The galleries of high core wall rockfill dams on thick overburden layer is subjected to complicated loads，and its safety is the key to the project.In order to study the safety of galleries of this kind of dam,taking the Changheba dam as a background,and using the finite element analysis,the leakage from the destruction to the watertight seal was simulated.Based on the sub-model method,nonlinear elastic model was used for the gallery concrete.Cracking process and failure process of the gallery were conducted.Meanwhile the actual dam construction process and reservoir impounding process were considered.Through the analytical results the crack propagation,cracking direction and breakage feature were learned.Furthermore some reasonable suggestions were given,which can be used as reference to changheba project and similar project.
