Experimental and numerical investigation on the effects of bedding plane properties on the mechanical and acoustic emission characteristics of sandy mudstone

Meng, Yaoyao; Jing, Hongwen; Liu, Xiaowei; Yin, Qian; Wei, Xingchen

doi:10.1016/j.engfracmech.2021.107582

Cited by 59 publications

(15 citation statements)

References 35 publications

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“…According to the acoustic emission count (cumulative count) and energy (cumulative energy) in the process of rock failure, we studied the degree of occurrence and development of cracks in the rock to through failure and the intensity of accompanying acoustic emission events (Guo and Wong, 2020;Jiang et al, 2020;Meng et al, 2021). Here, we list the test results of 60 °bedding specimens as an example.…”

Section: Characteristics Of Acoustic Emission During Rock Sample Fail...mentioning

confidence: 99%

Energy Evolution and Acoustic Emission Characteristics of Uniaxial Compression Failure of Anchored Layered Sandstone

Zhao

Feng

et al. 2022

Front. Earth Sci.

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To study the energy evolution and acoustic emission characteristics of layered sandstone under anchorage in the process of deformation and failure, the sandstone samples from Chuxiong Yi Autonomous Prefecture, Yunnan Province were selected for uniaxial compression testing. The energy evolution in the process of sandstone failure and the spatial fractal characteristics of acoustic emission events in the process of deformation and failure were investigated. Research results show that anchoring can make layered sandstone store more energy, the stored energy first increases, then decreases with the increase of bedding angle; the B value of sandstone under anchorage is generally higher than that of unanchored sandstone in the whole deformation and failure process, and the continuous decline in B value can be used to indicate a precursor to instability and failure; under the action of anchoring, the D value of sandstone (its fractal dimension) also increases, then decreases with the increase of bedding angle. The D value changes within [2, 3]. At a given bedding angle, the D value of anchored sandstone is greater than that of unanchored sandstone, the D value of 30° anchored sandstone increased the most (by 12.33%); the maximum D value occurred in 45° anchored sandstone (reaching 2.72) and the spatial distribution of acoustic emission events and damage of sandstone under anchorage is also more uniform; under increasing stress, the number of acoustic emission events is less widely distributed in the early stage and more densely distributed in the later stage. The growth rate of the D value varies across different peak stress ranges, which is more significant under the action of anchorage. The acoustic emission event counts grow evenly and slowly in the space, and the toughness of sandstone is improved to a certain extent under the action of anchorage.

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Section: Characteristics Of Acoustic Emission During Rock Sample Fail...mentioning

confidence: 99%

Energy Evolution and Acoustic Emission Characteristics of Uniaxial Compression Failure of Anchored Layered Sandstone

Zhao

Feng

et al. 2022

Front. Earth Sci.

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“…Related study results show that there is a certain of differences in the evolution law of the fundamental mechanical parameters of bedded coal and rock with the change in the bedding angle, and the difference is mainly attributed to the lithology effect. 41,42,[45][46][47] The elastic modulus and the uniaxial compressive strength of bedded coal and rock mainly exhibit V-shaped evolution law with the change in the bedding angle, and the reason for different evolution types lies in the different positions of minimum values (see Figure 8A,C). 42,46 However, the elastic modulus and the uniaxial compressive strength of bedded coal and rock also have other evolution laws with the change in the bedding angle, which both increase with the increasing of the bedding angle (see Figure 8A-and D-).…”

Section: Mechanical Parametersmentioning

confidence: 99%

“…41,42,[45][46][47] The elastic modulus and the uniaxial compressive strength of bedded coal and rock mainly exhibit V-shaped evolution law with the change in the bedding angle, and the reason for different evolution types lies in the different positions of minimum values (see Figure 8A,C). 42,46 However, the elastic modulus and the uniaxial compressive strength of bedded coal and rock also have other evolution laws with the change in the bedding angle, which both increase with the increasing of the bedding angle (see Figure 8A-and D-). 47,48 Additionally, the uniaxial compressive strength of bedded coal and rock shows a W-shaped evolution law with the increasing of the bedding angle, and the reason for the different evolution types lies in the different location of "valley bottom" (see Figure 8B).…”

Section: Mechanical Parametersmentioning

confidence: 99%

“…The evolution law of the fundamental mechanical parameters of bedded coal and rock and its precision acquisition for the numerical simulation verification and the field practice of underground engineering can provide important parameter and reliable theoretical basis. However, the cost is too large, the workload is too heavy, and it is not realistic in the 41,42,[45][46][47][48][49][50][51] Note: E-Young's modulus, (GPa); μ-Poisson's ratio; σ UCS -Uniaxial compression strength, (MPa); σ t -Uniaxial tensile strength, (MPa); β-Bedding angle, (°); DTT-Direct tensile test; BITT-Brazilian indirect tension test actual operation for the fundamental mechanical parameters of bedded coal and rock quantified accurately widely obtained.…”

