Optimal drilling pressure of cone-tipped cutters based on characteristic size of hard and brittle rocks

TAN Hao; JI Hong-guang; ZENG Zhi-yuan; LIU Zhi-qiang

doi:10.11779/CJGE202004023

Volume 42 Issue 4

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Chinese Journal of Geotechnical Engineering > 2020 > 42(4): 782-789. > DOI: 10.11779/CJGE202004023

TAN Hao, JI Hong-guang, ZENG Zhi-yuan, LIU Zhi-qiang. Optimal drilling pressure of cone-tipped cutters based on characteristic size of hard and brittle rocks[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(4): 782-789. DOI: 10.11779/CJGE202004023

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Optimal drilling pressure of cone-tipped cutters based on characteristic size of hard and brittle rocks

1.
University of Science and Technology Beijing, Civil Engineering and Resources Engineering, Beijing 100083, China
2.
Beijing China Coal Mine Engineering Co., Ltd., Beijing 100013, China
3.
Sinosteel Anhui Tianyuan Technology Co., Ltd., Ma’anshan 243000, China

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Received Date: May 23, 2019
Available Online: December 07, 2022

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Abstract

In order to improve the rock-breaking efficiency of raising boring cutters under hard brittle rock, it is necessary to obtain the optimal drilling pressure. The analysis of the size of rock ballast is an important means. The cone-tipped cutter is used to break hard brittle marble samples on the LCM testing machine, and the rock ballast is analyzed by means of the Rosin-Rammler distribution. By comparing the cumulative probability curve of size distribution of rock ballast, the characteristic size and specific energy under multiple drilling pressures, the relationship among drilling pressure, the characteristic size of rock ballast and specific energy are obtained. The optimum drilling pressure of marble samples is 34.45 and 35.19 kN respectively when the characteristic size is the largest and the specific energy is the smallest, so it is suggested that the drilling pressure should be set as 35 kN. The size distribution between hard brittle marble and granite is also analyzed under the same drilling pressure, and the characteristic sizes are obtained under different uniaxial compressive strengths. The results show that the characteristic size can reflect the rock-breaking effect of cone-tipped cutter, and the rock-breaking process conforms to the new surface theory of Rittinger. The characteristic size and specific energy are inversely proportional. Within a certain range of drilling pressure, the characteristic size of granite is larger than that of hard brittle marble, and the difference of characteristic size increases with the increase of drilling pressure.
- cone-tipped cutter,
- rock ballast,
- Rosin-Rammler distribution,
- characteristic size,
- specific energy,
- optimal drilling pressure

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Optimal drilling pressure of cone-tipped cutters based on characteristic size of hard and brittle rocks

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