Study On The Effect Of Water-rock Interaction On Stability Of Reservoir Bank

The deterioration of rock mass strength and the hydraulic effect caused by water-rock interaction have been well known as the two factors that could weaken the stability of reservoir bank. According to the schedule, after the Three Gorges Project is completed, the water level of the reservoir will be rapidly or slowly lowered and raised every year between 145m, the floods control level, and 175m, the power plant level. In this circumstance, the nature of the bank rock mass will be deteriorated inevitably by the "saturation-air drying" effect caused by water-rock interaction, and in which way the bank stability will be seriously damaged. As the time of completion of the Three Gorges Project is drawing near, to have the issue studied is becoming more urgent.This dissertation proceeds a systematical analysis and study on the influence of rock mass under "saturation-air drying" effect caused by water-rock interaction on the bank stability, with basis of indoor experiment, methods of experimental study, theoretical analysis and numerical analysis, and application of multi-disciplinary theories and achievements. The rules of rock mass deterioration caused by water-rock interaction and bank stability changes are discussed as well. The main conclusions can be drawn as follows:1. The influence of water-rock interaction on rock mass strength is prominent. According to the experiment, at the prophase of the water-rock circle interaction, rock was under a more serious damage effects both physically and chemically, in which the cohesive strength and internal friction angel were influenced best. The physical and chemical damage effects on rock were reduced as the actuation duration was prolonged and times were added. The influence on cohesive strength and internal friction angel was reduced as well and the changes become gentle.2. The breaking strength criterion of saturated fractured rock under fracture hydraulic pressure is deducted with the application of the fracture mechanics theory, on the basis of rules of rock mass deterioration caused by water-rock interaction generated by experiment. The criterion shows that the mechanical effects that caused by still water pressure (γ_WH) and dynamic water pressure (γ_WJ) directly impair the breaking strength of fractured rock, and they are in a linear correlation. The reduction of the mechanic strength parameters (c, φ) of the physical and chemical damage indirectly reduces the breaking strength of the fractured rock as well.3. The effects of the reservoir water level changes on bank stability are analyzed...