The Research Of Coupled Seepage And Stress Fields In Earth-Rock Dam On Deep Overburden Layer

As a result of limits of exploitation condition factor and so on, more and more hydropower construction will be constructed inevitably on deep overburden layer ground.But to the earth-stone dam on the deep overburden layer,when is founded,it is very important to research distributing of seepage and stress field effectively and for estimating correctly stabilization of body and base of dam.The project practice shows that some reciprocity is existed between seepage and stress field in the earth of body and base of dam,but the nonlinear coupling of seepage and stress field could even adequately meet the research request.At present, more research stress to the coupling of seepage and the stress field of the fissured rock, less to the pore medium material non-linear coupling research.The seepage of earth-rock dam is calculated by thermal analysis module for ADINA based on the comparability of seepage field and temperature field. Quadratic development of E ? B Duncan-Chang model is realized and can simulate 3D finite element method stress and strain of earth-rock dam make use of facile exploitation platform ADINA Moreover combination setting of the element birth and death, time function and time step were used to simulate construction course of earth-rock dam compaction in layers and water impoundment by stage. Area-area contact element used to simulate contact between impervious wall and coverage layers. In the end, the paper research the coupling mechanism between earth-rock dam seepage and stress field , establish mathematical nonlinear coupling model for coupling analysis and can calculate double-field coupling on the large finite element software ADINA. Analyzed the change law of body and base of dam with coupling, through analyzed double-field coupling to the Jin-yuan homogeneous earth-rock dam, and simultaneity make the contrast research to the results of seepage and stress field of the dam's body and base with coupling or not. The conclusion shows that the result computed by double-field coupling is draw closer together to engineering reality.The model and method obtained in the paper present a lot in principle for the finit elementcalculation of seepage and stress-strain and for the research of coupling seepage and stress fields.The research results have very important value in reference.