Investigation of the influence mechanism of rock damage on rock fragmentation and cutting performance by the discrete element method
Autor: | Cheng Jingyi, Sifei Liu, Shuaifeng Lu, Zhijun Wan |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0209 industrial biotechnology
Multidisciplinary 0211 other engineering and technologies 02 engineering and technology design optimization Discrete element method Rock cutting 020901 industrial engineering & automation Key factors Engineering Rock mechanics cutting mechanics Cutting mechanics Geotechnical engineering lcsh:Q rock cutting Model choice lcsh:Science Geology 021101 geological & geomatics engineering Research Article rock mechanics |
Zdroj: | Royal Society Open Science Royal Society Open Science, Vol 6, Iss 5 (2019) |
ISSN: | 2054-5703 |
Popis: | Rock damage is one of the key factors in the design and model choice of mining machinery. In this paper, the influence of rock damage on rock fragmentation and cutting performance was studied using PFC 2D . In PFC 2D software, it is feasible to get rock models with different damage factors by reducing the effective modulus, tensile and shear strength of bond by using the proportional factors. A linear relationship was obtained between the proportion factor and damage factor. Furthermore, numerical simulations of rock cutting with different damage factors were carried out. The results show that with the increase of damage factor, the rock cutting failure mode changes from tensile failure to brittle failure, accompanied by the propagation of macro cracks, the formation of large debris and a notable decrease in the peak cutting force. The mean cutting force is negatively correlated with the damage factor. Besides this, the instability of cutting force was evaluated by the fluctuation index and the pulse number of unit displacement. It was found that the cutting force was quite stable when the damage factor was 0.3, which improves the reliability of cutting machines. Finally, the cutting energy consumption of rock cutting with different damage factors was analysed. The results reveal that an increase of damage factor can raise the rock cutting efficiency. The aforementioned findings play a significant role in the development of assisted rock-breaking technologies and the design of cutting head layout of mining machinery. |
Databáze: | OpenAIRE |
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