High-strength model material production for structural plane replica and its shear testing

Liu, Changjiang; Zhang, Yu; Zheng, Luobing; Pan, Kai; Tan, Xiaodong

doi:10.1007/s12205-017-0636-4

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…Three samples were created for each number of cracks. The graph confirms that for a given number of cracks, the three samples exhibit a very similar breaking load, meaning that the relationship between the number of cracks and breaking load can be reliably obtained (Haeri et al 2015) to recent attempts to overcome these problems using this technology (Bourke et al 2008;Jiang and Zhao 2015;Tian and Han 2017a;Ji et al 2018;Kong et al 2018a;Sharafisafa et al 2018;Squelch 2018;Zhou and Zhu 2018;Zhu et al 2018a). The remainder of this article will therefore be a review of additive manufacturing to the investigation of rock mechanics.…”

Section: Artificial Rock Materialssupporting

confidence: 53%

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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Section: Artificial Rock Materialssupporting

confidence: 53%

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

2019

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“…Without distinguishing the difference between specimens, the shear strength parameters obtained by directly fitting the data can neither faithfully reflect the effect of normal stress on the shear strength nor can faithfully reflect the shear strength of a group of specimens even if the value of R 2 is high. Nevertheless, shear test under varying normal stresses provides a considerable amount of useful information that should be fully analyzed and applied [14,15]. As such, developing a suitable analysis method to obtain shear strength parameters that can better re ect the shear characteristics of the rock mass joint surface is of paramount importance.…”

Section: Conventional Multiple-specimen Methods Formentioning

confidence: 99%

“…For example, by the study of Shang et al [14], even for some rock joints with the same areal persistence, the measured shear strength is still different. At the same time, Ji et al [15] found it is different to remove the effect of surface irregularity from the test results.…”

Section: Introductionmentioning

confidence: 99%

Optimized Analysis Method for Evaluating the Shear Strength Parameters of Rock Joint Surfaces

Xiao

Deng

Fang

et al. 2020

Advances in Civil Engineering

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The results obtained from the mechanical test of rock samples inevitably suffer dispersion owing to discrepancies between test specimens. In view of these deficiencies, the present study proposes a method based on the empirical equation of shear strength developed by Barton to determine the shear strength parameters of joint surfaces using a single test specimen. This approach is then applied to optimize the analysis of multiple specimens. An analysis of experimental results verifies that the shear strength parameters of joint surfaces obtained by the proposed method can more accurately reflect the shear mechanics of multiple specimens than conventional multiple sample analyses; meanwhile, the results are reasonable and reliable. More importantly, the optimized method ensures the shear strength parameters are no longer affected by the sequence of specimens employed during shear test. The optimized analysis method eliminates the effect of differences between specimens and the influence of subjective factors on test results and therefore provides more realistic evaluations of shear strength parameters.

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“…Therefore, in recent years, a large number of scholars have carried out shear tests and constitutive model studies on rock structural planes. In terms of experiments, Xiong Z. et al [6] and Ji F. et al [7] used 3D printing and fast scanning technology to produce structural plane models to solve the problem that rock structural planes could not be produced in batches, and conducted shear test research; Xing W. et al [8] used the gypsum mold expansion method to produce rock splitting structural plane. Through indoor direct shear tests, the variation law of shear stress of structural planes, with morphology characteristics, normal stress, and material strength, was studied.…”

Section: Introductionmentioning

confidence: 99%

Statistical Damage Model of Rock Structural Plane Considering Void Compaction and Failure Modes

Zhang

et al. 2022

Symmetry

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The shear behavior of rock structural planes contains various symmetry laws, and the shear failure can be considered as an asymmetric state of the rock and rock mass. The study of shear deformation and the failure of rock structural planes plays a vital role in ensuring the safety and stability of engineered rock masses. In view of the inability of traditional shear constitutive models to describe the non-linear characteristics of the dilatancy stage and the single applicable failure form, firstly, we discuss, in depth, the law and mechanism of shear deformation and failure of structural planes, and introduce the compaction index α to measure the non-linear characteristics of shear stress–shear displacement caused by compaction of microcracks and internal pores of structural planes, and the structural plane damage model, considering the void compaction and failure mode, was established. Then, the statistical damage theory was introduced, and the strength and failure of the microunits of the rock structural plane were assumed to obey the Weibull distribution. Based on the Mohr-Coulomb strength criterion to measure the strength of the microunits of the rock structure surface, a statistical damage model of structural planes, which can describe void compaction and failure modes, was established. Finally, a comparative analysis was carried out with the test curve, and the results showed that: the calculation curve of the structural plane statistical damage model established, considering the void compaction and failure modes, has the same trend as the structural plane shear test curve, which can better describe the shear stress– shear displacement at the dilatancy stage, as well as the shearing stage and sliding stage in different failure modes. The changing law of shear displacement reflects the rationality and accuracy of the constructed constitutive model. The research results can provide a theoretical basis for the shear deformation and failure of rock structural planes.

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High-strength model material production for structural plane replica and its shear testing

Cited by 5 publications

References 8 publications

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

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

Optimized Analysis Method for Evaluating the Shear Strength Parameters of Rock Joint Surfaces

Statistical Damage Model of Rock Structural Plane Considering Void Compaction and Failure Modes

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