Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

Qiu, Jiadong; Li, Diyuan; Li, Xibing; Zhou, Zilong

doi:10.1155/2017/7687802

Cited by 20 publications

(14 citation statements)

References 25 publications

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“…The PFC2D framework was selected to simulate our SHPB impact experiment as it provides both a scientific tool to investigate the micromechanisms that combine to produce complex macroscopic behaviors and an engineering tool to predict these macroscopic behaviors [ 48 ]. PFC2D can be used to simulate many scientific problems in rock mechanics and rock engineering [ 49 ], and it is also widely used in SHPB dynamic testing [ 23 , 50 , 51 , 52 , 53 ].…”

Section: Micro Modelmentioning

confidence: 99%

“…The framework includes two basic bonding models: parallel bond model (PBM) and contact bond model (CBM). The PBM provides the force-displacement behavior of a finite-sized piece of cementitious material deposited between two pieces, acting in parallel with a linear model [ 53 ]. The particle can freely move in the shear and normal direction and rotate between particles.…”

Section: Micro Modelmentioning

confidence: 99%

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Dynamic Response of Rock-like Materials Based on SHPB Pulse Waveform Characteristics

et al. 2021

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Rock-like brittle materials under dynamic load will show more complex dynamic mechanical properties than those under static load. The relationship between pulse waveform characteristics and strain rate effect and inertia effect is rarely discussed in the split-Hopkinson pressure bar (SHPB) numerical simulation research. In response to this problem, this paper discusses the effects of different pulse types and pulse waveforms on the incident waveform and dynamic response characteristics of specimens based on particle flow code (PFC). The research identifies a critical interval of rock dynamic strength, where the dynamic strength of the specimen is independent of the strain rate but increases with the amplitude of the incident stress wave. When the critical interval is exceeded, the dynamic strength is determined by the strain rate and strain rate gradient. The strain rate of the specimen is only related to the slope of the incident stress wave and is independent of its amplitude. It is also determined that the inertia effect cannot be eliminated in the SHPB. The slope of the velocity pulse waveform determines the strain rate of the specimen, the slope of the force pulse waveform determines the strain rate gradient of the specimen, and the upper bottom time determines the strain rate of the specimen. It provides a reference for SHPB numerical simulation. A dynamic strength prediction model of rock-like materials is then proposed, which considers the effects of strain rate and strain rate gradient.

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Section: Micro Modelmentioning

confidence: 99%

Section: Micro Modelmentioning

confidence: 99%

Dynamic Response of Rock-like Materials Based on SHPB Pulse Waveform Characteristics

et al. 2021

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“…Liu et al [17][18][19][20][21][22] analyzed shales under complex geological conditions; simulation software pEDFM was used to construct analytical models for controlling the connection and optimization between volumes. Zhang et al [23][24][25][26][27][28][29] carried out SHPB tests on sandstone under different impact conditions and obtained stress-strain curves and rock fragmentation, and the peak strain, particle size distribution, and energy dissipation of sandstone were further analyzed. Metamorphic limestone is one of the main lithologies in the Dahongshan mining area in Yuxi city, Yunnan province; the existing static parameters cannot meet the needs of mine production and scientific research modeling.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

et al. 2021

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To study the dynamic damage and fracture of metamorphic limestone under explosive load and the stability of the surrounding rock, the stress-strain curve, fracture morphology, and energy dissipation characteristics of metamorphic limestone in the Dahongshan mining area under different strain rates were studied by the Hopkinson pressure bar (SHPB), stress wave analysis, and fractal theory. The experimental results show that the crushing form and degree are significantly affected by the loading strain rate. There are several typical failure modes. When the strain rate is 17.56 s−1, there is no obvious failure except corner cracks. When the strain rate is between 26.92 s−1 and 56.18 s−1, the failure mode of the specimen is axial splitting failure, and when the strain rate is 67.34 s−1, splitting and shearing failure occur. With the increase of the strain rate, the growth rate of the dynamic compressive strength slows down. Compared with static compressive strength, the strength factor increases from 1.15 to 4.19. Also, the fractal dimension shows a gentle increase. When Df is in the range of 1.82~2.24, there is a sudden change in fragmentation when the strain rate is in the range of 34.70 s−1~56.18 s−1. Energy dissipation density increases logarithmically with the strain rate. The results reveal the dynamic breaking and energy consumption laws of metamorphic limestone under impact loads with different strain rates and could provide some reference value for the safe and efficient construction in the Dahongshan mining area and similar engineering projects.

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“…Through theoretical analysis [7][8][9], similarity simulation [10,11], numerical simulation [12][13][14][15], and acoustic emission testing [16][17][18][19], a large number of scholars have systematically studied layered composite rock masses from the perspective of macro-deformation Symmetry 2021, 13, 1132 2 of 18 and micro-damage. A layered rock mass is generally regarded as a transversely isotropic rock mass, and the most influential criterion is the Jaeger failure criterion based on the relationship between the interlayer shear force and bedding dip angle [7].…”

Section: Introductionmentioning

confidence: 99%

Particle Flow Simulation of the Strength and Failure Characteristics of a Layered Composite Rock-Like Sample with a Single Hole

Wang

Song

et al. 2021

Symmetry

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Layered rock masses with holes are common in nature. Their mechanical behavior plays an important role in the safety and stability of engineering structures. However, previous studies have concentrated on a single lithological layer, and few studies have reported on the mechanical behavior of layered rock masses with holes. Based on the concept of symmetry, uniaxial compression tests and numerical simulations were performed on rock-like specimens with three layers and a hole in the interlayer. The hole was in the center of the sample and was symmetrical up and down. The influence of the thickness and strength of the interlayer on the mechanical behavior and failure processes of the layered rock masses with holes was investigated. The results show that the peak strength and elastic modulus were associated with the thickness and strength of the interlayer. Three failure modes were observed in the specimens, which were not only related to the thickness and strength of the interlayer, but also affected by the presence of the hole. When the thickness of the interlayer is small, mainly a single failure mode was observed (tensile failure or shear failure). However, when the interlayer was thick, the failure mode was tension-shear mixed failure. The failure mechanism of the specimens was primarily crack propagation at the edge of the hole. These research results can provide a basis for site selection, and the design of surrounding rock protection and support parameters, and thus have important practical significance for improving surrounding rock stability and ensuring construction safety.

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Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

Cited by 20 publications

References 25 publications

Dynamic Response of Rock-like Materials Based on SHPB Pulse Waveform Characteristics

Dynamic Response of Rock-like Materials Based on SHPB Pulse Waveform Characteristics

Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

Particle Flow Simulation of the Strength and Failure Characteristics of a Layered Composite Rock-Like Sample with a Single Hole

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