Study On Internal Stress Of Rockfill Dam With United Seepage Control With Geomembrane And Soil

Earth dam developed at top speed during the past several decades, showed that itis a type of dam which has competitive power.Hydraulic permeability, leakage, stability and thickness studies of imperviousgeomembranes in embankment have been done according as test data supports,qualitative understandings or quasi-quantitative formulas while studies of thegeomembranous structural problems(such as defect damages, stress damages andcombined permeability, etc)are still in incipient stages. The impervious problem andarch effect in clay core are the problems which can't be fenced with all the timesduring the developing process of high earth dams. They also cause the developingstagnation of high earth dams to some extent.This article bases on the fact that combined impervious systems can display itsimpervious character very well, studies from geomembranous structures withintegrates case, and uses FLAC^3D a finite difference software to do numericalsimulations of stress in the dam whether there is a geomembranes and fine out thedifferences of stress in the geomembranes according to the different anchoring way ofadding geomenbranes. The primary coverage of the simulations is as follows.Firstly, take the three-dimensional model of Pubugou project as an example,uses FLAC^3D to analyses the mechanics of the impervious system with the clay coreand geomembrane, analyses the structural stresses of dam face geomembranes.Compare three different stress states as follow:1,without hard clay soil at the bottom of the dam2,with hard clay soil at the bottom of the dam3,without hard clay soil at the bottom of the dam but there is geomenbranes infront of the core wallComparing and analyzing the stress level we can know that the geomembranesnot only have active effect on impervious problem instead of hard clay soil but also improve the stress in the dam such as arch effect. And then it can reduce the danger ofhydraulic crack. So it is unnecessary to set up hard clay soil at the bottom of the dam.Secondly, mostly studies the cramp effect at anchorage zones and whetherdifferent anchoring ways that can influence the cramp effect. As a result, the articlegets that wrapping anchoring ways can eliminate the cramp effect evidently.