INFLUENCE FACTORS AND CHARACTERISTICS OF APPARENT FRICTION COEFFICIENT OF LANDSLIDE BASED ON STATISTICAL ANALYSIS AND NUMERICAL SIMULATION

The apparent friction coefficient(or the test factor in this paper),is expressed as the ratio(H/L) of the maximum vertical height(H)to the maximum horizontal landslide displacement(L). It is an important and straightforward variable for characterizing landslide mobility. The authors statistically analyze the distribution characteristics of influencing factors(landslide volume V,slope angle θ,maximum vertical movement distance of landslide H) and the test factor(H/L)in landslides in southeastern Tibet and landslides triggered by earthquakes. The authors further analyze the influence characteristics of each influencing factor on this test factor,and simulate the temporal and spatial evolution process of the landslide movement using a numerical simulation method based on the continuum mechanics method. The results indicate that θ is a significant influencing factor of the H/L and mainly concentrated in 20°~40°. The H/L value shows a decreasing trend with the decrease of θ and H as well as the increase of V. The H/L value of the southeast Tibet landslide is generally greater than that of seismic landslide. Seismic landslides have significant remote characteristics,and seismic action can weaken the correlation between θ,V,H and H/L. The movement speed of the landslide near the foot of the slope often reaches its peak,and the foot of the slope has a significant blocking effect on the movement of the landslide. The research results have reference significance for the study of landslide movement characteristics and disaster prevention and mitigation.