Study On Stress And Deformation And Dynamic Response Of Concrete Face Rockfill Dam

Concrete face rockfill dams have the advantages of easy material acquisition,stable structure,fast and economic construction,and low requirements on engineering geological hard conditions,and have become the prospective dam type in the field of dam construction.The dam type is mainly composed of rockfill and panels.Among them,the rockfill is mainly used to bear weight and maintain structural stability,and the panels are mainly used as anti-seepage systems.The number of concrete faced rockfill dams currently built and proposed in China is huge.Analyzing its stress,strain,and stability,and studying the influence of stress and deformation,it is of great science to accurately grasp the stress and deformation characteristics and change laws of dams.Value and practical significance.The key points and results of this thesis research are as follows:This paper takes the actual engineering construction as the background,the concrete panel adopts the linear elastic model,and the rockfill uses the Duncan EB constitutive model and the Hardin-Drnevich.,VP model in the static and dynamic analysis,respectively.The slope of the dam is checked for stability,and the construction process of the dam body is simulated by the life and death element method.The numerical model is used to calculate the stress-deformation law of the dam during the three stages of completion,impoundment and second impoundment:the maximum settlement during the completion period is 1/2 the height of the dam,and the maximum upstream and downstream along the river is 1 / 4 dam height,the maximum axial displacement of the dam is symmetrical at 1/2 dam height on both sides of the middle,the maximum compressive stress at the bottom of the dam is 1.76 MPa,and the maximum tensile stress at the abutment is 0.3 MPa.After the first and second periods of water storage,the stress and deformation laws are the same as the completion period,but the locations where the maximum values occur are different.Based on the principle of advanced linear acceleration,a three-dimensional nonlinear dynamic analysis of the dam under an acceleration seismic load of 0.15 g is performed,and it is concluded that the absolute acceleration of the rockfill body gradually increases from the bottom to the top,with a maximum of 6.13.Themaximum displacement curves of the dam body in the longitudinal,transverse and sunning directions gradually increase from the bottom to the top.The maximum displacements in the transverse and vertical directions are 0.026 m and 0.032 m at the top of the dam,respectively.It is 0.055 m near the top of the dam.