The Study On Stress And Deformation Properties Of Hekoucun Conerete Faced Rockfill Dam

As one of the main earth-rockfill dam’s types, Conerete Faced Rockfill Dam(CFRD) has been widely promoted and applicated at home and abroad. The accurate analysis of stress and deformation properties of CFRD is directly related to the security and stability of the dam body. Hekoucun CFRD, which is 122.5 m high and built on more than 40 metres deep overburden layer, is currently one of the highest CFRDs constructed on deep overburden layer in domestic. The geological condition of its overburden layer is very complex, and the overburden layer contains multilayer clay soil interlayers and sand lens. So it’s very important to know the dam’s stress and deformation properties accurately, which can be accomplished by the analysis of three-dimensional numerical simulation, and it also has great practical significance to study the change law of the dam’s stress and deformation properties. In this paper, main work and achievements are as follows:(1).The basic principle of finite difference numerical simulation of CFRD has been studied, and on the basis of Hekoucun CFRD, the processes of three-dimensional geological modeling, practical filling, water storage, loading stages and so on have been simulated.(2).The analysis of three dimensional stress and deformation properties of Hekoucun CFRD has been calculated, and it is divided into construction period and impoundment period. The results of Hekoucun dam’s stress and deformation properties are in line with the general stress deformation law of CFRD, and the detail results are as follows;(3).The influence of the indeterminacy of material parameters on stress and deformation properties of Hekoucun CFRD has been conducted by discuss the sensitivity of the Duncan E- B model parameters K and Kb. The results show that parameters K, Kb have a relatively greater influence on dam settlement, and little influence on dam stress and face deflection.(4).The influence of the filling sequence on stress and deformation properties of Hekoucun CFRD has been conducted. The result shows that the influence is remarkable, and the uniform rolling up way of dam whole section does good to avoid too big uneven stress and deformation.