Anisotropic mechanical properties and brittleness evaluation of layered phyllite

WANG Wei; ZHANG Kuan; CAO Ya-jun; CHEN Chao; ZHU Qi-zhi

doi:10.16285/j.rsm.2022.0702

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Anisotropic mechanical properties and brittleness evaluation of layered phyllite

更新时间：2026-06-25

- Anisotropic mechanical properties and brittleness evaluation of layered phyllite
- Vol. 44, Issue 4, Pages: 975-989(2023)
- 作者机构：
  
  1. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏,南京,210098
  2. 河海大学江苏省岩土工程技术工程研究中心,江苏,南京,210098
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.0702
  CLC： TU45
- Online First：28 April 2023，
  
  Published：2023
- 稿件说明：
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WANG Wei, ZHANG Kuan, CAO Ya-jun, et al. Anisotropic mechanical properties and brittleness evaluation of layered phyllite[J]. 2023, 44(4): 975-989.
DOI：

WANG Wei, ZHANG Kuan, CAO Ya-jun, et al. Anisotropic mechanical properties and brittleness evaluation of layered phyllite[J]. 2023, 44(4): 975-989. DOI： 10.16285/j.rsm.2022.0702.

摘要

为了研究层状千枚岩的力学特性与各向异性特征，开展了不同层理倾角与不同围压下的千枚岩力学试验。对比分析了千枚岩试样强度、变形、脆性与破坏模式等各向异性特征。结果表明：（1）随着层理倾角β 增加，岩样的强度、变形特征曲线形状呈U型；随围压增加，岩样强度及塑性增强，各向异性度逐渐减弱稳定。（2）采用多种强度准则描述岩样强度各向异性，其中Saeidi准则和改进Ramamurthy准则能很好地预测岩样在不同层理倾角下的抗压强度。（3）基于岩样峰前应力−应变曲线与能量特征提出了综合脆性评价指标，在层理倾角β =45º QUOTE

Abstract

In order to study the mechanical properties and anisotropy characteristics of layered phyllite

rock mechanical tests of phyllite were conducted under different bedding inclinations and different confining pressures. The anisotropic mechanical properties in strength

deformation

brittleness and failure modes of phyllite samples were comparatively analyzed. Some findings were as follows. (1) As the bedding inclination increases

the strength and deformation characteristic curve of the rock sample is U-shaped; and the strength and plasticity increase

the anisotropy gradually decreases and stabilizes with the increase of confining pressure. (2) The anisotropic Saeidi criterion and the modified Ramamurthy criterion can well predict the failure strength of rock specimens under different bedding inclinations. (3) A comprehensive brittleness index of phyllite samples at different bedding inclination under different confining pressures is proposed based on the stress–strain curve characteristic and energy equilibrium. The brittleness index is lower

and the shear failure is more likely to occur when the bedding inclination is about 45º. The relationship between brittleness and the failure mode is revealed

and the decreasing order of brittleness is concluded as follows: tensile splitting along bedding plane > tensile splitting through bedding plane > shear along bedding plane > shear through bedding plane. (4) The failure modes of phyllite are related to the bedding inclinations and confining pressures. Under uniaxial compression conditions

complex networks of fractures are formed easily after splitting failure of rock samples; and under high confining pressure conditions

a single shear failure plane is generally formed along the bedding plane or through multiple planes after rock failure.

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