Static And Dynamic Analysis Of Impervious Structure System Of Suki Kinari Dam

Water conservancy projects plays a very important role in the national economy.Due to the limitation of geographical conditions,some asphalt concrete core dams have to be built on the foundation with unfavorable geological conditions such as deep overburden in some large fault zone,deep valley and high and steep slope.The stress and deformation state of asphalt concrete core dam constructed under complex geological conditions will be more complex,so the static and dynamic research of asphalt concrete core dam under complex geological conditions is particularly important.In this paper,the asphalt concrete core dam of Suki kinari hydropower station in Pakistan,which is built on the deep overburden foundation,is taken as the research object.The threedimensional finite element model of Suki kinari asphalt concrete core dam built on the deep overburden is established by using ABAQUS nonlinear finite element software,and the static and dynamic analysis of Suki Kinari asphalt concrete core dam and super deep plastic concrete cut-off wall in deep overburden layer is also carried out.The main research contents and achievements of this paper include the following aspects.(1)Based on Python language,the Duncan Chang model parameter input interface is redeveloped in ABAQUS finite element software.The Duncan Chang model input interface is added in ABAQUS software and applied to static analysis.(2)The 3D geometric model of Suki Kinari asphalt concrete core dam is established by using ABAQUS finite element software.The geometric model is imported into Hyper Mesh software for mesh generation,and the construction filling sequence of the dam body is reflected.Then the processed mesh model file is imported into ABAQUS software for static and dynamic calculation.(3)Duncan Chang - model is used to analyze the static characteristics of Suki Kinari asphalt concrete core dam by three-dimensional nonlinear finite element method.The calculation results show that the maximum displacement is distributed at about 1/3 elevation of the dam body,and the displacement distribution along the river of the dam body and cutoff wall changes greatly under the influence of reservoir water pressure;the major principal stress of the dam body and core wall is mainly distributed in the dam body and core At the bottom of the cut-off wall,its extreme value is small,so the dam body and the core wall will not be damaged;the maximum tensile stress of the cut-off wall is distributed in the local minimum area where the cut-off wall intersects with the left and right banks,but it may cause the local area of the cut-off wall to be damaged.Through calculation and comparison,it is found that increasing the density of the overburden,improving the mix proportion of concrete and reducing the elastic modulus can effectively reduce the tensile stress of cut-off wall.(4)The equivalent linear model is used to analyze the dynamic characteristics of Suki Kinari asphalt concrete core dam with three-dimensional nonlinear finite element method.The calculation results show that the acceleration along the river of the dam body and the core wall is the largest,and both of them appear at the top of the structure.There is an obvious "whipping effect" at the top of the dam.The results show that the acceleration response in three directions of the cut-off wall is small when the beam is large;the dynamic displacement response in the vertical direction and along the river direction of the dam body is the largest;the dynamic principal stress and the dynamic shear stress in all directions of the dam body and the core wall are small,which will not cause damage to the dam body and the core wall.The maximum dynamic principal tensile stress appears in the cut-off wall about 2/3 of the depth below the right bank,and the maximum dynamic principal tensile stress occurs at the connection between the cut-off wall and the left and right banks.The dynamic stress response of the upper part and the lower part of the right bank is large,but the structure of the cutoff wall will not be damaged.