Simulation Research On Dangerous Hydraulic Conditions's Influence On Dam Stability

Seepage risk is also obvious in dam-break risk except overtopping. More than 16 thousands reservoirs have seepage security issues, which accounted for 40% of the dangerous reservoirs. Due to seepage field's influence in overall stability of the dam, the size and direction of penetration on soil should be rightly considered in stability analysis of dam seepage. Local stability analysis of seepage should be focused on groundwater seepage gradient in penetration point. This paper studies risk hydraulic conditions's influence on seepage failure and stability.Gslope and Unsst2 software are adopted for the study of the dam seepage-stability related factors changing law. Not only to provide more accurate theoretical basis for dam seepage and stability analysis, but also to achieve some breakthrough in research on local stability and the overall stability of the dam under the influence of hydraulic factors. This paper mainly tests and simulates groundwater seepage, which is external load factor in risk hydraulic conditions. Simultaneously by means of experiment simulation, this thesis simulates engineering control measures, which can changes direction and size of groundwater flow.Due to NHRI seepage laboratory tank model, this paper real-time monitors and collects pore water pressure on the dam by DV camera and photoshop software. This paper draws contour map of seepage field by surfer software. This paper analysis slope stability by numerical simulation software, which can overcomes the bad combination between traditional vertical slice method and the results of seepage field.This paper includes:1)Verifying of test simulation and FEM calculation about dam seepage;2)Verifying of test simulation and FEM calculation about risk hydraulic conditions3)Researching on hydraulic conditions's influence on dam seepage and stability;4)Verifying of test simulation and FEM calculation about engineering measures improving seepage-stability;5) Optimal selection of unsaturated-saturated seepage theory and saturated seepage theory model.