LAUSR

In this paper, the stabilities of the Baihetan arch dam were analyzed by combining a geomechanical model test and the 3D nonlinear finite element method (FEM) based on the comprehensive method. The deformation characteristics and failure patterns of the dam, abutments, and foundations under different overload conditions were modeled and analyzed by the geomechanical model test. Then, the 3D nonlinear finite element calculation was conducted for complement and verification, by which the deformation characteristics and plastic failure zones of the dam and foundation under different overload stages were simulated. Based on the deformation behaviors, failure pattern, and the development of plastic zones of weak structure planes and rock mass in the dam’s abutments and foundation, the impacts of weak structure planes on the safety coefficient of dam abutment and foundation were analyzed. The geomechanical test results and FEM results demonstrated consistency in this study and provided an important basis for engineering safety assessment. The results indicated that the Baihetan arch dam meets the principal stability requirements; however, considering the large deformation and serious cracks in the middle-upper part of the left dam abutment, reinforcement treatment is proposed to improve the abutment stability of the Baihetan arch dam.