Regional slope stability zonation based on the factor overlapping method

摘要

Regional slope stability is to study the possibility of slope deformation and instability from theview of regional scale. The paper took the Maerqu watershed from Makehe to Moba County in the upper reachesof Dadu River as the study area. Gradient,fault,slope type,elevation difference,earthquake intensity,lithology,rainfall and land use were chosen as the main factors to affect slope stability. These 8 factors were classified,quantified and scored firstly. Then the original maps of the 8 factors were overlapped by using the factoroverlapping method. Consequently,the regional slope stability of the study area was divided into three types ofregions: the stable region,the middle-stable region and the unstable region. The area of the unstable region is810 km2 which occupies 51.9% of the total study area. It is indicated that the possibility of slope deformationand instability of the study area is high.