A parameterized control Duncan Zhang E-B model calculation program module is developed using APDL language based on the large-scale finite element software ANSYS platform,and calculation process of the rockfill dam also is designed,the reliability of the program is verified by the numerical example.The three-dimensional linear and nonlinear finite element analysis on the foundation gallery of a core rockfill dam under construction are completed to op-timize the gallery section type and dimension.The research results show that secondary development of the Duncan Zhang E-B constitutive model on large-scale finite element software platforms is feasible and the material properties of the surrounding rock mass and soil have a significant impact on the stress state of the foundation gallery.The influence of different thicknesses of bottom lining on the stress of the gallery has compared.The results show that the characteris-tics of the surrounding rock mass and soil have a significant impact on the stress state of the corridor;as the thickness of the bottom plate increased,the maximum tensile stress value on the surface of the gallery bottom plate gradually de-creased,while the tensile stress on the inner side of the arch showed a trend of first decreasing and then increasing.Considering the deformation,stress,failure zone and economy of the gallery,it is recommended to use a city gate shaped cross-section with a bottom plate thickness of 1.8 m～2.0 m.This method has strong universality,easy opera-tion,and can provide reference for other similar engineering constructions.
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