Mechanical Analysis of Goaf Processing and Residual Ore Recovery Planning

Abstract

In this paper, FLAC3D software is used to analyse the overall plan of goaf processing and residual ore recovery. Through the whole process simulation analysis of “underground goaf forming—key goaf filling—residual ore mining", the plan rationality is evaluated. Results show that: (1) Parts of goaf are in unstable state to some extent. (2) Key goaf pre-filled program is beneficial to improve pillar stress and maintain goaf stability. (3) No massive destruction is caused by pillaring. (4) Pillaring has an impact on the open pit slope stability.