Theoretical and experimental investigation on fracture response of coal impacted by high-velocity water jet

Xiao, Songqiang; Ren, Qingyang; Guan, Ruishi; Li, Jialiang; Wang, Haiyang; Cheng, Yugang; Xie, Wenhao

doi:10.1016/j.egyr.2021.05.029

Cited by 21 publications

(4 citation statements)

References 35 publications

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“…Certain representative parameters, such as the shear stress and principal stress, were selected for the analysis, and the propagation law of stress wave in rock under water jet impinging and failure response of coal was investigated. 29 In this phase, researchers payed attention not only to the stress state of rock but also to the damage distribution and failure mechanism. They explained the mechanism of rock breakage by exploring the variation of different parameters, which is the prevailing analytical method.…”

Section: Introductionmentioning

confidence: 99%

Damage evolution law and failure mechanism of rock impacted by high-pressure water jet under in-situ stress condition

2023

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To investigate the real physical mechanism of rock fragmentation subjected to water jet under in-situ stress condition, a numerical model based on the SPH algorithm was established using the rate-dependent constitutive model to simulate the rock-breaking process. First, the damage evolution law of rock impacted by high-pressure water jet under in-situ stress conditions was studied by analyzing the distribution characteristics of the damage field in the dynamic process of water jet impinging. The results showed that the damage field, widths of surface damage, maximum widths of damage and mean depths of damage of rock decreased with the increase of in-situ stress, indicating that the existence of initial in-situ stress had a strong inhibitory effect on rock fragmentation. The attenuation of the maximum widths of damage could be divided into two stages. The mean depths of damage of rock played a leading role in the number of damage elements. Furthermore, on this basis, the real physical mechanism of rock fragmentation subjected to water jet under in-situ stress condition was revealed by analyzing the stress states and damage history variables of the particles in the selected five typical regions. The study showed that the failure type of the upper rock elements in the crushing zone was brittle failure caused by a combination of compressive stress and shear stress with or without in-situ stress. However, the failure mechanisms of rock elements in crack zone were completely different with or without in-situ stress. In the absence of in-situ stress, the failure type of rock impacted by water jet was the coexistence of damage caused by compressive-shear stress and tensile stress, while in the presence of in-situ stress, the failure type of rock impacted by water jet was mainly the damage caused by compressive-shear stress.

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Section: Introductionmentioning

confidence: 99%

Damage evolution law and failure mechanism of rock impacted by high-pressure water jet under in-situ stress condition

2023

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“…High-pressure water jet technology is an effective method for cutting or breaking targets due to many operational advantages, such as selective removal capability, heatfree, dust-free, and high efficiency. [1][2][3][4][5][6][7][8][9] Due to its unique characteristic, it has been widely used in related engineering fields including oil and gas drilling, rock cutting, mining, machining, cleaning, and rotary jet grouting, and so on. A submerged environment is an important working condition for high-pressure water jet.…”

Section: Introductionmentioning

confidence: 99%

Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Zhang

et al. 2022

Energy Science & Engineering

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A water jet with an air ring protective layer is a promising rock-breaking and cutting rate improvement method in submerged environment, such as oil-gas drilling. The jet flow field characteristic determines the jet impinge performance and is affected by nozzle structure parameters. In this study, the water jet flow with air ring under submerged environment was numerically simulated. The jet flow field structure with air ring was obtained by analyzing the distributions of jet velocity and air content at different cross sections. The effects of several critical nozzle structure parameters on jet isokinetic core length and axial velocity were investigated by adopting the orthogonal design method. The results show that the jet flow field structure with air ring in radial direction includes a high-speed water jet zone, air ring protective layer, and air-water mixed zone, having the advantages of concentrated energy in axis region, long core section length, and lowvelocity attenuation. The influence degrees of nozzle structure parameters on jet core section length and axial velocity at X = 0.3 m are: length-diameter ratio > outlet diameter > conic angle > air nozzle diameter > water-air nozzle spacing and outlet diameter > length-diameter ratio > conic angle > water-air nozzle spacing > air nozzle diameter, respectively. The jet core section length and axial velocity both increase exponentially with the increasing outlet diameter, both first increase rapidly and then slowly decreases with the increase of conic angle and water-air nozzle spacing. There is the optimal conic angle of 15°and appropriate water-air nozzle spacing of 3-5 mm. With the increase of length-diameter ratio, they both first decrease rapidly and then slow down, indicating that conical nozzle is more suitable for water jet with air ring. And 0.9-1.2 mm is proper for the air nozzle diameter.

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“…In the jet-breaking mechanism, the impact stress wave is the main form of action. When the water jet impacts the rock, the high pressure generated in the liquid-solid contact area is transmitted in the form of a stress wave in the rock as a sphere (Lesser 1981;Lesser and Field 1983;Xiao et al 2021) and generates tangential and radial tensile stresses, which subjects the rock to tension followed by compression. When the tensile action exceeds the tensile limit of the rock, the rock cracks (NI et al 2003;Lu et al 2015) and ruptures in the direction of the stress wavefront, forming a circular cracking surface and resulting in laminar cracking of the rock (Xue et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Cracking characteristic induced by supercritical carbon dioxide phase change in micro-cracks of coal

Liu

Shen

Wei

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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The phase-change action causes three phenomena: an increase in the width of the original crack structure of coal, mutual extension and penetration, and generation of new fractures. Fracture evolution process causes coal and cement to be dislodged, forming micropowders, the range of coal particle size is negatively correlated with temperature and pressure of SC-CO 2 . The SC-CO 2 phase change inside coal pores increases pore size and accumulated pore volume. The effect of SC-CO 2 phase-change fracturing is enhanced with increasing temperature and pressure. Article Highlights• Supercritical carbon dioxide phase change acts on the coal and causes it to be destroyed at the microcrack scale. • Supercritical carbon dioxide phase change causes coal fissures to widen, penetrate, extend, and create new cracks. • The phase-change fracturing of a supercritical carbon dioxide jet breaking coal is the cause of coal powders. Keywords Supercritical carbon dioxide jet • Coal powder • The SC-CO 2 phase change fracturing • Original crack • Pore

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Theoretical and experimental investigation on fracture response of coal impacted by high-velocity water jet

Cited by 21 publications

References 35 publications

Damage evolution law and failure mechanism of rock impacted by high-pressure water jet under in-situ stress condition

Damage evolution law and failure mechanism of rock impacted by high-pressure water jet under in-situ stress condition

Flow field characteristic of water jet with air ring protective layer under submerged environment and the orthogonal optimization of nozzle structure

Cracking characteristic induced by supercritical carbon dioxide phase change in micro-cracks of coal

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