Abstract
A new mining scheme by employing the induced caving mining method to exploit hanging-wall ore-body during the transition from open pit to underground mining is proposed. The basic idea is to use the mined-out area generated by the planned mining of the hanging-wall ore-body to absorb the collapsed slope body, so as to avoid the influence of the inner-slope mining to the normal open-pit mining and guarantee mining efficiency during the transition stage. Numerical simulation study on the process of induced caving mining of hanging-wall ore-body is carried out based on the practical engineering setting of the Hainan iron mine, China, by employing the numerical method of discontinuous deformation analysis (DDA). The impact of rock mass structure on the mechanism of slope instability development and the mining hazard assessment in the new mining scheme is investigated. The influence of mining sequence on slope instability development and mining safety is also analyzed by taking the hanging-wall ore-body mining under the southern anti-dip slope at the Hainan iron mine as an example, and eventually a reliable mining scheme via induced caving is obtained. The numerical study proves the feasibility of the proposed new mining scheme for hanging-wall ore-body and provides theoretical and technical support for its application in practical mining activities.
Highlights
A new mining scheme by employing the induced caving mining method to exploit hanging-wall ore-body during the transition from open pit to underground mining is proposed. e basic idea is to use the mined-out area generated by the planned mining of the hanging-wall ore-body to absorb the collapsed slope body, so as to avoid the influence of the inner-slope mining to the normal open-pit mining and guarantee mining efficiency during the transition stage
A mining scheme for hanging-wall ore-body via the induced caving mining method during the transition from open pit to underground mining is proposed. e numerical simulation in this study proves the feasibility of the proposed mining scheme and explored its mechanism and some critical impacting factors including the rock structure and the mining sequence
E numerical simulation results show that the mode of slope instability triggered by the induced caving mining of the hanging-wall ore-body is closely correlated with the rock mass joint orientations of the slope
Summary
Bottom recovery subarea e ore-body is partitioned vertically downwards into three subareas with di erent mining characteristics, called the induced caving subarea, the sublevel caving subarea, and the bottom recovery subarea, respectively. According to the joint set orientations and some literatures of slope instability studies [21, 22], due to the mining of the hanging-wall ore-bodies via induced caving, the north slope may take place sliding failure, whereas the south slope may take place topping failure. In the two sections, DDA simulation study on induced caving mining of the hanging-wall ore-bodies will be conducted, and two major factors, namely, the rock structure and the mining sequence will be considered
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