Size-dependent Behaviour of Weak Intact Rocks

Zhai, Hao; Masoumi, Hossein; Zoorabadi, Mahdi; Canbulat, Ismet

doi:10.1007/s00603-020-02117-z

Cited by 31 publications

(10 citation statements)

References 29 publications

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“…The size of the standard sample differs from that of the test sample, so is the strength. The scale effect of rock-like materials was used to estimate the UCS of the test sample based on that of the standard sample [87][88][89][90][91][92][93].…”

Section: Detection Results Of Vibration Frequency Of Steel Barmentioning

confidence: 99%

“…Zhai et al [90] extended Eq. ( 20) from rock limited samples to rock-like materials such as cement mortar, and obtained the corresponding relationship between UCS and the diameter of the rock-like material by fitting the experimental data.…”

Section: Detection Results Of Vibration Frequency Of Steel Barmentioning

confidence: 99%

“…The cross section of the frequency test sample used in this study is a square with a side length of 400 mm, so the corresponding equivalent diameter is about 450 mm [95][96]. According to the research of Zhai et al [90], the strengths of the sample with a diameter of 450 mm (UCS450) and 50 mm (UCS50) satisfies the following formula, 21), the correspondence between the vibration frequency of the steel bar and the strength of the frequency test samples accounted for the scale effect can be obtained, and is shown in Fig. 19b.…”

Section: Detection Results Of Vibration Frequency Of Steel Barmentioning

confidence: 99%

See 2 more Smart Citations

New non-destructive method for testing the strength of cement mortar material based on vibration frequency of steel bar: Theory and experiment

Shi

Song

Chen

et al. 2020

Construction and Building Materials

View full text Add to dashboard Cite

Section: Detection Results Of Vibration Frequency Of Steel Barmentioning

confidence: 99%

Section: Detection Results Of Vibration Frequency Of Steel Barmentioning

confidence: 99%

Section: Detection Results Of Vibration Frequency Of Steel Barmentioning

confidence: 99%

See 1 more Smart Citation

New non-destructive method for testing the strength of cement mortar material based on vibration frequency of steel bar: Theory and experiment

Shi

Song

Chen

et al. 2020

Construction and Building Materials

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“…Therefore, the size effect of rock and the variability of rock mass must be considered when selecting and applying the physical and mechanical properties of rock. For this reason, domestic and foreign scholars have done a lot of physical experiments 1 – 5 , numerical simulation experiments 6 – 8 and theoretical research 9 – 11 , and gradually have a deep understanding of this problem.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of size effect of defective rock under compression condition

Xie

Qin

et al. 2023

Sci Rep

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The existence of various types of damage, small cracks, some large voids and the size of the sample in the rock will make the experimental results show great discreteness. In this paper, based on the results of laboratory experiments, a numerical model of large flawed rock samples is established by using particle flow software PFC2D, and the mechanical response of rocks with different length-diameter ratios and different flaw positions in uniaxial compression experiments is discussed. The results show that the specimen size has a significant effect on the crack characteristics, mechanical characteristics and energy characteristics of rock mass. From the perspective of energy and crack characteristics, the total number of cracks after the failure of the defective rock sample is slightly lower than that of the intact rock sample, resulting in a slightly lower peak strain energy during the rock failure process. From the mechanical properties of rock samples, the Poisson’s ratio of intact rock samples is slightly smaller than that of defective rock samples. The strength of the defective sample is weakened relative to the complete rock sample, and the relationship formula between the weakening range and the aspect ratio is obtained through analysis. Moreover, different defect locations lead to different crack processes and crack modes, resulting in different uniaxial compressive strength.

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“…For example, the UCS of rocks with large porosity, such as Hawkesbury sandstone and dissolved tuff, increases as the sample diameter increases (Pells 2004;Yuki et al 1995). The sandstone and granite show a progression (increasing and then decreasing) of the UCS as the specimen size increases (Hawkins 1998;Masoumi et al 2016;Quiñones et al 2017;Zhai et al 2020). Uniaxial compression experiments conducted by Thuro found no significant size effects on the UCS and elastic modulus of limestone and granite (Thuro et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Size effects in the uniaxial compressive properties of 3D printed models of rocks: an experimental investigation

Han

et al. 2022

Int J Coal Sci Technol

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Transparent physical models of real rocks fabricated using three-dimensional (3D) printing technology are used in photoelastic experiments to quantify the evolution of the internal stress and deformation fields of rocks. Therefore, they are rendered as an emerging powerful technique to quantitatively reveal the intrinsic mechanisms of rock failure. The mechanical behavior of natural rocks exhibits a significant size effect; however, limited research has been conducted on whether transparent physical models observe similar size effects. In this study, to make the transparent printed models accurately demonstrate the mechanical behavior of natural rocks and reveal the internal mechanism of the size effect in rock mechanical behavior, the size effect in 3D printed models of fractured and porous rocks under uniaxial compressive loading was investigated. Transparent cylindrical models with different sizes that contained different fractured and porous structures were printed using the fracture and porous characteristics extracted from natural coal and sandstone. The variation in uniaxial compressive strength and elastic modulus of fractured and porous models for increasing model sizes were obtained through uniaxial compression experiments. Finally, the influence of internal discontinuous structural features, such as fractures and pores, on the size effect pertaining to the mechanical behavior of the model was analyzed and elaborated by comparing it with the mechanical properties of the continuous homogeneous model without fractures and pores. The findings provided support and reference to analyze the size effect of rock mechanical behavior and the effect of the internal discontinuous structure using 3D printed transparent models.

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Size-dependent Behaviour of Weak Intact Rocks

Cited by 31 publications

References 29 publications

New non-destructive method for testing the strength of cement mortar material based on vibration frequency of steel bar: Theory and experiment

New non-destructive method for testing the strength of cement mortar material based on vibration frequency of steel bar: Theory and experiment

Numerical simulation of size effect of defective rock under compression condition

Size effects in the uniaxial compressive properties of 3D printed models of rocks: an experimental investigation

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