carbonate fissure water-bearing rock groups in different sections is quite different.The drainage depth of carbonate fissure water-bearing rock group is very small,and if the tunnel passes through this area,it will cause greater water inrush disaster.The longitudinal slope of the tunnel should be adjusted so that the tunnel floor is located above the Cambrian karst fissure water-rich layer.Through comprehensive analysis,the predicted value of maximum water inflow during tunnel construction is 15 788 m3/d,and the predicted value of normal water inflow is 4 163 m3/d.
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