Research on Influence of Loose Coverage Rock Fragment Distribution

Abstract:

The sublevel caving mining method is widely applied in China's underground mines, in particular of iron mines. Its mining work is under the protection of loose coverage rock. The loose coverage rock is located in the stope for a long time, and its frequently squeezed from production blasting, impact effect and the colliding and breaking in the falling process, it comes into being a large number of powder and small pieces of rocks. The rock powder and small fragments have such characteristics-good mobility and strong permeability. With the increasement of mining depth, the rock powder and small fragments in the loose coverage rock will be earlier to reach the ores than the big fragments of the same level. As a result, ore dilution will prematurely appear. To better know the phenomenon, this paper explores ore dilution of different fragment distribution of loose coverage rock by physical simulation experimental method. The research results have certain guiding significance for the actual production of underground mines.

• Periodical: Applied Mechanics and Materials (Volumes 405-408)
• Pages: 322-325
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.405-408.322
• Online since: September 2013
• Authors: Guo Jian Zhang, De Zhong Wang, Zhi Qiang Zhang
• Keywords: Fragment Distribution, Loose Coverage Rock, Sublevel Caving

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