Fracture Characteristics of Orebody Rock with Varied Grade Under Dynamic Brazilian Tests

Liu, Bing; Gao, Yongtao; Jin, Aibing; Elmo, Davide

doi:10.1007/s00603-020-02048-9

Cited by 14 publications

(2 citation statements)

References 57 publications

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“…Therefore, in the process of tunnel construction and excavation, the development of construction plans and the design of tunnel support structures often focus on considering rock damage [2][3][4]. At present, domestic and foreign researchers have done a lot of work on rock mass damage caused by single blasting load, and have achieved many research results [5,6]. In the actual tunnel construction process, the blasting damage to the rock mass is actually a cumulative and superimposed process.…”

Section: Introductionmentioning

confidence: 99%

Research on the Cumulative Damage Law of Surrounding Rock under Cyclic Blasting Action

2024

J. Phys.: Conf. Ser.

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In order to study the cumulative damage characteristics and laws of rock masses under cyclic blasting loads, based on the finite element software ANSYS/LS-dyna and the HJC constitutive model, a single blasting damage analysis is conducted first, and the accuracy of the results is verified. On this basis, numerical simulation studies on the cumulative damage of rock masses under cyclic blasting are carried out separately. The results indicate that the cumulative damage evolution cloud map of the rock mass under cyclic blasting is similar to that of a single blasting action, showing an inverse S-shape overall. The damage increment of the rock mass decreases with the increase of blasting times, and in the central area of the damage zone, the rock mass is particularly affected by the superimposed effect of cyclic blasting loads. Cyclic blasting fully reflects the accumulation of damage to the rock mass under multiple cyclic blasting loads, and there is a certain relationship between rock mass damage and the distance between the blasting centers. As the distance between the blasting centers increases, the amount and increment of rock mass damage generated by blasting continue to decrease.

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Section: Introductionmentioning

confidence: 99%

Research on the Cumulative Damage Law of Surrounding Rock under Cyclic Blasting Action

2024

J. Phys.: Conf. Ser.

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“…Additionally, they examined the relationship between Type I-II composite ratio and pure Type II loading angle as well as specimen size for Type II dynamic fracture toughness analysis. Lu et al [36] used the SHPB device to apply radial loading on Brazilian disc marble samples containing preexisting cracks and herringbone grooves, enabling an analysis of the dynamic fracture behavior and energy dissipation characteristics during sample failure. Gao et al [37], utilizing SHPB in conjunction with digital image correlation (DIC) technology and NSCB method, investigated the influence of loading rate on Laurentian granite, examining the relationships between fracture time, fracture toughness, crack growth rate, and loading rate as well as the correlation between fracture toughness and crack growth rate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Tensile Mechanical Behavior and Fracture Mechanical Characteristics of Sandstone with a Single Prefabricated Fissure

Wu,

Du,

Wang

et al. 2024

Advances in Civil Engineering

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The structural stability of engineering rock mass under dynamic disturbance is directly associated with the fracture mechanics properties in engineering practice. Fully understanding the rock’s fracture mechanical behavior and crack evolution caused by stress concentration at the crack tip in engineering rock mass under dynamic load can offer useful insight into the rock’s dynamic fracture mechanism. A dynamic test using split-Hopkinson pressure bar (SHPB) test system was performed on a single prefabricated fissure sandstone centrally cracked Brazilian disk (CCBD) specimens. Based on the theory of fracture mechanics and one-dimensional stress wave theory, the dynamic crack initiation criterion of CCBD specimen is proposed, and the regression model of sandstone’s dynamic fracture toughness under the coupling effect of fissure angle and strain rate is established by using response surface methodology (RSM). The influence of strain rate and fissure angle on stress wave characteristics, dynamic tensile mechanical behavior, and fracture mechanics characteristic was investigated in this study. The findings demonstrate that: (1) The fissure angle plays a pivotal role in determining the failure mode of sandstone. As the fissure angle increases, three distinct failure modes emerge in the sandstone specimens, while variations in strain rate have minimal impact on the fracture mode of these specimens. (2) Alterations in the fissure angle result in changes to the waveform of transmitted waves. When the fissure angle is below 30°, the transmitted wave exhibits “double peak” characteristics; when it exceeds 30°, a “single peak” waveform is observed. This phenomenon can be attributed to diffraction principles governing incident waves. (3) When the impact pressure is 0.2 MPa, the peak load initially exhibits an increase followed by a decrease, with the peak load reaching its maximum at a fracture angle of 60°; when the impact pressures are 0.3 and 0.5 MPa, there exists a negative correlation between the peak load and the fissure angle. (4) The influence of strain rate on sandstone’s fracture resistance is predominant, with alterations in fissure angle exerting an auxiliary effect on this property. The research results can provide a theoretical and experimental basis for dynamic disaster prevention in urban underground space.

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Dynamic mechanical properties of an ore rock with varying grade and engineering applications in mines

Liu

Gao

Jin

2021

Engineering with Computers

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Fracture Characteristics of Orebody Rock with Varied Grade Under Dynamic Brazilian Tests

Cited by 14 publications

References 57 publications

Research on the Cumulative Damage Law of Surrounding Rock under Cyclic Blasting Action

Research on the Cumulative Damage Law of Surrounding Rock under Cyclic Blasting Action

Experimental Study on Dynamic Tensile Mechanical Behavior and Fracture Mechanical Characteristics of Sandstone with a Single Prefabricated Fissure

Dynamic mechanical properties of an ore rock with varying grade and engineering applications in mines

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