Mechanical Properties and Energy Characteristics of Flawed Samples with Two Non-Parallel Flaws under Uniaxial Compression

Qun Li, Changfu Huang, Yanbo Zhang, Peng Liang (), Xulong Yao and Guangyuan Yu
Additional contact information
Qun Li: College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China
Changfu Huang: China Railway 15th Bureau Group Co., Ltd., Shanghai 200070, China
Yanbo Zhang: College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China
Peng Liang: College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China
Xulong Yao: College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China
Guangyuan Yu: College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China

Sustainability, 2022, vol. 15, issue 1, 1-15

Abstract: Unequal flaws are widespread in rock engineering, in which the extensions induced by excavation and unloading are the main factors leading to engineering instability. Rock deformation and failure are essentially the results of energy transmission. In order to study the influence of flaw type and angle on the mechanical properties and energy characteristics of the flawed rock mass, uniaxial compression tests were conducted using particle flow numerical analysis software. The results show that the crack initiation strength and peak strength of the sample increase with the increase in the flaw angle. For smaller flaw angles, the sample shows obvious plastic deformation during uniaxial compression. For larger flaw angles, the sample shows elastic–brittle properties, whose storage energy is larger. The peak strength of samples with flaws of unequal length presents an obvious decrease compared with that of flawed samples with flaws of equal length, and the extent of the reduction is 6.15% on average. Unequal flaws decrease the ability of the flawed sample to absorb strain energy. Compared with flawed samples with equal flaws, flawed samples with unequal flaws decrease the boundary energy and elastic strain energy by 9.29% and 9.95% on average, respectively. Flaws of unequal length in this sample can weaken the performance of the flawed sample.

Keywords: rock mechanics; flawed rock mass; non-parallel flaws; energy characteristics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/15/1/459/pdf (application/pdf)
https://www.mdpi.com/2071-1050/15/1/459/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2022:i:1:p:459-:d:1016876

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().