The major engineering geological problems of Kunming urban underground space development and utilization

Based on the outlines of urban underground space development status and trend in China, Comprehensive geological characteristics of the urban environment in Kunming are reviewed in this paper. Urban development restricted with Kunming basin has complexity on geological conditions and multiple geological disasters, especially, abnormity soft-soils in large-scale-subsidence basin. Therefore the characteristics of development and spatial distribution of soft soil in Kunming City are introduced. Finally, eight areas of engineering geological problems are analyzed and discussed in the underground space development, including the region of Ring Road, West Ring Road to Hunrui Road, East Ring Road to Eastern Basin, between North Ring Road and North Second Ring Road, East Side between North Ring Road and North Second Ring Road, the region of East of South Ring Road, North of Liujia highway, along the north shore of Dianchi Lake and Expo Park area.