Abstract

Recently, interests in subsidence hazard have been increased due to the underground construction such as subway construction and managements of abandoned mines. GIS analysis of subsidence hazard has a lot of advantages in handling of spatial data and managing database. For better result of GIS analysis, there are some necessities of modifying previous subsidence theory and model. To take surface profile into account allows the application of complicated topology. Furthermore, for 3-dimensional analysis, two subsidence profile curves that are perpendicular to each other should be considered simultaneously. Through these modifications, the model for subsidence analysis using GIS can be established. With ideal case of cavities and other conditions, GIS analysis was accomplished and
meaningful results were produced. More realistic properties of cavity, soil layers, groundwater condition and topology will enable GIS analysis method to produce more reliable result and to widen the area of applications.

Keywords subsidence, GIS, topology, 3-dimensional profile, abandoned mine