Mechanical properties of rock specimens containing pre‐existing flaws with 3<scp>D</scp> printed materials

Tian, Wei; Han, Nv

doi:10.1111/str.12240

Cited by 39 publications

(15 citation statements)

References 15 publications

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“…So far, there have been many studies on the mechanical properties of joints. For example, some researchers (Malama and Kulatilake, 2003;Zhou et al, 2013;Yang et al, 2014Yang et al, , 2016Liu and Zhang, 2015;Tian and Han, 2017) have studied the static uniaxial compression behavior of the rock samples with a single fracture, two intersecting joints or a parallel of non-persistent fissures, and have obtained the compression strength and deformation characteristics of these jointed rock samples. Many researches (e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Chai

Wang

et al. 2020

Lat. Am. j. solids struct.

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The static and dynamic compression mechanical properties of the prefabricated artificial filled rock joints specimens with different fillings and different joint thicknesses are tested, respectively. Then, the strength, deformation, wave propagation and energy dissipation laws of the filled joints are analyzed. The experimental results show that the static and dynamic compression strength of filled joints increases with the strength of filling materials while decreases with the filling thickness. The deformation characteristics of filled joints under static and dynamic compression are positively correlated with the properties of filling materials and the thickness of filled joints. With the increasing of the filling thickness, the reflection coefficient increases while the transmission coefficient decreases. With the increase of the strength of the fillings, the reflection coefficient decreases while the transmission coefficient increases. The energy dissipation ratio decreases with the increase of the filliing thickness and increases with the increase of the strength of the filling material.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Chai

Wang

et al. 2020

Lat. Am. j. solids struct.

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“…A final important factor when investigating the usefulness of a given 3D printing technique is the minimum resolution at which the samples can be printed, as this determines whether the rock microstructure can be recreated down to Fig. 9 Comparison of failure of rock and 3D-printed rock simulants (Tian and Han 2017b) the scale of the grains. The resolution must be considered in all three dimensions, the x and y axes being in the plane of the layers and the z axis being normal to the layers.…”

Section: Print Resolutionmentioning

confidence: 99%

Review of the Validity of the Use of Artificial Specimens for Characterizing the Mechanical Properties of Rocks

2019

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The field of rock mechanics is concerned with the response of rocks to the forces acting on them, characterizing this behaviour in specific environments and under varying loading conditions. This review discusses the suitability of current mechanical testing methods for inhomogeneous rock bodies, with a specific focus on the use of artificial samples in place of real rocks in these tests. The use of artificial materials such as cement, resins, and sand-based mixtures is reviewed, as is the manufacture of three-dimensionally printed samples. The benefits and drawbacks of using such specimens in mechanical tests, and the validity of their simulation of real rock are discussed. There is evidence that 3D-printed samples have the advantage of overcoming the problems of specimen reproducibility and also make possible the ability to test the response of specific defects to loading. There is thus great potential for the use of 3D printing in this field. However, the review concludes that further post-processing and careful thought about the materials used must be carried out to ensure that printed samples are of adequate strength and brittleness to accurately simulate real rocks.

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“…Furthermore, with the development of science and technology, novel testing techniques have been used to study the fracture characteristics of rocks, such as the use of scanning electron microscopes (SEM) [13], 3D-printing technology [14], computerized tomography (CT) [15], and acoustic emission (AE) monitoring technology [16][17][18]. The failure process of rock demonstrates a self-organized critical behavior [19,20]: a large number of microfractures (avalanches) are generated from disordered distribution to centralized distribution, which eventually leads to macrocrack propagation until rock failure occurs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Anisotropic Behavior and Statistical Evolution of Acoustic Emission Energy during the Deformation of Layered Sandstone

Cai

Wang

et al. 2022

Geofluids

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To further understand the anisotropic behavior of layered rock and the precursor characteristics of rock mass instability, a series of uniaxial compression experiments using a loading system and an acoustic emission system was conducted on sandstone specimens. The influence of bedding on the mechanical parameters and failure modes and the statistical evolution of the acoustic emission energy were successively discussed. The results of axial stress-strain curves and crack propagation modes showed that the existence of a bedding plane increased the anisotropy of the rocks, and the magnitude of the bedding inclination also exerted certain influence on this anisotropy. Furthermore, we used the least squares method and the maximum likelihood method to analyze the b value and power-law exponent, respectively. The results of statistical evolution of acoustic emission energy showed that the b value, the effective power-law exponent, and the optimal exponent could be used as monitoring indexes for the rock mass stability. With the progress of the experiment, the following phenomena pertaining to acoustic emission activities occurred, which may indicate imminent danger of collapse: (1) the crackling noises increased significantly; (2) the variation of the b value exhibited a significant downward trend; and (3) the effective power-law exponent and the optimal exponent changed in different stages and gradually decreased as the final failure was approached. The findings in this paper may provide a theoretical basis for predicting the collapse and instability of rock mass structures.

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Mechanical properties of rock specimens containing pre‐existing flaws with 3D printed materials

Cited by 39 publications

References 15 publications

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Review of the Validity of the Use of Artificial Specimens for Characterizing the Mechanical Properties of Rocks

Investigation of Anisotropic Behavior and Statistical Evolution of Acoustic Emission Energy during the Deformation of Layered Sandstone

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