Deformation and failure characteristics of high and steep slope and the impact of underground mining

摘要

The high and steep slope is seriously attenuated by goaf formed by mining of the transition layer at the bottom of open pit in transit to underground mining.Focused on the stability in the south slope and the main level tunnel underground in the Shouyun Mine stress, the stress and deformation are analyzed by using FLAC 3D numerical software.The results show that the failure mode of high and steep slope of an open pit transiting to underground mining differs from that of an ordinary open pit slope;a large deformation and sliding easily occur in slope as retreat mining near the foot of the pit.Large deformation and failure of high slope is proposed as the main failure mode of rock slope instability while an open pit transiting to underground mining.In order to achieve an efficient and safe mining of deep main ore, removal of upper slope and formation of an overburden cushion are proven a significant method from the open pit to underground mining.