Full-scale linear cutting tests in Chongqing Sandstone to study the influence of confining stress on rock cutting efficiency by TBM disc cutter

In this paper, General Particle Dynamics (GPD3D) is developed to simulate rock fragmentation by TBM disc cutters under different confining stress. The processes of rock fragmentation without confining pressure by one disc cutter and two disc cutters are investigated using GPD3D. The crushed zone, initiation and propagation of cracks, and the chipping of rocks obtained from the proposed method are in good agreement with those obtained from the previous experimental and numerical results. The effects of different confining pressure on rock fragmentation are investigated using GPD3D. It is found that the crack initiation forces significantly increase as the confining stress increases, while the maximum angle of cracks decreases as the confining stress increases. The numerical results obtained from the proposed method agree well with those in previous indentation tests. Moreover, the effects of equivalent confining stress on rock fragmentation are studied using GPD3D, and it is found that rock fragmentation becomes easier when the equivalent confining stress is equal to 15MPa.

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Evaluation of Disc Cutter Performance in Rock Cutting Process Using 3D Finite Element Method

Numerical Methods in Civil Engineering ◽

10.52547/nmce.5.3.1 ◽

2021 ◽

Vol 5 (3) ◽

pp. 1-12

Author(s):

M. Khosravi ◽

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A. Ramezanzadeh ◽

S. Zare ◽

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...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Rock Cutting ◽

Cutting Process ◽

Disc Cutter ◽

3D Finite Element ◽

3D Finite Element Method ◽

Element Method

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A study on the influence of pick geometry on rock cutting based on full-scale cutting test and simulation

Advances in Mechanical Engineering ◽

10.1177/1687814020974499 ◽

2020 ◽

Vol 12 (12) ◽

pp. 168781402097449

Author(s):

Xuefeng Li

Keyword(s):

Shear Failure ◽

Cutting Parameters ◽

Rock Cutting ◽

Rake Angle ◽

Full Scale ◽

Cutting Performance ◽

Tensile Failure ◽

General Process ◽

Multiple Attribute ◽

Cutting Simulations

In this paper, series of full-scale cutting tests and cutting simulations are carried out to investigate the influence of installation parameter and geometry of the pick on cutting performance. The discrete element method is used to simulate the rock cutting process. A general process to calibrate macro properties of rock including uniaxial compressive strength (UCS), elastic modulus, Poisson’s ratio, cohesion and internal friction angle is proposed and used to complete the calibration of coal model. The cutting simulations are performed using picks with different tip angles and rake angles. The results show that the peak cutting force (PCF) decreases with the increase of rake angle following an inverse proportional function when the rake angle is positive, while it varies following a parabolic curve in the condition of negative rake angle. Moreover, the crack mode changes from primarily shear failure to primarily tensile failure with the increase of rake angle. Finally, a multiple-attribute index is proposed to evaluate the cutting performance and select the optimum cutting parameters.

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Tool Force Acting on a Disc Cutter during Circular Rock Cutting. Study on disc cutting of rock(1st Report).

Shigen-to-Sozai ◽

10.2473/shigentosozai.108.557 ◽

1992 ◽

Vol 108 (7) ◽

pp. 557-562 ◽

Cited By ~ 3

Author(s):

Fangming Gong ◽

Kazuhiko SATO ◽

Hideaki ASAI

Keyword(s):

Rock Cutting ◽

Disc Cutter ◽

Disc Cutting ◽

Tool Force

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