Remote sensing investigation of Jincheng goaf and stability evaluation

Decades of underground mining around Jincheng city results in a large quantity of goaf.By virtue of remote sensing geology interpretation as well as investigation, and research on technical materials of multi-temporal satellite images, aerophotos, digital elevation models, the paper gives a fairly comprehensive grasp of goaf around Jincheng city.28sinks and 23crevices are determined in the goaf.According to various factors, such as goaf's age, roof lithology, the number of the exploited layers, and the status of ground sinks, the goaf is divided into three types: extremely instable area, instable area, and comparatively instable area.5extremely instable areas, 4instable areas and 13comparatively instable areas are determined.