Calculation And Analysis Of Plane Finite Element Stress And Strain Of Earth-rock Dam Of Daishihe Reservoir

In this paper,the Dashitou Rivercore earth-rock dam with asphaltic core-wall is selected to be studied.The author use the Duncan-Chang B-E model as the present stress-strain analysis model,and the software AUTOBANK is used in the completion and storage periods respectively.The horizontal displacement,vertical displacement,large principal stress,secondary principal stress analysis has been studied.Through calculation and analysis,we can draw the following conclusions:(1)Dam displacementCompletion period: the dam body under the action of the weight,the dam body displacement asphalt concrete core wall as the dividing line,would be destroyed towards the upper and downstream respectively.Storage period: under the action of water pressure,the horizontal displacement decreases to the upper deformation area is reducing.,and the downstream deformation area is increasing.(2)Dam stressDuring the completion and storage period,the main principal stress σ1 and secondary principal stress σ3 are gradually reduced from the core wall to the dam foundation,and gradually increased from the dam slope to the dam foundation.During the completion period.The main principal stress σ1 and the secondary principal stressσ3 of the upper are all reduced after storage;the major principal stress σ1 of the downstream dam is slightly increased,and the secondary principal stress σ3 is slightly reduced.(3)Displacement of the asphaltic core-wall and Stress of the asphaltic core-wallDuring the completion and storage period,calculated displacement of the asphaltic core-wall and stress of the asphaltic core-wall.Through the analysis,we can see that the selected three sets of parameters can meet the design requirements,and in the first set of model parameters,the model analysis and calculation results are better.The stress and deformation of the dam body can meet the design requirements in the proposed dam partition and material parameters.