Remote sensing analysis based on GIS for permissible route selection mined-out subsidence areas of an expressway

Coal mined-out section is the main harmful engineering geological problem and crucial restraint of western Beijing-Fuzhou Express Way around the city. In order to control the distribution and expansion for mining subsidence areas along the line, TM87, TM94 and ETM2000 remote sensing images are adopted as the information source to bring into play the rapidity, accuracy and strong periodicity of remote sensing technology, to retrieve the dynamic variation information of coal mining water-logged subsidence areas under the support of GIS, and to analyze the distribution and expansion condition of mining subsidence areas on this basis so as to provide reliable evidence for engineering geological assessment and route selection of this expressway. It is indicated by the analysis that remote sensing technology is easy to discover those geological phenomena which are hard for normal geological approaches to find out under severe environment. Its achievements are highly authentic especially suitable for route geological engineering condition assessment and route proposal comparison in probable and permissible stages of highway engineering, and for improving both economical efficiency and reasonability of route design proposals. In the meantime, it offers guidance to prevention of potential diseases occurring during the follow-up engineering construction and after completion of projects.