Abstract
Dust pollution is a serious environmental hazard during the tunneling in coal mines. Despite the presented dust control technologies, the method of reducing dust production has not been adequately investigated. This paper conducted cutting tests with various tip angles and attack angles using numerical models. A novel method for reducing the production of dust, based on the simulation results, was proposed and verified in the field experiments. The cutting force, work and crack extensions were analyzed. The concentrations of dust in laboratory tests were linked to the simulation results. The simulated results showed that the conical pick with a large tip angle could increase the cutting force and work and cause more cracks. The attack angle had a negative relation with the cutting force and work. The field experiments suggested that the amount of dust could be significantly reduced by using conical picks with a small tip angle. A slower rotation speed of the cutting head could alleviate dust hazards. The results are of momentous relevance for mine managers and researchers to reduce the production of dust during tunneling and control the dust more efficient.
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