Development Characteristics And Stability Analysis Of Landslide Induced By Toe Excavation

With the accelerated construction of mountain highways, a large number of artificial slopes formed, which often brings about landslide disasters. Now landslide induced by toe excavation has become one of the main landslide disasters in our country.Being an unloading process, slope toe excavation will have adverse effect on slope stability which is directly related to the safety, progress and budget of the construction. Therefore, it is necessary to do detailed researches on this landslide induced by slope toe excavation and determine its instability mechanism. Based on the survey of many landslide examples, study the developing characteristics and stability of the landslide induced by to excavation.Based on four examples of landslide induced by toe excavation, main reasons and development characteristics of this type of landslide are analyzed and concluded. Applied to Zhu Yong Highway 1# landslide, the potential sliding surface is determined with geological information, monitoring data and on-site inspections. To obtain the shear strength parameter which is unavailable through outside or inside experiments, the traditional limit equilibrium back-analysis method and FEM are used by reducting original slope. Combined with specific examples, put forward right calculating method to figure out dilatancy angle. On this basis, adopt finite element method of large elastic-plastic deformation and elastic-plastic FEM to simulate Zhu Yong Highway 1# landslide, analyze the effect on slope stability by toe excavation, reveal triggering factors and deformation mechanism and server for reference in practice to reduce same landslide disasters.