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Title: Direct tensile test on brittle rocks with the newly developed centering apparatus
Authors: Zhang, Qiangyong
Duan, Kang
Xiang, Wen
Yuan, Shengbo
Jiao, Yu-Yong
Keywords: DRNTU::Engineering::Civil engineering
Brittle Rock
Direct Tensile Test
Issue Date: 2017
Source: Zhang, Q., Duan, K., Xiang, W., Yuan, S., & Jiao, Y.-Y. (2018). Direct Tensile Test on Brittle Rocks with the Newly Developed Centering Apparatus. Geotechnical Testing Journal, 41(1), 92-102. doi : 10.1520/GTJ20160301
Series/Report no.: Geotechnical Testing Journal
Abstract: Failure of brittle rock normally initiates from tensile fracture due to its extraordinary lower resistance to tension rather than to compression. Intensive study on the deformability and accurate acquirement of the mechanical properties of rock under tensile stress is crucial for the stability analysis of rock slope and rock caverns. A new set of centering apparatuses, which consist of the specimen bonding part and the axial pulling part, were developed in this study. The misalignments when bonding the specimen and conducting the uniaxial tensile test can be effectively eliminated. Direct tensile tests were conducted on various brittle rocks cored from several large-scale hydropower station sites in China. The tensile strength, tensile elastic modulus, maximum tensile strain, and complete stress-strain curves were successfully obtained. The direct tensile test results indicated that the fracture surface formed in the central part of the specimen, which was under uniform tensile stress. The fracture surfaces were mostly perpendicular to the specimen axis. Fresh fractures without accumulation of rock fragments can be observed and characterized as tensile brittle failure. The microscopic failure modes of brittle rocks under the direct tensile test were not unique but consisted of the intragranular and intergranular fractures. The direct tensile strength (DTS) was generally lower than the Brazilian tensile strength (BTS) (DTS/BTS = 0.60~0.71). The direct tensile test was therefore recommended for the measurement of the tensile mechanical properties in order to ensure the safety of rock engineering.
ISSN: 0149-6115
DOI: 10.1520/GTJ20160301
Rights: © 2018 ASTM International. This paper was published in Geotechnical Testing Journal and is made available as an electronic reprint (preprint) with permission of ASTM International. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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