The rock mass in the hydro-fluctuation belt of the reservoir bank slope is subjected to long-term water-rock interaction and frequent moderate-low intensity reservoir earthquake. The deterioration of the mechanical properties of the rock mass caused by this directly affects the dynamic response and seismic capacity of the reservoir bank slope. Based on this

the settings of the fluctuating zone of the bank slope of the reservoir are simulated

and the water-rock interaction test to simulate the periodic rise and fall of the reservoir water level is designed and carried out. In the course of the test

the cyclic loading and unloading method is used to simulate the influence of seismic action

and the sequential action of water-rock interaction and cyclic loading and unloading is mainly considered. According to the test results

the following conclusions are obtained. (1) The dynamic parameters of the rock sample generally change exponentially from steep to gentle under the water-rock interaction. After considering the sequential action of water-rock interaction and cyclic loading and unloading

the deterioration rate and trend of dynamic parameters of rock samples increase obviously

indicating that frequent moderate-low intensity reservoir earthquakes can obviously promote the damage development of bank slope rock mass in the environment of water-rock interaction for a long time. (2) Under the action of water-rock interaction and cyclic loading and unloading

the microstructure of rock samples gradually loosens from the compacted state

and the corresponding integrity degradation coefficient and the secondary porosity also show a trend of steepness and then slowness. Among them

the microstructure changes of rock samples under the sequential action of periodic water-rock interaction and cyclic loading and unloading are the most significant

followed by the rock samples with initial cyclic loading and unloading damage

and the change of rock samples under the water-rock interaction alone is the smallest. The changes and differences of the microscopic structure of the rock sample under different schemes also govern the degradation law of its dynamic characteristics. (3) Under the long-term water-rock interaction and frequent moderate-low intensity reservoir earthquakes

the internal damage of the reservoir bank slope will gradually accumulate and develop

which will directly affect the dynamic response characteristics and seismic capacity of the reservoir bank slope. Therefore

the degradation law of the dynamic characteristics of the bank slope rock mass should be systematically considered in the analysis and evaluation of long-term seismic performance of reservoir bank slope.