Seepage Problemsanalysis Of Gelantan Hydropower Station6#Dam Section Based On Finite Element Method

The rapid development of the water conservancy project, especially large andmedium-sized hydropower station, for concrete gravity dam in addition to considergeneral issues of foundation deformation and stability etc., also need to consider theeffects of fluid seepage.The author of this paper analyze seepage field distribution on the basic theory ofseepage and seepage finite element method to calculate theory as the foundation,based on ANSYS software heat treatment module. Combined with field monitoringdata inversion analysis of the permeability coefficient of soil, under the condition ofreality by comparing the curtain depth change and the influence of the change offoundation seepage curtain form, put forward to solve the seepage problems ofGeLantan hydropower station6#dam section. The analysis has an important guidingsignificance to the similar engineering problems and economic benefits.This articlemain research content:(1) Combined with field monitoring data, using the ANSYS heat treatmentmodule,on the status quo conditions, by assuming a series of foundation seepagecoefficient value, get a series of corresponding seepage quantity.The relationshipbetween permeability coefficient and seepage flow curve is obtained.Compared withfield monitoring seepage quantity,the inversion analysis of composite foundationunder the circumstance of permeability coefficient, the coefficient of permeability isafter many years of running the real permeability coefficient of the dam section.(2) Analyze the foundation has no curtain or have influencing dam seepagecurtain.When dam set anti-seepage curtain form status quo no change, which took the0m~90m depth change, analyze the change of the depth of the impervious curtaineffect on dam seepage field;Change the curtain form (maximum depth of the curtainsand minimum depth at the same elevation), which took the0m~90m depth change,analysis of anti-seepage curtain form changes and the depth of its influence on damseepage field.While the condition of the seepage effect is consistent, changing thecurtain form (maximum depth of the curtains and minimum depth at the sameelevation) will be less than the status quo curtain form curtain volume. Choose lowtemperature season for curtain grouting, grouting as the original under the dam foundation grouting depth less than40m place for irrigation to40m method forseepage control.(3) Analyze the foundation has no curtain or have influencing dam foundationuplift pressure head distribution.In the process of analysis of dam foundation upliftpressure fully into account the action of the dam for drainage. After curtain grouting,the dam foundation uplift pressure value greatly decreases, and reduce the value ofabout30%.The curtain in the form of a change of dam foundation uplift pressure headvalue less affected.