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作者:

Chu, Zhaofei (Chu, Zhaofei.) | Wu, Zhijun (Wu, Zhijun.) | Wang, Zhiyang (Wang, Zhiyang.) | Weng, Lei (Weng, Lei.) | Liu, Quansheng (Liu, Quansheng.) | Fan, Lifeng (Fan, Lifeng.)

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摘要:

Understanding the micro-mechanism of brittle creep in saturated rocks and studying their mechanical behaviors after creep damage are of great significance to the design of rock engineering and the prediction of the long-term evolution of the Earth's crust. In this study, we first performed a series of uniaxial creep tests with different creep stage cut-offs on saturated intact sandstones. The brittle creep mechanism of the specimens was explored microscopically by analyzing P-wave velocity, acoustic emission (AE), and nuclear magnetic resonance (NMR) measurements. Then, specimens with different degrees of creep damage were subjected to a secondary shortterm loading test or creep test, and their short- and long-term mechanical behaviors, together with AE monitoring, were systematically investigated. The experimental results show that (1) the anisotropy of the specimens increases significantly during creep, with the axial and lateral P-wave velocities exhibiting a difference of 30% at the onset of tertiary creep. (2) The tensile cracks dominate the transient creep stage and the early part of the steady creep stage, while the shear cracks dominate thereafter. (3) The porosities of the specimens increase with the loading stages, and the porosity increments corresponding to small pores are greater than those corresponding to large pores, for all creep stages. (4) Specimens with different degrees of creep damage show greater deformability, and their short-term and creep mechanical parameters, except for uniaxial strength, change dramatically. (5) The AE characteristics of creep-damaged specimens differ significantly from those of intact specimens, and the Kaiser stress memory effect was observed during reloading, with the memory stress being the previous creep stress.

关键词:

Saturated sandstone P-wave velocity Micro-mechanism Acoustic emission Nuclear magnetic resonance Creep test Brittle creep Creep damage

作者机构:

  • [ 1 ] [Chu, Zhaofei]Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
  • [ 2 ] [Wu, Zhijun]Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
  • [ 3 ] [Wang, Zhiyang]Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
  • [ 4 ] [Weng, Lei]Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
  • [ 5 ] [Liu, Quansheng]Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
  • [ 6 ] [Fan, Lifeng]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China

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来源 :

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

ISSN: 1365-1609

年份: 2021

卷: 149

7 . 2 0 0

JCR@2022

ESI学科: GEOSCIENCES;

ESI高被引阀值:64

JCR分区:1

被引次数:

WoS核心集被引频次: 47

SCOPUS被引频次: 51

ESI高被引论文在榜: 0 展开所有

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中文被引频次:

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