Three Dimensional Finite Element Analysis For The Deformation Characteristics Of Concrete-Face Rock-Fill Dam

The concrete-faced rock-fill dam (CFRD) has become one of the most economical dam types. Since the type of dam was introduced into our country, it has been flourishing.Nowadays, CFRD has been taken as one choice of dam types in water conservancy and hydropower construction of our country.In recent years, as CFRD engineers build dams on the strong-earthquake high-cold area, deep alluvium and complex engineering geology foundation, the deformation, stress , peripheral seam, and water-seal structure of slab joint have been the main problem of CFRD security. How to reduce the face plate deformation as far as possible , make the face plate stress in the certain scope, choose and establish the water-seal form to coordinate the deformation are more and more concerned. Therefore, It has the important theory value and the practical significance to understand the working performance, ensure the dam body security as well as the design and the construction by analyzing the influencing factor leading to the deformation of the face plate and the building material and the displacement of peripheral seam, slab joint and the toe board.The article focus on the above questions, and the article is divided into two major parts.In the first part , the article firstly analyses finite element constitutive 3D model of the CFRD to chose the better constitutive relationship. The next to analyze stress and the deformation of CFRD to generalize basic principle , the influencing factor and the character of the slab joint. The last to establish 3D model of one hydroelectric power station on the Jiulong river, and stimulate the stress and deformation under the completion and impoundment. We can obtain that the dam is safe ,but the big tensile stress areas on the face plate has already surpassed the concrete fundamental stress under impoundment and we should take some measures to change the stress of the face plate and the big vertical joint of the dam both sides nearby the mountain. In the second part, we study the feasibility of changing the type of the concrete-faced rock-fill dam type from the linear patter to arch pattern .The main measure we adopt is to establish 3D model to calculate the stress and the deformations of the dam body, the face plate , vertical joint and peripheral seam, then analyze the result contrary to the linear pattern concrete-faced rock-fill dam. The result indicates that the arch concrete- faced rock-fill dam instead of linear pattern may reduce the tensile stress approaching to mountain both sides as well as the vertical joint based on the increasing the tensile stress insignificantly. Therefore, the arch concrete-faced rock-fill dam is more advantageous to the dam security.The research of the article laid a foundation for the security and construction of the hydroelectric power station project on the Jiulong river , and the result of adopting the arch concrete-faced rock-fill dam instead of linear pattern has the important theory value and the practical significance as well as reference taken by the similar projects.