Research On High Slope Stability Of Dawang Deep Pit Ice World

Dawang Deep Pit Ice World is a part of Changsha Dawang Mountain Tourism Resort Center. It was designed as an elliptoid flying saucer which is 300 meters long and 200 meters wide. The construction site was a stone pit belonging to Xinsheng cement plant, but now it is just an abandoned pit. The average height of its walls is 100 meters while the highest area is up to 110 meters, basically staying stable status. According to the final design of Dawang Deep Pit Ice World, a arch structure will support the main building and deliver heavy load on the walls by concrete bearings. Stability analysis on such high and steep slopes (walls), bearing such heavy slanting load, is not only valuable to site operation but also a valuable research.In this dissertation, slope stability analysis methods, slope failure modes and former studies about temperature influence on slope stability have been summarized, in addition, the cases about abandoned pit redevelopment have been involved. Study on high slope stability of Dawang Deep Pit came up with 3 main achievements.1. Based on geological prospective and comprehensive analysis of data, this article detailed pit’s geographic and geomorphic conditions, geological structure, formation lithology, hydrogeological conditions and geological engineering conditions. The design of concrete bearings was used to divide the slope (wall) into three areas. Applying stereographic projection on each area, the evaluation, involving engineering geological conditions and rock quality, was concluded to give some engineering suggestions.2. After geological analysis, FLAC 3D numerical simulation software was employed to research the stability of particular area. This dissertation analyzed the slope in 2 working conditions (unreinforced and reinforced) and then predicted the distribution of stress and strain, furthermore, slope’s resistance forces and safety factors was calculated.3. In addition, using COMSOL, which is another numerical analysis software, study the large temperature difference (between outdoor burning hot and indoor ice world) by which the slope stability is influenced. Following the temperature distribution field had been simulated, the distribution of stress and strain within the slope was concluded.