Mechanical Behavior of Granite with Different Grain Sizes After High-Temperature Treatment by Particle Flow Simulation

Tian, Wen‐Ling; Yang, Sheng‐Qi; Huang, Yan‐Hua; Hu, Bo

doi:10.1007/s00603-019-02005-1

Cited by 61 publications

(23 citation statements)

References 33 publications

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“…Sedimentary rocks could be divided into five basic types: clastic structure, muddy structure, authigenic particle structure, biological skeleton structure, and crystalline structure [41,42]. Figure 16 displays the microstructure characteristics of argillaceous sandstone after different high temperatures obtained by SEM and EDS tests.…”

Section: Sem and Eds Results Of Argillaceous Sandstonementioning

confidence: 99%

Effects of Temperature and Water on Mechanical Properties, Energy Dissipation, and Microstructure of Argillaceous Sandstone under Static and Dynamic Loads

Zhang

et al. 2020

Shock and Vibration

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RMT-150B rock mechanics and split Hopkinson pressure bar (SHPB) devices were adopted to investigate the physical and mechanical properties, energy dissipation, and failure modes of argillaceous sandstone after different high temperatures under air-dried and saturation states. In addition, SEM and EDS tests were conducted to investigate its microstructure characteristics. Results showed that both the P-wave velocity and density of argillaceous sandstone specimen decreased with the increase of high temperature, while its porosity increased. Compared with static stress-strain curves, there was no obvious compaction stage for dynamic stress-strain curves, and the decrease rate of dynamic curves after peak strain was obviously slow compared with static curves. Both the static and dynamic strengths of argillaceous sandstone specimens decreased with increasing temperature, and the critical temperature point for the strength of argillaceous sandstone was 400°C. At the same temperature, the specific energy absorption under air-dried state was generally smaller compared with that under saturated state. Both the strain rate and temperature showed significant effect on the failure mode. After 100∼1000°C heat treatment, the granular crystals of the clastic structure gradually became larger, and both the number and average size of the original pores decreased, resulting in the deterioration of mechanical properties of argillaceous sandstone specimen.

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Section: Sem and Eds Results Of Argillaceous Sandstonementioning

confidence: 99%

Effects of Temperature and Water on Mechanical Properties, Energy Dissipation, and Microstructure of Argillaceous Sandstone under Static and Dynamic Loads

Zhang

et al. 2020

Shock and Vibration

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“…30 In this case, we must use "trial and error" method (i.e., perform a number of tests on samples with assumed parameters and compare the results with the desired response of the real intact material). [31][32][33] When a match has been found, the corresponding set of parameters may be used in the full simulation.…”

Section: Calibrate Micro Parameters For Intact Propertiesmentioning

confidence: 99%

Three‐dimensional model reconstruction and numerical simulation of the jointed rock specimen under conventional triaxial compression

Kuang

Tian

2022

Num Anal Meth Geomechanics

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In nature, some flaws (such as fissures, joints, weak surfaces, and faults, etc.) are pre‐existed in the rock masses, which have been proved an important influence on the mechanical properties of rock masses. In this paper, a three‐dimensional (3D) joint model of a fractured specimen is built by means of the computed tomography (CT) scanning technic and digital image processing. The model shows three joints exist in the specimen: an essential joint which can be found from the specimen surface and two extra‐essential joints can only be detected from the 3D joint model. The 3D joint model is integrated into 3D particle flow code (PFC3D) to build a jointed numerical specimen and triaxial compression tests under different confining pressures are simulated. The results show that the linear phase of the stress‐strain curve is more significant under larger confining pressure. The peak strength of the jointed specimen increases linearly with the confining pressure. In addition, the peak strength of the jointed specimen shows highly consistency with the residual strength of the corresponding intact specimen. For both the intact and jointed specimen, Young's modulus increases nonlinearly with the confining pressure, and remains constant after confining pressure reaching 20 MPa.

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“…The particle flow discrete element method is a novel discontinuous medium method, which uses a series of discrete disk (2D) or spherical (3D) particles to model the rock, and to reflects the deformation and failure of rock by the relative position, motion state and bond relationship of the particles. Particle flow discrete element method has unique advantages in simulating large deformation and brittle failure of rocks under various external forces (Mehranpour et al, 2017;Castro-Filgueira et al, 2020;Tian et al, 2020) The Idaho basalt reported in the reference (Moon et al, 2012) To illustrate the influence of particle distributions on the macroscopic mechanical parameters of the model, ten simulations of uniaxial compression and tensile tests with different particle distributions (all other parameters maintain constant) are performed and the corresponding stress-strain curves are shown in Fig. 2.…”

Section: Modeling Of Uniaxial Tests For Rocksmentioning

confidence: 99%

Influence of Particle Distribution on Macroscopic Properties of Particle Flow Model

Zhang

2021

Preprint

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The particle flow discrete element models for uniaxial compression and tensile tests of rocks are established to study the influence of the particle distribution randomness on the macroscopic mechanical properties of such model. The results of macroscopic mechanical properties show strong discreteness due to the variance of particle distributions, in which compressive strength, tensile strength and Poisson's ratio follow the normal distribution and the Young's modulus follows the negative skewness distribution. The average values of the macroscopic strength obtained based on multiple calculations with different particle distributions should be used for the calibration of microscopic parameters. According to the relationship between sample size and deviation of macro strength averages, the minimum calculation number required to obtain high-precision macro strength with different confidence levels is given.

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Mechanical Behavior of Granite with Different Grain Sizes After High-Temperature Treatment by Particle Flow Simulation

Cited by 61 publications

References 33 publications

Effects of Temperature and Water on Mechanical Properties, Energy Dissipation, and Microstructure of Argillaceous Sandstone under Static and Dynamic Loads

Effects of Temperature and Water on Mechanical Properties, Energy Dissipation, and Microstructure of Argillaceous Sandstone under Static and Dynamic Loads

Three‐dimensional model reconstruction and numerical simulation of the jointed rock specimen under conventional triaxial compression

Influence of Particle Distribution on Macroscopic Properties of Particle Flow Model

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