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Numerical Analysis on Stability of Slope under the Condition of Rainfall
Pages: 76-78
Year: Issue:  11
Journal: Yellow River

Keyword:  rainfallloess slopestabilitynumerical analysis;
Abstract: Rainfall is an important factor influencing slope stability,rain infiltration makes the soil saturation increase and increase of soil moisture and the decrease of shear strength when the rainfall intensity and duration exceed a certain degree,leading to slope instability. Combining with the landslide of Lanzhou Forest of Steles treatment engineering,according to rainfall intensity and duration of that of the shallow stratum of the slope was obtained water content changes,using the unsaturated soil shear strength theory,combined with finite element the shear strength reduction of rain-fall,under the conditions of the loess slope stability was analyzed and the slope instability was forecasted. The results show that a)under the condi-tions of continuous rain,slope deformation and destruction are the main body of increased water content of the slope;b)as the water content to be the main control parameters of the shear strength,set up the slope soil total cohesion,internal friction angle and sustained rainfall time relationship, with the finite element analysis,get the time of slope destruction,can get for continuous rainfall condition of soil slope reinforcement protection and instability forecast to provide the reference;c)the safety coefficient got by traditional FEM strength reduction method in slope stability analysis can-not get exactly the effects of the stability of the slope strength and it can only explain whether the slope is damaged.
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