Abstract
In the mining industry, with numerical simulation analysis of stope roof stability, stope exposed area computation, and pillar buckling collapse simulation, backfill body creep damage mechanism research is becoming the most popular method in the field of backfill mining techniques. In this paper, we first summarized and analyzed the current application status and the existing problems of numerical simulation for solving mining engineering technical problems; then, based on the practical engineering problems of mining phosphate rock resources under high and steep rock slopes (HSRS), we carried out a true-3D numerical simulation study for different underground mining methods, to determine the appropriate mining method. Therefore, this paper, taking Dingxi Mine in China as an example, highlights the advantages of the backfill mining method with a high and steep slope; meanwhile, it also points out how to improve the accuracy of a numerical simulation and make it more consistent with the actual situation of the mining engineering application site. This paper only serves as a guide, in order to start a conversation, and we hope many more experts and scholars will become interested and engaged in this field of research.
Highlights
With the soaring demand for mineral resources, ore bodies that are easy to mine or with good deposit conditions are gradually becoming exhausted [1,2], while ore bodies with poor mining and deposit conditions, are gradually starting to be mined. Some of these ore bodies are located under high and steep rock slopes (HSRS), and mining operations and production in these areas might reduce the stability of the slopes and cause collapses that could threaten the safety of nearby residents
Tothe verify the feasibility of safe mining, the stability and reliability of a 2Dwere section were studied for a typical the and results that thethat stability and safety previously studied for aHSRS, typicaland
4tha part of the roof has formed failure units, which has the risk of partial roof collapse steps, a part of the roof has formed failure units, which has the risk of partial roof (Figure 14d,e)
Summary
With the soaring demand for mineral resources, ore bodies that are easy to mine or with good deposit conditions are gradually becoming exhausted [1,2], while ore bodies with poor mining and deposit conditions, are gradually starting to be mined. There are some problems in directly referring to these simulation methods to research mining under HSRS: (1) there is no dynamic mining process, usually only a simulation of a certain limited state of slopes; (2) some models are too simplistic, such as being simplified into a 2D model or pseudo-3D model (obtained by stretching a 2D profile). These simplified treatments cannot fully characterize the actual shape of the slope and the impact of mining activities, which may lead to a large difference between the simulation results and the actual situation. This paper, taking Dingxi Mine as an example, highlights the advantages of the backfill mining method, by comparing the advantages and disadvantages of various mining methods for a high and steep slope
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