Abstract:The Chimashan copper deposit, located on the south bank of the Yangtze River in the southeast of Hubei Province, has been closed due to resource depletion. In recent years, there have been serious geological disasters such as gob collapse, mountain crack and dangerous rock mass in the Chimashan copper deposit. Based on this, this work used UAV tilt photogrammetry technology and three-dimensional realistic image modeling, combined with the survey and mapping of in-situ goaf subsidence area, engineering geological survey and other methods to study a series of secondary geological disasters caused by goaf subsidence in the Chimashan copper deposit, Hubei Province. This study also identified their status and distribution patterns, and discussed the coupling relationship between subsidence area, mountain crack, dangerous rock, and goaf. The results show that the ground subsidence is composed of four subsidence pits: 1 #, 2 #, 3 #, and 4 #, with a strike of 114°~127°. The mountain cracks are distributed parallel to the long axis of collapse, with a width of 0.2~3.0 m. The formation of subsidence areas, mountain crack, and dangerous rock is mainly caused by the use of collapse top and bottom pillars and interlayer pillars to treat the goaf. In addition, the prediction modeling and prediction evaluation of mining geological environment were carried out, and reasonable safety measures and governance suggestions for goaf subsidence area were put forward to provide a reliable basis for ecological environment restoration in mining areas.
