| The main influencing factor of slope instability is rainfall,especially in soil slopes.Nowadays,China is in a stage of rapid development,and a large number of engineering construction will involve slope engineering problems,and landslides seriously threaten human life and property.Taking a soil slope in Huangping County,southeast of Guizhou Province as an example,numerical simulation was used to analyze the stability change law of slope with different rainfall intensity and duration.The results reveal the influence of different rainfall intensity on the overall stability of slope.The main work and research results are as follows:Through soil tests,it is concluded that the permeability coefficient of topsoil is 8.6 ×10-5m/s,the permeability coefficient of clay layer is 5.83×10-9m/s,and the good permeability of the upper layer of the slope accelerates rainwater infiltration,on the one hand,it increases the pore water pressure inside the slope,and at the same time increases the negative pore water pressure in most areas,which makes the soil uplift trend,and secondly,the increase of soil moisture content will lead to the reduction of soil cohesion and internal friction angle,which will reduce the shear strength of the soil and threaten the overall stability of the slope.To simulate the stability of the slope under different rainfall intensity and duration,the principle of fluid-structure interaction and intensity reduction method is adopted,and the dynamic coupling solution of rainfall on slope stability is realized by writing the Fish language.The results show that with rainwater infiltration,the pore water pressure gradually increases,the shear stress is mainly concentrated at the visco-heterogeneous interface,resulting in regional plastic strain and displacement,soil strength decreases,resulting in slope deformation instability,the maximum increase of plastic regional stress is 84 N,and the slope is in extreme equilibrium at 25mm/d(48h),50mm/d(39h),100mm/d(16h),150mm/d(8h),200mm/d(5h)in rainfall intensity and rainfall duration.The results show that with the increase of rainfall intensity,the values of slope saturation area and pore water pressure change little,but the concentration area changes significantly,the stability coefficient decreases rapidly,and the soil pore water pressure concentration area has a greater impact on the slope stability coefficient,and the pore water pressure distribution should be considered in the slope stability evaluation.This research also has certain reference value for practical engineering.The paper has 43 figures,15 tables,and 63 references. |
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