Experimental Study of the Rock Cutting Mechanism with PDC Cutter Under Confining Pressure Condition

Liu, Weiji; Deng, Hongxing; Zhu, Xiaohua; Li, Rui; He, Chao

doi:10.1007/s00603-023-03444-7

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…According to Qiao et al [14,15], with the increase of confining pressure, the critical stress of the sample increases and the fragmentation of particles increases. Liu et al [16] found that as the confining pressure increased, the cutting force on single cutters increased as well. From this, it can be seen that rock with loose and porous become denser under confining pressure.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining

Xu,

Wan,

Gao

et al. 2023

Applied Sciences

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Continuous mining is one of the development goals for metal mines, and the application of coal mining equipment represented by shearers provides a reference for continuous mining. However, rock in metal mines is generally harder than coal, making cutting difficult. Improving the surrounding rock conditions is an important way to improve the applicability of the drum for hard rock cutting. Therefore, this article explores the correlation between drum-cutting performance and surrounding rock boundary conditions, aiming to obtain surrounding rock boundary conditions that can help improve drum-cutting performance. To achieve the goal, a model of a shearer drum and hard rock is established using finite element software. With the model, hard rock cutting was simulated and the stress distribution on rock mass, deformation of rock mass, and drum cutting force during the cutting process under different confining pressures were analyzed. Relations between drum cutting force and confining pressure on rock mass were obtained. Then, drum cutting force under different free surfaces of rock mass are studied and the positions of free surface on rock mass that help to reduce the drum cutting force were summarized. According to the research, when the rock mass is under uniaxial compression, drum cutting force increases with the confining pressure on the rock mass; In addition, the free surfaces on the rock mass are proved to be helpful to reduce the drum cutting force. The research content lays the foundation for the boundary conditions required to reduce drum-cutting force in metal mining.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining

Xu,

Wan,

Gao

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

Numerical investigation of thermal damage in rocks under high‐voltage electric pulse

Zhu,

Liu,

Liu

et al. 2024

Contrib. Plasma Phys

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The high‐voltage electric pulse fracturing (HVEPF) technology represents a novel and highly promising approach in rock fracturing. The investigation of thermal damage inflicted upon rocks by high‐voltage electrical pulses under multi‐physical field coupling is of great significance in the development of deep geothermal energy. This study establishes a damage model for rocks under electric fragmentation conditions by integrating electric field, heat transfer field, and solid mechanics field. Based on the developed damage model, the insulating properties, temperature variations, and forms of damage of rocks during electric fracturing are explored. Subsequently, the influence of voltage on rock damage status is investigated. The findings reveal that damage to the rock does not occur immediately after electrical breakdown; rather, it increases with the growth of current and temperature within the breakdown channel. Initial damage occurs at the ends of the breakdown channel, followed closely by damage in the central region of the channel. The predominant form of damage in rocks is tensile failure, with shear failure playing a secondary role, and the volume of damage increases with voltage. These results elucidate the characteristics of rock damage during electric fracturing, providing valuable insights for the engineering application of electric fracturing techniques.

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The Rock Fragmentation Mechanism in Rock Cutting with PDC Cutter Under Hydrostatic Pressures

Liu,

Deng,

Zhu

2024

Rock Mech Rock Eng

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Experimental Study of the Rock Cutting Mechanism with PDC Cutter Under Confining Pressure Condition

Cited by 8 publications

References 38 publications

Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining

Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining

Numerical investigation of thermal damage in rocks under high‐voltage electric pulse

The Rock Fragmentation Mechanism in Rock Cutting with PDC Cutter Under Hydrostatic Pressures

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