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Rock Mechanics and Rock Engineering

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10.10.2023 | Original Paper

The Applicability of Brazilian Test Loading with Different Platens to Measure Tensile Strength of Rock: A Numerical Study

verfasst von: Xiao-Ping Zhang, Pei-Yuan Zhang, Pei-Qi Ji, Han Zhang, Qi Zhang

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 1/2024

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Abstract

The Brazilian test is extensively used to indirectly measure the tensile strength of rock. However, the Brazilian tensile strength (BTS) does not always align with the direct tensile strength (DTS), resulting in a lack of consensus regarding the applicability of Brazilian test across diverse rock types. To evaluate the applicability of Brazilian test loading with various platens, the different numerical tensile tests based on the discrete element procedure PFC^2D were conducted. The simulation results indicate that the discrepancy between the BTS and DTS of rock is heavily influenced by the rock’s uniaxial compressive strength (UCS) to direct tensile strength (DTS) ratio. Specifically, the DTS/BTS ratio exhibits a strong negative correlation with the UCS/DTS. This negative correlation holds true across the usage of different loading platens in the Brazilian test. Moreover, the simulation results indicate that the process of crack initiation and propagation of specimens in Brazilian test is closely related to the relative relationship between the BTS and DTS. The UCS/DTS ratio of rock and the selection of the loading platen simultaneously affect the process of crack initiation and propagation. Specimens with a low UCS/DTS ratio tend to crack from the loading ends inward under concentrated end loading, such as flat platen and curved jaws. In this scenario, the BTS often underestimates the rock’s tensile strength. If the UCS/DTS ratio of a specimen is sufficiently high, cracking does not originate from the end, but rather from discrete microcracks in the internal tensile stress zone. These microcracks then propagate towards the loading end, leading to failure. Under these conditions, the BTS typically overestimates the tensile strength. Utilizing platforms with a central angle of 20°can mitigate stress concentration at the loading end in Brazilian tests, prompting internal crack initiation. However, the resulting BTS is also more likely to overestimate the tensile strength. Therefore, selecting an appropriate loading platen based on the rock's UCS/DTS ratio is crucial to minimize the difference between the BTS and DTS. The proper range of UCS/DTS ratios of rock for the Brazilian test with flat platen, curved jaws and loading platforms are recommended as 10–15, 8–10 and 5–8, respectively.

Vorheriger Artikel Stability of Carbonate Rocks Containing Acid Wormholes Under High Confining Pressures

Nächster Artikel Dynamic Behavior of Ungrouted and Grouted Rocks of Different Morphologies Containing a Flaw Subjected to Different Thermal Treatments

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Titel: The Applicability of Brazilian Test Loading with Different Platens to Measure Tensile Strength of Rock: A Numerical Study
verfasst von: Xiao-Ping Zhang
Pei-Yuan Zhang
Pei-Qi Ji
Han Zhang
Qi Zhang
Publikationsdatum: 10.10.2023
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 1/2024
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-023-03566-y

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