The percussive process and energy transfer efficiency of percussive drilling with consideration of rock damage

Song, Hengyu; Shi, Huaizhong; Ji, Zhaosheng; Wu, Xiaoguang; Li, Gensheng; Zhao, Haijun; Wang, Gaosheng; Liu, Yong; Xinxu, Hou

doi:10.1016/j.ijrmms.2019.04.012

Cited by 39 publications

(12 citation statements)

References 33 publications

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“…The results indicate that the sinusoidal waveform generated by the impact hammer has the highest rock-breaking efficiency. This is consistent with the conclusions of Song et al 12 Comparing Figures 20 and 21, we can find that the effects of different waveforms on the cutter temperature are consistent with its effects on the rock broken volume. The main reason is that the instantaneous depth of cut and slip speed of the cutter will increase correspondingly under the condition of significant input energy.…”

Section: Effects Of Impact Parameters Onsupporting

confidence: 92%

“…At present, rotary percussive drilling and torsional impact drilling technology are the most widely studied and applied percussive drilling technologies, which can be seen from previous studies. [8][9][10][11][12] Compound impact drilling technology combined the advantages of rotary and torsional percussion drilling technology, which can provide additional instantaneous WOB and TOB for bit simultaneously. 13,14 The rock below and in front of the cutter could be destroyed under the compound impact, forming a threedimensional rock-breaking effect.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation on rock‐breaking mechanism and cutting temperature of compound percussive drilling with a single PDC cutter

Wang

Liu

et al. 2021

Energy Science & Engineering

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Compound percussive drilling technology is a new method to improve the rockbreaking efficiency in deep hard formation. In order to study the rock-breaking mechanism of compound impact drilling, the thermal-structure coupling simulation of the dynamic rock-breaking process with a single PDC cutter was investigated by using ABAQUS software. The influence of impact parameters on the rock-breaking performance and cutting temperature was analyzed. The results proved that the compound impact load changes the rock failure mode and improves the rock-breaking efficiency. Compared with steady load cutting, the rock broken volume under compound impact increased by 7.5%, and the mechanical specific energy (MSE) decreased by 12.3%. As the axial impact load amplitude increases, the MSE increases gradually. With an increase in torsional impact load amplitude and impact frequency, the MSE decreases first and then increases, and the optimal torsional static load ratio is 0.3, and the optimal impact frequency is 30 Hz. In addition, the cutting temperature of the compound percussive drilling is higher than that of the steady load cutting, and it increases with the impact load amplitude and decreases with the frequency. For the three impact load waveforms-sine, triangle, and square in this paper, the rock-breaking efficiency under the condition of sine waveform is the largest when the dynamic amplitude of the pulse force is fixed, and the cutting temperature under the condition of square waveform is the highest. Finally, based on the analysis of the rockbreaking mechanism, a novel compound percussive drilling tool was designed and tested in the field.

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Section: Effects Of Impact Parameters Onsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Numerical investigation on rock‐breaking mechanism and cutting temperature of compound percussive drilling with a single PDC cutter

Wang

Liu

et al. 2021

Energy Science & Engineering

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“…[76] After being hit by a driving hammer, the drilling rod transfers a compressive stress pulse through the drill bit crushing the material below the indenter with radial tensile cracking expending around the impacted zone. [77] Consequently, apart from confined material response, [78] the dynamic tensile response plays an important role in optimising the drilling process. [79] Furthermore, hard rock formations can contain various embedded layers or pre-existing cracks which may influence a pronounced asymmetric material response from compression and tension.…”

Section: Application On a Bohus Granitementioning

confidence: 99%

Validation of the photomechanical spalling test in the case of non‐linear dynamic response: Application to a granite rock

Lukić

Saletti

Forquin

2020

Strain

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In this paper, the use of the virtual fields method for the identification of a strongly asymmetric compression-tension response of rock-like materials under dynamic tensile loading is investigated. The photomechanical spalling setup is used, which induces an indirect tensile load in a non-balanced sample, and the inertial component of the test is directly related to the measured dynamic stress with no previous assumption on the material behaviour. This experimental method provides a direct route to identifying the material asymmetric constitutive response in compression and tension under a uniaxial stress state as well as the material non-linear response after tensile strength is reached. To validate this approach, the entire measurement chain for the case of a post-peak response is investigated through simulated experiments that incorporate a damage model and synthetic grid images. Finally, the method is applied to the case of granite rock, namely, a Bohus granite, as to directly measure the material asymmetric compression-tension and the softening response after peak tensile stress. K E Y W O R D S damage, dynamic tension, simulated experiments, the grid method, the virtual fields method, ultra-high speed imaging

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“…When the equivalent plastic strain of the rock σ y0 reaches the equivalent plastic strain of complete failure, D � 1. Also, the rock element will exfoliate from the rock mass without load and be deleted from the model [27][28][29][30]. en, new elements continue to contact the tool and endure another period of elastic-plastic deformation and destruction.…”

Section: Rock Damage Model and Cutting Separation Criteriamentioning

confidence: 99%

Stress Distribution and Fluctuation Cycle on the Rack Face of the Rock Cutting Tool

Yang

Xue

Zhou

2019

Shock and Vibration

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The distribution of the stress field on the rack face has significant impacts on the performance and service life of the rock cutting tool. A dynamic simulation model of the stress on the rock cutting tool is established by finite element code Abaqus, and the distribution of local stress on the rack face and its impact factors are studied. It is concluded that the local stress on the rack face of the rock cutting tool shows obvious periodical fluctuation characteristics, and the fluctuation cycle of each point on the tool remains unchanged under the same cutting conditions. The stress fluctuation cycle period decreases with the increase of cutting speed inversely. The cutting depth and the back angle of the cutting tool have no obvious impact on the stress fluctuation period. However, the cutting depth and the back angle have obvious impacts on the average stress distributions of each point on the rack face of the tool. That is, the increase of back angle and cutting depth could cause the maximum stress point of the rack face to move upward to the tool tip.

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The percussive process and energy transfer efficiency of percussive drilling with consideration of rock damage

Cited by 39 publications

References 33 publications

Numerical investigation on rock‐breaking mechanism and cutting temperature of compound percussive drilling with a single PDC cutter

Numerical investigation on rock‐breaking mechanism and cutting temperature of compound percussive drilling with a single PDC cutter

Validation of the photomechanical spalling test in the case of non‐linear dynamic response: Application to a granite rock

Stress Distribution and Fluctuation Cycle on the Rack Face of the Rock Cutting Tool

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