Analysis of local safety factor of soil slope considering water-air coupling
The traditional slope stability analysis method only evaluates the overall stability of the potential sliding surface,and cannot obtain the safety factor of each point.Based on the theory of local safety factor,the stability of the slope under rainfall conditions is analyzed comprehensively consider-ing the water-air coupling effect.The results show that the method of local safety factor can directly reflect the specific failure area of the slope under the water-air coupling.The pore gas pressure has a little anti-infiltration effect on the slope rainfall infiltration,and the anti-infiltration effect becomes more obvious with the passage of rainfall time.Under the same conditions,when the rainfall is 40 hours,the depth of the wet front of the two-phase flow is reduced by 28.6%compared with the unidi-rectional flow.Considering that the effect of water-air coupling will reduce the stability of slope,when the rainfall is 40 hours,the instability area of the two-phase flow slope is about 1.7 times that of the unidirectional flow under the same conditions.Therefore,the water-air coupling effect should be con-sidered when analyzing the slope stability in actual engineering,and the engineering tends to be safer.
local safety factorwetting frontwater-air couplingsoil slopestabilitydisaster preven-tion and control
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