Study On Stability Evaluation And Protective Measures Of Loess Slope On The South Tableland Of Jinghe River In Shanxi Province

There are many high and steep loess slopes in the south plateau of Jinghe River,Shanxi Province.Due to the combined influence of rain,freezing and thawing,earthquakes and man-made factors,it is prone to geological disasters such as landslides and collapses,which seriously affect road traffic and the safety of residents lives and property has been affected by landslides in recent years.Therefore,it is necessary to analyze the stability of the loess slopes in this area.This paper takes the loess slope of Niuyang Village,nanyuan,Shanxi Jinghe as the engineering background,adopts a combination of theoretical analysis and numerical simulation,and uses the finite element software to analyze the stability of the slope and study the protective measures.The research contents and results are as follows:(1)By analyzing the structure of loess slope and the influencing factors of loess slope instability,it is found that the deformation and failure types of loess slope in the south Jinghe tableland of Shaanxi generally include flake spalling,granular spalling and gully failure.Explore the factors that affect the stability of loess slopes and the external factors that cause geological hazards of loess slopes.Based on the failure type and deformation failure characteristics of the loess slope,the potential dangerous slip surface of the slope is assumed.The stability coefficient of the natural slope is calculated by the limit equilibrium method.The stability of the slope is analyzed,and the slope is in a basically stable state.(2)Based on the finite element software and taking the loess slope as the research object,the three working conditions of natural working condition,heavy rainfall working condition and earthquake working condition are simulated and analyzed respectively,through its safety factor and displacement,shear stress and plasticity deformation analysis shows that the slope under natural conditions is basically in a stable state,which is consistent with the analysis results obtained by theoretical calculations,indicating the reliability of the simulation results;the slope under heavy rainfall conditions and earthquake conditions is in an unstable state,so the unstable slope should be strengthened(3)Anti-slide piles and anchors are used to support the loess slope respectively.By comparing the changes of safety factor,displacement,shear stress and plastic deformation before and after reinforcement,the analysis shows that the anchor support reinforces the slope the effect is better,and it is more suitable for supporting the slope.After confirming the use of bolt support,this article optimizes the anchoring spacing of the bolts.The simulation contents are:? anchoring spacing is 2.0m;?anchoring spacing is 2.5m;?anchoring spacing is 3.0m;?anchoring spacing is 3.5m.By comparing the changes of displacement,shear stress and plastic deformation,it is concluded that when the anchor spacing is 3.0m,it can not only ensure the stability of the slope but also reduce the waste of materials.