Numerical simulation and experimental investigation on fracture mechanism of granite by laser irradiation

Li, Meiyan; Han, Bo; Zhang, Shiyi; Song, Laizhou; He, Qingbo

doi:10.1016/j.optlastec.2018.03.016

Cited by 27 publications

(8 citation statements)

References 13 publications

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“…In the aspect of simulation research of laser breaking rock, based on the thermodynamic theory, the damage evolution process of rock during laser irradiation is investigated by simulation [17][18][19][20]. The purpose of this investigation is to explore the influence of laser parameters on the rock damage morphology, changes in temperature field, and the weakening degree of the rock strength, so as to analyze the breaking-rock mechanism of laser.…”

Section: Introductionmentioning

confidence: 99%

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Zhang

Kuang

Liu

et al. 2023

Period. Polytech. Civil Eng.

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Rock breaking by laser-assisted disc cutters is a novel high-efficiency rock breaking mode that combines mechanical stress induced by the disc cutters with thermal cracking by laser. This paper presented a “step-by-step” simulation modeling concept, and conducted an in-depth study on potential influencing factors of simulation accuracy at each key step. First, the prediction accuracy of laser holes in laser drilling simulation was discussed. Second, the SHPB simulation and experiment were carried out to evaluate the accuracy of the selected material constitutive model in simulating the dynamic fracture damage of rock. Then, taking the laser-assisted rock-penetrating process of the scaled disc cutter as an example, the simulation prediction accuracy of rock-breaking by the disc cutter was analyzed. Finally, the simulation and experiment of laser-assisted disc cutter penetration into rock was carried out, and then the feasibility of the “step-by-step” concept was analyzed. The results show that: (1) in the laser drilling simulation, the predicted accuracy of laser hole size is higher when the power is low; with the laser power increases, the large amount of glass glaze will affect the subsequent modeling accuracy; (2) the HJC model can be used to simulate the transient nonlinear fracture damage behavior of granite; (3) the damage morphology of the granite obtained by the penetration simulation is highly similar to the experimental results, and the load curve should be corrected by the peak point fitting method. The results show the application prospects of the proposed numerical modeling method in future laser-assisted TBM tunnelling.

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Section: Introductionmentioning

confidence: 99%

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Zhang

Kuang

Liu

et al. 2023

Period. Polytech. Civil Eng.

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“…In addition, hydraulic fracturing also has some deficiencies, including high-initiation pressure, pore plugging in the water-sensitive stratum and groundwatercontamination risk [18]. In order to avoid these problems caused by hydraulic fracturing, a series of waterless fracturing measures were developed by researchers to crack the hard rock, such as gas fracturing [19,20], liquid-nitrogen fracturing [21][22][23], thermal spallation fracturing [24,25], microwave fracturing [26][27][28][29] and laser fracturing [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Compressive Strength, Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam

Kuang

Sun

et al. 2022

Applied Sciences

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Efficient fracturing is the key issue for the exploitation of geothermal energy in a Hot Dry Rock reservoir. By using the laser irradiation cracking method, this study investigates the changes in uniaxial compressive strength, ultrasonic characteristics and crack distributions of granite specimens by applying a laser beam under various irradiation conditions, including different powers, diameters and moving speeds of the laser beam. The results indicate that the uniaxial compressive strength is considerably dependent on the power, diameter and moving speed of the laser beam. The ultrasonic-wave velocity and amplitude of the first wave both increase with a decreased laser power, increased diameter or moving speed of the laser beam. The wave form of irradiated graphite is flattened by laser irradiation comparing with that of the original specimen without laser irradiation. The crack angle and the ratio of the cracked area at both ends are also related to the irradiation parameters. The interior cracks are observed to be well-developed around the bottom of the grooving kerf generated by the laser beam. The results indicate that laser irradiation is a new economical and practical method that can efficiently fracture graphite.

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“…Based on numerical simulation, it was found that large thermal stress was generated at the location of sudden temperature change in rock during the perforation process, and the initial zone of microcracks was predicted [27]. Li and Ndeda et al established the finite element model; the causes of microcracks and the impact of thermal stress on the cracks extending were studied based on the analysis of the thermal stress during the granite perforation [28][29][30]. However, the current numerical simulation studies lack a complete description of the phase transition process of rock under the laser irradiation, which could not systematically reflect the specific process of rock laser perforation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Hard Rock Breaking with Fiber Laser: Surface Failure Characteristics and Perforating Mechanism

Yang

Zhou

Zhu

et al. 2020

Advances in Civil Engineering

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The rock-breaking characteristics and the influence factors of laser perforation are investigated in this study. A series of fiber laser perforation experiments on basalt, sandstone, and granite were conducted. Experimental measurements of rock failure morphologies and composition tests showed that the main surface features are thermal cracks and glazed layer formed by the melting and condensing of rock in laser perforation. It is also found that higher quartz content could help reduce the glazed degree of rock. Comprehensive results showed that the laser rock perforation is mainly formed by thermal fractures, the decline of molten pool, and the evaporating and splashing of the special melted rock components. The depth of rock perforation and SE usually increase with the laser irradiation time, while the ROP gradually decreases. With the increase of laser power, the perforation depth and ROP gradually increase, while the SE initially decreases and then increases indicating that there is an optimal power that maximizes perforation efficiency. It is believed that the strength of rock is the main factor affecting laser perforation efficiency, and the lower rock strength resulted in deeper perforation depth, higher ROP, and lower SE.

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Numerical simulation and experimental investigation on fracture mechanism of granite by laser irradiation

Cited by 27 publications

References 13 publications

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Experimental Investigation on Compressive Strength, Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam

Experimental Investigation on Hard Rock Breaking with Fiber Laser: Surface Failure Characteristics and Perforating Mechanism

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