| Aiming at the main problem of seepage in RCCD, combining some project practices and literatures research, the author has made a particular analysis and research in the basis of the FEM theory. Main work are as follows:1.The analysis of the seepage characteristics and the experiments of both in laboratory and in site are showed here. The author has started the research with experiments of RCC samples from both in laboratory and in site. Through the study of the seepage characteristics, some sensible problems of RCCD have been found out. And knowing these problems has profound meaning.2. Based on finite element method (FEM), the author compiles the three-dimensional seepage field computation program of RCC dam. In the program, the RCC intervals anddrainage holes are simulated which are very important to the seepage field distribution, and the complicated process is put forward when drainage hole and exit surface intersect, andso on. So, the author could research and solve the RCC dams' seepage characteristics and seepage flow accurately and quantitatively.3. It is very important for the dam stability and safety to have the impervious and drainage structure of RCCD. Based on the impervious structure characteristic on the upstream and downstream and the layout of drainage structure, and the seepage property of RCCD, the impervious structures on the upstream and downstream are carried out in this paper.4. If the river valley is too wide and dam axis is too long, the transverse joints of RCCD must be preformed. If the sealing compounds are ripped, the quantity of seepage and uplift on the transverse joints will increase because of the relative strong perviousness on the bedding surface of RCCD.
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