Analysis on Stability of Concrete Arch Dam by Nonlinear Finite Element Method

From action features of concrete arch dam,it shows that stability of the concrete arch dam relies on rock mass on both abutments.Therefore,stability of the rock mass on abutment is directly related to the normal operation and safety of the arch dam.It is also one point focused specially in design of the arch dam.In combination of one project practice and based on ANSYS as platform,one concrete arch dam and whole topography are taken as the study object in this paper.Aiming at one model,stability of the dam structure is analyzed from different views by application of overloading coefficient method,strength reserve coefficient method and so on.From calculation and analysis by nonlinear finite element method,it shows that cracks develop along the dam foundation plane toward the dam height direction under action of different overloads.Simultaneously,cracks in the dam heel develop along the dam-thick direction and tend to be still finally.With increment of the strength reserve coefficient,safety factor of stability of the arch dam against sliding is decreased gradually.Basically,it develops in linear.Meanwhile,so is the dam displacement.But,the dam displacement obviously develops in linear when the critical safety factor of stability against sliding approaches.This provides calculation basis for fully learning the structural safety degree of the arch dam.