Investigate probability of damage of Earth dam under Near-field and Far –field earthquake : Case study Gotvand earth dam

The main goal of preset research is investigate the effects of vertical component of Near-Fault and Far-Field earthquake records on the probability of overtopping induced damage of earth dam due to the reduction of freeboard due to the settlement of dam crest. In this respect 12 different earthquake record are selected. Nonlinear dynamic analysis of earth dam is implemented with FLAC 3D using Finn model that relates the increment of volume decrease per cycle of shear strain to the cyclic shear strain amplitude for considering the pore pressure build-up during seismic loading. Obtained results show that the response of dam for near-fault earthquakes considerably is larger than far-field records. Applying vertical component of earthquakes in the dynamic analysis caused the horizontal maximum displacement of damchr(chr('39')39chr('39'))s crest increase 5.58% for near-fault records and 2.96 % for far-field records and also maximum settlement for damchr(chr('39')39chr('39'))s crest increase 31.69 % for near-fault records and 73.65 % for far-field records with including vertical component of records in the dynamic analysis, Also can be get form obtained results the damage probability of dam with considering vertical component of earthquakes is increase 249% for near-fault records and increase 2419% for far-field records.