Analysis Of Coupling Effect Between Stress Field And Seepage Field In Mixed Dam

The mixed dam is a mixed type of concrete dam and earth dam.The concrete dam is an overflow dam section.The earth dam is water retaining dam section,The mixed dam has the advantage of making full use of terrain conditions and low project cost.However,the stiffness of concrete and earth dam are quite different,and the stress and seepage conditions are more complicated.The connection between the two dams is relatively weak,and the safety of the joint part is related to the whole situation and must be properly handled.The coupling analysis and calculation of seepage field and stress field are one of the important contents of geotechnical engineering research,and they are interconnected and interact with each other.The interaction between the seepage field and the stress field of the geomaterials reflects the coupling relationship between the two fields.It is also necessary to study and discuss the coupling problem between the seepage field and the stress field as a system.By introducing the examples of mixed dams at home and abroad,combined with the form and characteristics of mixed dams,the research and development of mixed dams are summarizedBased on the basic theory of seepage Darcy’s law,the basic theory of saturated seepage,the permeability coefficient of soil and the unsaturated permeability coefficient of the material are studied.The basic differential of the saturated-unsaturated seepage of the three-dimensional porous medium is deduced by the pressure head as unknown Equation and its finite element model.Combined with the Duncan ’s constitutive model of stress analysis of earth dam,the secondary development of ANSYS is carried out,and the finite element simulation of soil-rockfill dam is carried out.Taking the connecting dam section in the dam section of the outbound reservoir as an example,the three-dimensional finite element model of the connecting section is established.The modeling method and meshing method of the plug-in hybrid dam are introduced,and the nodes needed for stress and seepage calculation are extracted,Unit,set,constraints and other information.Finally,the results of stress and seepage are mutually iterated to achieve coupling,and the seepage and percolation gradient of seepage field under coupled coupling are considered.