| dc.description.abstract | Frequent crustal movements and subtropical climate lead to the high sliding potential of many slopes in Taiwan, area slope stability analysis offers valuable design data to urban planning and large scale engineering projects. This study aims to analyze the factors that will contribute to sliding potential respectively, and an integrated evaluation is proposed for Takeng, Taichung. Factors with different grading and weighting are quantified statistically, GIS is used to process large spatial data, and a practical and efficient method in evaluating area slope stability is presented.
Factors contributing sliding potential are extracted from topographic maps, geologic maps, and all the available sources. Field geological investigation and Schmidt hammer impact tests are conducted as an assistance. Grading and weighting of the factors are quantified by inverse analysis, all the data are then proceed to a further integrated calculation to obtain the landslide susceptibility map of the area. The basic concept in the analysis is to set each grid point as (x,y,z) where x and y are the coordinates, z is the evaluating grade of a certain factor. By integrating all the effects from other factors, a new z-value representing its sliding potential grade will thus be obtained.
Study results show that the sliding in the middle and west parts of the area is mainly affected by fault structure, that in the northeast part is highly related to rock properties, while sliding in central and east parts is the results of strong weathering and erosion. Rock strengths in the area are evaluated from Schmidt hammer rebound values, high rock strength distribution lies in the locations with topographic highs. The result show that the high topography can be reflected as high rock induration. | en_US |