JRMGE / Vol 16 / Issue 12

Article

Anisotropic characteristics and creep model for thin-layered rock under true triaxial compression

Tianxiang Song, Xia-Ting Feng, Yangyi Zhou, Chengxiang Yang, Xiaojun Yu

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a Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, School of Resources and Civil Engineering, Northeastern University,
Shenyang, 110819, China
b Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology, Northeastern University, Shenyang, 110819, China


2024, 16(12): 4815-4834. doi:10.1016/j.jrmge.2024.02.018


Received: 2023-09-13 / Revised: 2024-01-17 / Accepted: 2024-02-29 / Available online: 2024-05-20

2024, 16(12): 4815-4834.

doi:10.1016/j.jrmge.2024.02.018


Received: 2023-09-13

Revised: 2024-01-17

Accepted: 2024-02-29

Available online: 2024-05-20


Abstract:

The failure phenomenon of thin-layered rock tunnels not only exhibits asymmetric spatial characteristics, but also significant time-dependent characteristics under high in-situ stress, which is attributed to the time-dependent fracture of thin-layered rocks. This paper conducted a series of true triaxial creep compression tests on typical thin-layered rock siliceous slate with acoustic emission technique to reveal its anisotropic time-dependent fracture characteristics. The anisotropic long-term strength, creep fracturing process, and fracture orientation characteristics of thin-layered rocks under different loading angles (β, ω) and intermediate principal stress were summarized. A three-dimensional (3D) non-linear visco-plastic creep model for thin-layered rock was developed to simulate its anisotropic creep behavior. The time-dependent fracturing of rocks during true triaxial creep loading is reflected through the change of equivalent strain based on an improved Euler iteration method. By constructing the plastic potential function and overstress index related to loading angles and stress state, the anisotropic time-dependent fracturing process and propagation of thin-layered rocks under different loading angles and intermediate principal stress are expounded. The model was validated experimentally to show it can reflect the long-term strength and creep deformation characteristics of thin-layered rocks under true triaxial compression.

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Keywords: Inherent anisotropic rock, Creep failure, True triaxial compression, Three-dimensional creep model

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Tianxiang Song, Xia-Ting Feng, Yangyi Zhou, Chengxiang Yang, Xiaojun Yu, 2024. Anisotropic characteristics and creep model for thin-layered rock under true triaxial compression. J. Rock Mech. Geotech. Eng. 16 (12), 4815-4834.

Author(s) Information

Prof.  Xia-Ting Feng
xtfeng@whrsm.ac.cn
fengxiating@mail.neu.edu.cn

Prof. Xia-Ting Feng received his PhD degree at Northeastern University of Technology (now Northeastern University since 1993), China in 1992 and then took the position of lecturer, associate professor and professor at the same university. He joined Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (CAS) in 1998 as a Professor of Hundred Talent Program of the CAS and as Deputy Director in Charge and Director in 2001–2005. He has worked as Director of State Key Laboratory of Geomechanics and Geotechnical Engineering since 2007. He works at Northeastern University, China as a Vice President since September 2017. In February 2021, he became president of Northeastern University. He is President of Federation of International Geo-engineering Societies−FedIGS, President of International Society for Rock Mechanics (ISRM) Commission on Design Methodology, member of ISRM Commission on Testing Methods, and President of Chinese Society for Rock Mechanics and Engineering (CSRME). He was the past President of ISRM 2011–2015. He is also Editor-in-Chief of Journal of Rock Mechanics and Geotechnical Engineering (JRMGE), and Associate Editor-in-Chief of Chinese Journal of Theoretical and Applied Mechanics. He is member of Editorial Board of Rock Mechanics and Rock Engineering. His research interests cover rock mechanics for deep rock engineering. He published more than 200 technical papers and the English books “Rock engineering design” and “Rock engineering risk” with Professor John Hudson. He has edited five volumes of the book “Rock mechanics and rock engineering” (CRC Press) and the book “Rockburst” (Elsevier).