Deformation and failure characteristics of sandstone under uniaxial compression using distributed fi

• 作 者: Lingfan Zhang Duoxing Yang Zhonghui Chen Aichun Liu
• 机 构: Institute of Crustal Dynamics, China Earthquake Administration, Beijing, 100085, China“,”College of
• 出 处: 岩石力学与岩土工程学报（英文版）
• 发表日期: 2020年5期
• 关键词: Distributed fiber optic strain sensing (DFOSS) Uniaxial compression Strain local

This paper investigates the deformation and fracture propagation of sandstone specimen under uniaxial compression using the distributed fiber optic strain sensing (DFOSS) technology. It shows that the DFOSS-based circumferential strains are in agreement with the data monitored with the traditional strain gage. The DFOSS successfully scans the full-field view of axial and circumferential strains on the specimen surface. The spatiotemporal strain measurement based on DFOSS manifests crack closure and elastoplastic deformation, detects initialization of microcrack nucleation, and identifies strain localiza-tion within the specimen. The DFOSS well observes the effects of rock heterogeneity on rock deforma-tion. The advantage of DFOSS-based strain acquisition includes the high spatiotemporal resolution of signals and the ability of full-surface strain scanning. The introduction to the DFOSS technology yields a better understanding of the rock damage process under uniaxial compression.