Section: Mechanical Parametersmentioning

confidence: 99%

“…Evolution law of fundamental mechanical parameters with β : (A) E ; (B) μ ; (C) σ UCS ; (D) σ t 41,42,45‐51 . Note : E —Young's modulus, (GPa); μ—Poisson's ratio; σ UCS —Uniaxial compression strength, (MPa); σ t —Uniaxial tensile strength, (MPa); β —Bedding angle, (°); DTT—Direct tensile test; BITT—Brazilian indirect tension test…”

Section: Fundamental Mechanical Parametersmentioning

confidence: 99%

See 2 more Smart Citations

The permeability properties of bedded coal and rock: Review and new insights

Song

Zhang

et al. 2022

Energy Science & Engineering

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It is beneficial to understand deeply the permeability properties of coal and rock for the stability control of mining engineering, underground engineering, oil and gas engineering, nuclear waste storage engineering, and so on. Therefore, new insights for the permeability properties of bedded coal and rock are summarized and proposed. (1) "Five guarantees" coring technology is worth for vigorous promotion and application. (2) The internal spatial fabric has the significant effect on the mechanical behavior evolution law of (bedded) coal and rock, but the effect is not dominant. (3) The permeability‐energy evolution models of (bedded) coal and rock should be constructed considering the idea of initial high in situ stress reduction, which is helpful for the energy visualization characterization of (bedded) coal and rock. Meanwhile, it can be combined with the structural evolution theory for in‐depth characterization and disclosure. (4) Researches on the permeability properties of (bedded) coal and rock under multi‐field or multi‐phase or phase‐field coupling conditions should be strengthened based on considering the initial damage produced and the distribution characteristics of in situ stress under the coring environment. (5) More accurate and scientific permeability evolution models of (bedded) coal and rock should be vigorously constructed based on the above insights.

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Numerical investigation on the effect of intergranular contact bonding strength on the mechanical properties of granite using PFC3D‐GBM

Peng

Zhang

et al. 2023

Num Anal Meth Geomechanics

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In rock materials, the intergranular structure is more affected by various external conditions than the transgranular structure, and then dominates the macroscopic mechanical properties of rocks. In this paper, an innovative three‐dimensional grain‐based model based on Particle Flow Code (PFC3D‐GBM) for reproducing granite crystalline structures was developed. Based on this model, the Brazilian splitting test was conducted to investigate the effects of intergranular contact (IC) bonding strength on the mechanical properties and micro‐cracking behavior of the granite. Additionally, in this paper, the force chains and the orientation distribution of the force chains are shown in the form of three‐dimensional rose diagrams. The results are compared to the numerical results obtained by an initial particle‐based model to demonstrate the superiority of the proposed PFC3D‐GBM. The results indicate that the stress–strain curve of the sample in the Brazilian splitting test can be classified into four distinct stages: initial compaction, linear elasticity, damage, and splitting failure. ICs fracture at a higher rate than transgranular contacts (TCs) under static loading, as evidenced by experimental results of laboratory tests; during the entire loading process, all force chains uniformly distribute in all directions of a sample. As the external load increases, the number of total force chains decreases and the number of cracks increases. The main orientation of the high‐strength force chains is consistent with the external loading direction and is vertical with respect to the main orientation of the cracks. Furthermore, the number of high‐strength force chains increases with the level of external load. The sample's failure mechanism in the Brazilian splitting test is always a tensile failure, and this characteristic is unaffected by the modeling method or the IC bonding strength. Both the tensile strength and peak strain increase as the IC bonding strength increases. In this process, the number of total cracks in PFC3D‐GBM decreases, the proportion of transgranular cracks (Tcs) increases, and the proportion of intergranular cracks (Ics) decreases. The micro‐cracking behavior described above based on the PFC3D‐GBM can be explained more rationally. As the bonding strength of the IC increases, the particles involved in sample deformation are subjected to a greater stress concentration prior to the sample experiencing macro‐fracture, leading to an increase in the number of high‐strength force chains, which is the fundamental reason for the increase of the sample's tensile strength.

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Experimental and numerical investigation on the effects of bedding plane properties on the mechanical and acoustic emission characteristics of sandy mudstone

Cited by 59 publications

References 35 publications

Energy Evolution and Acoustic Emission Characteristics of Uniaxial Compression Failure of Anchored Layered Sandstone

Energy Evolution and Acoustic Emission Characteristics of Uniaxial Compression Failure of Anchored Layered Sandstone

The permeability properties of bedded coal and rock: Review and new insights

Numerical investigation on the effect of intergranular contact bonding strength on the mechanical properties of granite using PFC3D‐GBM

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