Study on Strain Characterization and Failure Location of Rock Fracture Process Using Distributed Optical Fiber under Uniaxial Compression
| Autor: | Sun Binyang, Duoxing Yang, Shuangming Wang, Xu Shiang, Zhang Pingsong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Optical fiber
Materials science distributed optical fiber 0211 other engineering and technologies 02 engineering and technology 010502 geochemistry & geophysics lcsh:Chemical technology 01 natural sciences Biochemistry Article Analytical Chemistry law.invention strain observation law Rock mechanics lcsh:TP1-1185 Electrical and Electronic Engineering Composite material Rock mass classification Instrumentation 021101 geological & geomatics engineering 0105 earth and related environmental sciences Strain (chemistry) uniaxial compression rock fracture Gauge (firearms) Atomic and Molecular Physics and Optics Fiber optic sensor Fracture (geology) Deformation (engineering) |
| Zdroj: | Sensors, Vol 20, Iss 3853, p 3853 (2020) Sensors Volume 20 Issue 14 Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| Popis: | A rock fracture test is a very important method in the study of rock mechanics. Based on the Mechanics Test System (MTS) mechanical test system, the dynamic strain response of the failure process of cylindrical granite specimens under uniaxial compression was observed by using distributed optical fiber strain sensors. Two groups of tests were designed and studied for rock sample fracturing. The main comparison and analysis were made between the distributed optical fiber testing technology and the MTS testing system in terms of the circumferential strain response curve and the evolution characteristics of strain with time. The strain characterization of distributed optical fiber in the process of rock fracturing was obtained. The results show that the ring strains measured by the distributed optical fiber sensor and the circumferential strain gauge were consistent, with a minimum ring strain error of 1.27%. The relationship between the strain jump or gradient band of the distributed optical fiber and the crack space on the sample surface is clear, which can reasonably determine the time of crack initiation and propagation, point out the location of the rock failure area, and provide precursory information about rock fracture. The distributed optical fiber strain sensor can realize the linear and continuous measurement of rock mass deformation, which can provide some reference for the study of macro damage evolution and the fracture instability prediction of field engineering rock mass. |
| Databáze: | OpenAIRE |
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