Analysis And Prediction Of Rock Slope Stability Influenced By Flood Releasing Atomization

Due to steady rock slopes providing a basic guarantee to safety of the main hydraulic engineering, it has a definite realistic meaning to study stability of fractured rock slope under flood discharging. In the paper, slope and protective structure in energy dissipation and atomization have been taken as research objects and spray rain and highly intensity hydraulic pressure produced by flood discharging have been taken as research influence factor. Some series of critical problems such as atomization diffusion range, saturated-unsaturated seepage field in fractured rock slope and stability of rock slope under the influence of spray rain infiltration, stability of protective structure under fluctuating water pressure, destabilization forecast for slope, have been studied.Overflow is main way of energy dissipation. Considered terrain condition, a mathematical model of droplet random splash was proposed, and the corresponding differential equation was set up and worked out by Runge-Kutta and Monte-Carlo method. Meanwhile, the rainfall intensity was determined. The differential equation of spray diffusion under random condition was studied and the expressions of spray density and rainfall intensity were derived from the two-dimension steady flow diffusion equation. At last, the prediction of atomization influent scope for Laxiwa Hydropower Station was made by OFAMM, through which the storm and drizzle intensity and their influence scope were determined separately.Spray rain is produced when the structure discharges flood. It possesses characteristics such as highly intensity, time focus and so on. Aimed at fractured rock slope, which can be equivalent to continuum, a finite element mathematical model for saturated-unsaturated seepage flow in fractured rock slope under spray rain is set up based on unsaturated seepage theory. Different from previous, the model deals with infiltration border by making absolute value of current flow as the max. Program UNSAT used to calculate saturated-unsaturated seepage flow in three-dimensional fractured rock slope is worked out. An example about spray rain infiltration is analyzed. The results show that pore water pressure of unsaturated area rise quickly where exist highly intensity of spray rain and transient additive water load and saturated area are easily formed.