Analysis of Rock Damage Characteristics Based on Particle Discrete Element Model

Zhao, Zhenlong; Wang, Xiao; Wen, Zhen

doi:10.1007/s10706-017-0363-0

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…PFC software 7.0 is a discrete element particle flow analysis program widely used in meso-and macroscopic damage evolution and crack propagation during the loading process of rock materials [24][25][26]. In this paper, the built-in programming language was used to model a mixture of soil and rock composed of soil and stone with different particle sizes.…”

Section: Numerical Simulation Of Particle Flow Programsmentioning

confidence: 99%

Experimental Study on Macroscopic Mechanical Characteristics and Microscopic Pore Structure Evolution of Soil–Rock Mixture under Repeated Freeze–Thaw Cycles

Deng,

Zhao,

Xiao

et al. 2023

Applied Sciences

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The response characteristics of the mesostructure and macro-characteristics of the soil–rock mixture under repeated freeze–thaw action have an important influence on the safety and stability of the dump slope in low-temperature environments. In order to further understand the multi-scale response behavior of a soil–rock mixture under freeze–thaw cycles, this paper carried out indoor freeze–thaw cycles, uniaxial compression, and electrochemical impedance spectroscopy tests on a soil–rock mixture taken from a graphite mine dump in Jixi City, Heilongjiang Province, China. Combined with the simulation calculation of discrete element numerical software (PFC2D 7.0), the effects of freeze–thaw cycling on electrochemical impedance spectrometry (EIS) mesoscopic parameters, uniaxial compressive strength, and crack propagation of soil–rock mixtures were analyzed. The intrinsic relationship between mesoparameters and macroscopic mechanical properties was established. The results showed that as the number of freeze–thaw cycles increases from 0 to 15, the mesopores inside the soil–rock mixture gradually increase, and the angular similarity of distribution characteristics increases by 5.25%. The uniaxial compressive strength and the peak secant modulus increase exponentially with the increase in the number of freeze–thaw cycles, the uniaxial compressive strength decreases by 47.62%, and the peak secant modulus decreases by 75.87%. The peak strain and pore compaction stage showed an exponential increase and an increasing trend, respectively, and the peak strain increased from 2.115% to 4.608%. The failure mode was basically similar in different cycles; the failure cracks extended from the corners to the middle and lower parts before the failure finally occurred. The types of failure cracks were mainly tensile cracks, followed by tensile shear cracks and the fewest compression shear cracks. The similarity and uniaxial compressive strength conformed to a good linear relationship with the number of freeze–thaw cycles, with the uniaxial compressive strength decreasing linearly with the increase in similarity.

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Section: Numerical Simulation Of Particle Flow Programsmentioning

confidence: 99%

Experimental Study on Macroscopic Mechanical Characteristics and Microscopic Pore Structure Evolution of Soil–Rock Mixture under Repeated Freeze–Thaw Cycles

Deng,

Zhao,

Xiao

et al. 2023

Applied Sciences

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“…PFC2D, which is based on the discrete element method, can be used to study the propagation of cracks in brittle rocks and rock‐like materials (eg, granite and concrete) 33,36 . In PFC2D, the material is modeled as a collection of particles (rigid circular disks).…”

Section: Discrete Element Simulationmentioning

confidence: 99%

“…rocks and rock-like materials (eg, granite and concrete). 33,36 In PFC2D, the material is modeled as a collection of particles (rigid circular disks). Each particle is in contact with the neighboring particles via contact elements.…”

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confidence: 99%

Discrete element simulation for investigating fragmentation mechanism of hard rock under ultrasonic vibration loading

Tang

Zhao

Zhou

et al. 2020

Energy Science & Engineering

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With the gradual depletion of shallow resources, the energy exploration depth has been increasing and condition becomes complex. 1 Consequently, the explorations face increasingly harder rocks with higher strengths. Breaking hard rock rapidly in petroleum and mineral exploration is a popular and significant topic. 2-6 However, the current technologies cannot meet the demands of quick drilling. It is necessary to develop a more efficient technology for hard rock exploration. To achieve this goal, the assisted ultrasonic vibration technique (ultra-high-frequency cyclic loading), combined with the traditional drilling method, was first introduced by researchers at Aberdeen University. 7 To implement this technology more effectively, studies were conducted on rock-breaking characteristics under ultrasonic vibrations and optimization of the vibration parameters. The studies conducted by Wiercigroch et al 8 showed that the high-frequency axial vibration significantly enhanced the breaking rates compared to the traditional method. Subsequently, uniaxial compressive strength experiments were conducted on fine granite by Yin et al 9 to demonstrate that there exists a static force threshold for this technology. They found that the optimal value range of static loading was 200-300 N. An

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“…erefore, various studies on rock stress are carried out by acoustic emission monitoring. Eberhardt et al [4] identified the crack initiation and propagation thresholds in brittle rock by AE monitoring; Ganne and Vervoort [5] confirmed the effect of stress path on pre-peak damage with AE method; Nejati and Ghazvinian [15] studied the brittleness effect during rock fatigue damage process by employing AE equipment; Kim et al [7] carried out a comparative evaluation of stress-strain and AE methods for quantitative damage assessments of brittle; Zhao et al [23] analyzed the rock damage characteristics based on the AE monitoring data. It is assumed that the first AE count mutation corresponds to the damage point of rock.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Initial Damage Point of Deep Granite under Step Cyclic Loading Method

Guo

2021

Advances in Civil Engineering

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In deep engineering, the initial damage point of host rock has become an important concern. Nowadays, there are many methods which can work out the initial damage point. However, each existing method introduces some significant subjective or parametric errors. In this paper, a new determination method of initial damage point employing step cyclic loading tests was designed and a series of tests were conducted on deep granite. After analyzing the peak strength and effect of cyclic loading, the turning point of initial damage was confirmed. The testing results show that the turning stress of initial damage was about 45% peak strength and will present a little decrease with the confining pressure increasing. These calculated damage points are much more scientific, accurate, and intuitive, which provides a new method for the study on rock mechanics in deep mining.

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Analysis of Rock Damage Characteristics Based on Particle Discrete Element Model

Cited by 4 publications

References 33 publications

Experimental Study on Macroscopic Mechanical Characteristics and Microscopic Pore Structure Evolution of Soil–Rock Mixture under Repeated Freeze–Thaw Cycles

Experimental Study on Macroscopic Mechanical Characteristics and Microscopic Pore Structure Evolution of Soil–Rock Mixture under Repeated Freeze–Thaw Cycles

Discrete element simulation for investigating fragmentation mechanism of hard rock under ultrasonic vibration loading

Experimental Study on Initial Damage Point of Deep Granite under Step Cyclic Loading Method

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