| Autor: |
Hegger, S., Vlachopoulos, N., Poles, T., Diederichs, M. S. |
| Předmět: |
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| Zdroj: |
Rock Mechanics & Rock Engineering; May2022, Vol. 55 Issue 5, p2615-2630, 16p |
| Abstrakt: |
The uniaxial compressive strength (UCS) test is crucial in determining the strength and stiffness behavior of intact rock and is frequently utilized by industry to determine project site characteristics. A fundamental procedure of UCS testing is strain response measurement. Conventionally, discrete strain measuring devices such as extensometers and/or electric foil strain gauges are used to measure the strain response at the mid-height of a specimen. However, this ultimately limits the ability to capture full-field strain of UCS test specimens. This has led to a gap in knowledge in terms of the complexities of UCS test strain responses caused by factors such as specimen heterogeneity and the influence of platen friction. Within this context, a novel distributed optical strain sensing (DOS) technology has been integrated with UCS testing (DOS-UCS technique). Unlike conventional discrete strain measurement methods, the optical technique captures a distributed strain profile along the length of standard, low-cost single mode optical fiber with a spatial sampling resolution of 0.65 mm. By wrapping an optical strain sensor around a UCS specimen, continuous full-field strain profiles along the length and circumference of UCS specimens can be realized. This paper presents a laboratory investigation that illustrates the potential of this technology to provide an in-depth look into the strain response of heterogeneous nodular limestone during UCS testing. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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