Stability Analysis And Treatment Scheme Optimization Of Erzhuangke Landslide Of Yan'an

The special geographical environment and geotechnical conditions have caused the development of geological hazards in Yan'an region.with the rapid development of economy,the infrastructure construction has also been developed quickly in this region.Because of the constraints of land resources,it is unavoidable to cause certain disturbances to the mountains and induce more and more geological disasters during the infrastructure construction.Among them,landslides cannot be overlooked because of their fast destruction rate,large scale,and heavy losses,which severely restrict the building of economic infrastructure.It is quite significant to infrastructure construction that the stability of engineering slopes are evaluated accurately and the control measures are selected..This paper selects the No.2 landslide of Erzhuangke and determines its stability in combination with the geological structure and development characteristics.In order to ensure the safety of the planned construction of the slope foot and it is economically reasonable and technically feasible,the prevention and control plan is optimized.The specific contents include:(1)The on-site investigation has been made and the historical slip of No.2 landslide of Erzhuangke and information about the human engineering activities is collected.Drilling,geotechnical tests,and other survey methods are used to determine the stratum and geotechnical conditions of the landslide,which lays foundation for landslide stability.(2)By systematically analyzing the basic conditions of landslide at the present stage,No.2 landslide in Erzhuangke was determined basically stable.The landslide was quantitatively analyzed by the combination of the limit equilibrium method and the numerical analysis,and it could be known that the landslide was in a stable state under natural conditions;However,due to rain infiltration during rainstorm conditions,stress concentration and aggravation occur at the trailing edge of the sliding body,causing the landslide to be in an unstable state.(3)According to the actual situation and the results of landslide stability analysis,three different excavation volume of landslide treatment schemes were designed in combination with the proposed project of landslide slope.Three different excavation volume plans were optimized by using the level-fuzzy comprehensive evaluation method and grey relational analysis method.According to the results of two methods,the first option: anti-slide pile project + Slope trimming + drainage project + monitoring project is the excellent program.