关键词: 渗流场, 耦合, 土石坝, 非饱和固结, 非饱和土

Abstract: It is of great importance to carry out the coupling analysis on unsaturated unsteady seepage field and stress field for earth-rockfill dams. To evaluate dam safety, it is essential to perform stress and strain analysis which takes construction process and initial reservoir impoundment process into consideration. In operation, it is also necessary to implement soil-water coupled analysis considering periodical fluctuation of reservoir water level and rainfall within dam area. Based on an assumption for the earth-rockfill dam, the equivalent integral equations are derived for the unsteady flow field coupled with stress field. Finite element discretization in spatial domain and time domain is made and the corresponding computer program is developed with Fortran 90 to solve the coupling issues. By calculation on the consolidation for an unsaturated soil column as well as analysis on the deformation and stress for a homogeneous earth-rockfill dam considering the construction and initial reservoir impoundment process, conclusion is gotten that the proposed coupling analysis method for earth-rockfill dam is reasonable, correct and reliable. It can be applied to the coupling analysis of seepage field and stress field for an actual project.

Key words: seepage field, coupling, earth-rockfill dam, unsaturated consolidation, unsaturated soil