Study on Rock-Breaking Depth and Damage Area under Particle Jet Impact

Ren, Fushen; Fang, Tiancheng; Cheng, Xiaoze

doi:10.1155/2020/4140165

Cited by 5 publications

(4 citation statements)

References 36 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, for the effective stress of elastic limit σ Hel : Where, F c is compressive strength, and it has been measured by rock compression test [ 16 , 30 ].…”

Section: Working Principle and Rock-breaking Mechanismmentioning

confidence: 99%

Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

et al. 2021

Self Cite

View full text Add to dashboard Cite

Aimed at the technical problems of low drilling speed and difficult rock-breaking in deep-well and hard rock-stratum, particle waterjet coupled impact rock-breaking technology in rotary drilling is put forward in this paper. Firstly, the working principle of particle jet impact rock-breaking in rotary drilling was introduced, and the acceleration model of particle jet and the damage model of rock were established. The acceleration mechanism of particles and dynamic damage evolution process of rock under particle jet were studied, which showed that the broken pit and rock damage would increase with time gone on, and damage evolution of rock presented the radial expansion. Then, experimental device of particle jet coupled impact rock-breaking in rotary state was developed, and the effect of jet parameters on penetration depth and failure volume was analyzed with comparison of la experiment and numerical simulation. The results showed that drilling speed with particle jet impact is twice that of conventional drilling, and combination nozzles layout of impact angle with 8°and 20° can achieve rock-drilled rapidly, which also demonstrated the correctness of simulation method. The device development and the rock-breaking results analysis would be of great value for engineering application.

show abstract

“…Meanwhile, for the effective stress of elastic limit σ Hel : Where, F c is compressive strength, and it has been measured by rock compression test [ 16 , 30 ].…”

Section: Working Principle and Rock-breaking Mechanismmentioning

confidence: 99%

Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Improving the jet pressure and changing the jet structure can improve the rockbreaking capacity of the jet [3,4]. The existing single-nozzle rotating double-jet structure and single-nozzle multihole jet structure are mainly used in drilling operations in the oil and coal industries, and the rock-breaking efficiency of the multihole nozzle is much higher than the rock-breaking efficiency of the combination rotary direct jet and rotary jet [5].…”

Section: Introductionmentioning

confidence: 99%

Rock-Breaking Characteristics of High-Pressure, Dual-Stranded Water Jets

Pan,

Zhai,

Pei

et al. 2023

Processes

View full text Add to dashboard Cite

Because of the unclear understanding of the characteristics associated with coupled rock breaking using multiple water jets, a numerical model combining smoothed particle hydrodynamics (SPH) and the finite element method (FEM) was established to investigate the rock-breaking capacity of a high-pressure, double-stranded water jet structure. The effectiveness of this model was verified through field experiments. The study further examined the specific energy required for rock breaking using the high-pressure double water jets and analyzed the effects of jet pressure, nozzle diameter, jet impact angle, and impact point spacing on rock-breaking volume. The results demonstrate that the rock-breaking ability of a high-pressure double water jets is better than that of a single water jet. When the impact angle of the high-pressure double water jets was 15° and the distance between impact points was 2.0 d, the rock damage effect was the best. By comparing the specific energies for rock breaking of a single water jet and a double water jet, it was concluded that the best rock-breaking nozzle diameter is 1.6 mm. Furthermore, an orthogonal testing approach was employed to determine the main and secondary factors influencing the rock-breaking energy of the high-pressure double water jet. The order of significance was found to be jet pressure > impact angle > impact point spacing > nozzle diameter. These findings provide valuable guidance and reference for application in the coal mining industry.

show abstract

“…e rock cuttings are discharged by using flushing water or air. Under the action of propulsion provided by the hydraulic cylinder, the drill continuously impacts, rotates, and discharges rock cuttings to form the blast hole [4,5]. e working principle is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Research on the Matching of Impact Performance and Collision Coefficient of Hydraulic Rock Drill

2021

Shock and Vibration

View full text Add to dashboard Cite

The stress wave produced by the piston impact, on the drill rod, is an important factor affecting impact performance. It is particularly important to control the stress waveform generated by the piston impact on the drill rod to meet the requirements of efficiency and component durability of some impact mechanical systems. Based on wave theory, the impact stress wave model of rock drilling is established, a dimensionless collision coefficient γ is put forward, and the matching relationship between different collision coefficients γ and stress waveforms is analysed. The length of the impact piston under the same material condition determines the change rule of the waveform. The stress waveform experimental verification is thus designed. The pressure chamber curves of different pistons in the rock drill were tested, the collision velocity of the piston was obtained, and the impact energy and impact power were calculated. The relationship between the impact performance and the collision coefficient γ is analysed. When γ is in the range of 9–11, the impact piston’s design of a high-power rock drill can be satisfied. When γ is in the range of 3∼5, it is mainly designed for low-power rock drills.

show abstract

Study on Rock-Breaking Depth and Damage Area under Particle Jet Impact

Cited by 5 publications

References 36 publications

Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

Rock-Breaking Characteristics of High-Pressure, Dual-Stranded Water Jets

Research on the Matching of Impact Performance and Collision Coefficient of Hydraulic Rock Drill

Contact Info

Product

Resources

About