期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 43, 期 1, 页码 21-39出版社
SPRINGER WIEN
DOI: 10.1007/s00603-009-0035-3
关键词
Block caving; Open pit-block cave mining interaction; Slope stability; Numerical modeling; FEM/DEM; DFN
资金
- Rio Tinto
- Natural Sciences and Engineering Research Council of Canada
This paper addresses one of the most challenging problems in mining rock engineering-the interaction between block cave mining and a large overlying open pit. The finite element modeling/discrete element modeling (FEM/DEM) approach was utilized in the analysis of block caving-induced step-path failure development in a large open pit slope. The analysis indicated that there is a threshold percentage of critical intact rock bridges along a step-path failure plane that may ensure the stability of an open pit throughout caving operations. Transition from open pit to underground mining at Palabora mine presents an important example of a pit wall instability triggered by caving. Using combined FEM/DEM-DFN (discrete fracture network) modeling, it was possible to investigate the formation of a basal failure surface within an open pit slope as a direct result of cave mining. The modeling of Palabora highlighted the importance of rock mass tensile strength and its influence on caving-induced slope response.
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