Abstract: Exploitation of hanging wall ore with filling method can not only recycle ore, but also avoid decline of the slope and control deformation of surrounding rock effectively. Based on the hanging wall ore mining by filling method of Daye Iron Mine, Cavity Monitoring System (CMS) is used in this paper to detect the original goaf of hanging wall ore. Then stress, displacement and plastic deformation of surrounding rock and open-pit slope in the processing of mining the hanging wall ore are analyzed by CMS and 3D mine-FLAC3D coupled method. The calculation results show that the surrounding rock and open-pit slope deformation can be controlled by filling the goaf effectively, so that the hanging wall ore can be mined safely. In the process of mining the hanging wall ore, monitoring network containing stress, fractures convergence and total station is established to monitor real-timely the displacement and stress changes of the surrounding rock, the pillar and the slope. The monitoring results are generally in agreement with the numerical simulation.

Key words: hanging wall ore, high steep slope, CMS, numerical simulation, monitoring