In order to explore the stability evolution law

under water-rock interaction

of mudstone reservoir bank which has been located in Funing Port areas of Yunnan province

and then based on the rock samples

collected from the first-stage project field

the conventional triaxial compression tests were conducted with different numbers of drying and wetting cycles and the rock shear strength parameters were obtained. After engineering conversion of strength between rock and rock mass

it formulated the time-varying model of probability distribution of mudstone general shear strength parameters by regression analysis. Then combining with the limit equilibrium method and the reliability theory

the time-varying laws of mean safety factor

reliability and reliability safety factor were drawn. The results show that the reliability safety factor

coupling the safety factor and reliability

can analyze the time-variation of mudstone reservoir bank more reasonably

during the water level fluctuation repeatedly. Furthermore

it is nonlinearly that the characteristic of the whole stability of mudstone reservoir bank has changed. Besides

the failure model of the bank slope is gradual that the critical slip surface changes from inside to outside. The time-varying stability analysis methods of mudstone reservoir bank proposed by the paper based on the laboratory experiment can provide an effective approach for stability evolution rule of the reservoir bank

impacted on by the high water soaking and water level periodic fluctuation.