Full-scale linear cutting tests to study the influence of pre-groove depth on rock-cutting performance by TBM disc cutter

2022 ◽  
Vol 122 ◽  
pp. 104366
Author(s):  
Biao Li ◽  
Bo Zhang ◽  
Mengmeng Hu ◽  
Bin Liu ◽  
Wenzheng Cao ◽  
...  
Keyword(s):  
Groove Depth ◽  
Rock Cutting ◽  
Full Scale ◽  
Cutting Performance ◽  
Disc Cutter

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

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.

Full-Scale Linear Cutting Tests in Chongqing Sandstone to Study the Influence of Confining Stress on Rock Cutting Forces by TBM Disc Cutter

2018 ◽  
Vol 51 (6) ◽  
pp. 1697-1713 ◽  
Author(s):  
Yucong Pan ◽  
Quansheng Liu ◽  
Jianping Liu ◽  
Xingxin Peng ◽  
Xiaoxuan Kong
Keyword(s):  
Cutting Forces ◽  
Rock Cutting ◽  
Full Scale ◽  
Disc Cutter ◽  
Confining Stress

Full-Scale Rotary Cutting Test to Study the Influence of Disc Cutter Installment Radius on Rock Cutting Forces

2018 ◽  
Vol 51 (7) ◽  
pp. 2223-2236 ◽  
Author(s):  
Yucong Pan ◽  
Quansheng Liu ◽  
Xingxin Peng ◽  
Xiaoxuan Kong ◽  
Jianping Liu ◽  
...  
Keyword(s):  
Cutting Forces ◽  
Rock Cutting ◽  
Full Scale ◽  
Disc Cutter ◽  
Cutting Test ◽  
Rotary Cutting

scholarly journals Numerical Simulation of Rock Plate Cutting with Three Sides Fixed and One Side Free

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Zhenguo Lu ◽  
Lirong Wan ◽  
Qingliang Zeng ◽  
Xin Zhang ◽  
Kuidong Gao
Keyword(s):  
Numerical Simulation ◽  
Cutting Force ◽  
Cutting Speed ◽  
Rock Cutting ◽  
Numerical Results ◽  
Peak Force ◽  
Cutting Performance ◽  
Conical Pick ◽  
Cutting Method ◽  
Cutting Angle

In order to overcome conical pick wear in the traditional rock cutting method, a new cutting method was proposed on account of increasing free surface of the rock. The mechanical model of rock plate bending under concentrated force was established, and the first fracture position was given. The comparison between experimental and numerical results indicated that the numerical method is effective. A computer code LS-DYNA (3D) was employed to study the cutting performance of a conical pick. To study the rock size influenced on the cutting performance, the numerical simulations with different thickness, width, and height of a rock plate was carried out. The numerical simulation with the different cutting parameters of cutting speed, cutting angle, and cutting position influenced on cutting performance was also carried out. The numerical results indicated that the peak force increased with the increasing thickness of rock plate. With the increasing width and height of the rock plate, the peak force decreased and then became stable. Besides, the peak force decreased with the increasing of cutting position lxp/lx. Moreover, the peak force increased and then decreased with the increasing of cutting angle. The cutting speed has nonsignificant influence on the peak force. The strong exponential relationship was obtained between the peak force and cutting position, thickness, height, and width of the rock plate at a confidence level of 0.95. A binomial relationship was observed between the peak force and cutting angel. The cutting force comparison between traditional rock cutting and rock plate cutting indicated that the new cutting method can effectively reduce peak cutting force.

Effect of Abrasive Feed Rate on Rock Cutting Performance of Abrasive Waterjet

2019 ◽  
Vol 52 (9) ◽  
pp. 3431-3442 ◽  
Author(s):  
Tae-Min Oh ◽  
Gun-Wook Joo ◽  
Gye-Chun Cho
Keyword(s):  
Feed Rate ◽  
Rock Cutting ◽  
Cutting Performance ◽  
Abrasive Waterjet

Full-Scale Linear Cutting Tests to Propose Some Empirical Formulas for TBM Disc Cutter Performance Prediction

2019 ◽  
Vol 52 (11) ◽  
pp. 4763-4783 ◽  
Author(s):  
Yucong Pan ◽  
Quansheng Liu ◽  
Xingxin Peng ◽  
Qi Liu ◽  
Jianping Liu ◽  
...  
Keyword(s):  
Performance Prediction ◽  
Full Scale ◽  
Disc Cutter ◽  
Empirical Formulas

scholarly journals Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Yohan Cha ◽  
Tae-Min Oh ◽  
Gye-Chun Cho
Keyword(s):  
Momentum Transfer ◽  
Hard Rock ◽  
Empirical Relationship ◽  
Abrasive Particle ◽  
Rock Cutting ◽  
Maximum Energy ◽  
Cutting Performance ◽  
Granitic Rocks ◽  
Abrasive Waterjet ◽  
Cutting Depth

Abrasive waterjets are being increasingly used in civil engineering for rock and concrete cutting, particularly for the demolition or repair of old structures. The energy of an abrasive waterjet is primarily provided by the accelerated abrasive. The momentum transfer during mixing and acceleration determines the abrasive velocity, which affects the cutting performance. Meanwhile, the geometry of the focus at which mixing occurs influences the momentum transfer efficiency. In this study, the effects of the focus geometry on the optimum abrasive flow rate (AFR) and momentum transfer characteristics in hard rock cutting were investigated. Experiments were conducted using granite specimens to test the AFR under different focus geometry conditions such as diameter and length. The results show that the focus geometry significantly affects the maximum cutting depth and optimum AFR. The maximum cutting energy was analyzed based on the cutting efficiency of a single abrasive particle. In addition, the momentum transfer parameter (MTP) was evaluated from the empirical relationship between the maximum energy and the cutting depth for granitic rocks. Accordingly, a model for estimating the MTP based on the AFR was developed. It is expected that the results of this study can be employed for the optimization of waterjet rock cutting.

scholarly journals Investigation of the influence mechanism of rock damage on rock fragmentation and cutting performance by the discrete element method

2019 ◽  
Vol 6 (5) ◽  
pp. 190116 ◽  
Author(s):  
Si-fei Liu ◽  
Shuai-feng Lu ◽  
Zhi-jun Wan ◽  
Jing-yi Cheng
Keyword(s):  
Cutting Force ◽  
Rock Cutting ◽  
Rock Breaking ◽  
Pulse Number ◽  
Rock Fragmentation ◽  
Cutting Performance ◽  
Tensile Failure ◽  
Rock Damage ◽  
Damage Factor ◽  
Mining Machinery

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.

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