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单轴压缩下节理化千枚岩裂纹演化规律及宏观破坏模式研究

Research on crack evolution law and macroscopic failure mode of joint Phyllite under uniaxial compression.

作者信息

Xu Jiangbo, Fei Dongyang, Yu Yanglin, Cui Yilun, Yan Changgen, Bao Han, Lan Hengxing

机构信息

School of Highway, Chang'an University, Xi'an, 710064, Shaanxi, China.

Gansu Province Water Conservancy and Hydropower Survey and Design Institute Co. LTD, Lanzhou, 730000, Gansu, China.

出版信息

Sci Rep. 2021 Feb 18;11(1):4196. doi: 10.1038/s41598-021-83571-9.

DOI:10.1038/s41598-021-83571-9
PMID:33603044
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7892870/
Abstract

In order to explore the fracture mechanism of jointed Phyllite, the TAJW-2000 rock mechanics test system is used to carry out uniaxial compression tests on different joint inclination Phyllites. The influence of joint inclination of Phyllite failure mode is discussed, and the progressive failure process of Phyllite is studied. The test results show that the uniaxial compressive strength anisotropy of jointed Phyllite is remarkable. As the inclination increases, it exhibits a U-shaped change; When 30° ≤ α ≤ 75°, the tensile and shear failures along the joint inclination mainly occurs. the joint inclination controls the failure surface form of the Phyllite; The crack initial stress level of the joint Phyllite is 0.30-0.59σf, the crack failure stress level is 0.44-0.86σf. When α = 90°, the σ value is the largest, and σ with α = 90° can be used as the maximum reliable value of uniaxial compressive strength of Phyllite. Using the theory of fracture mechanics, it is analyzed that under uniaxial compression of the rock, the crack does not break along the original crack direction, but extends along the direction at a certain angle to the original crack. The joint effect coefficient is proposed to show the influence of the joint inclination on the uniaxial compressive strength of the phyllite. Both the test and simulation results show that when the joint inclination is 60°, the joint effect coefficient is the largest. The compressive strength is the smallest. Numerical simulation analyses the crack evolution law of phyllite under different joint inclination under uniaxial compression, which verifies that there are different failure modes of joint phyllite under uniaxial compression.

摘要

为探究节理化千枚岩的断裂机制，利用TAJW - 2000岩石力学试验系统对不同节理倾角的千枚岩进行单轴压缩试验。探讨了节理倾角对千枚岩破坏模式的影响，研究了千枚岩的渐进破坏过程。试验结果表明，节理化千枚岩的单轴抗压强度各向异性显著。随倾角增大呈U形变化；当30°≤α≤75°时，主要沿节理倾角发生拉剪破坏，节理倾角控制着千枚岩的破坏面形态；节理化千枚岩的裂纹起裂应力水平为0.30 - 0.59σf，裂纹破坏应力水平为0.44 - 0.86σf。当α = 90°时，σ值最大，α = 90°时的σ可作为千枚岩单轴抗压强度的最大可靠值。利用断裂力学理论分析了岩石单轴压缩下裂纹不沿原裂纹方向破裂，而是沿与原裂纹呈一定角度的方向扩展。提出节理效应系数来表征节理倾角对千枚岩单轴抗压强度的影响。试验和模拟结果均表明，节理倾角为60°时，节理效应系数最大，抗压强度最小。数值模拟分析了单轴压缩下不同节理倾角千枚岩的裂纹扩展规律，验证了节理化千枚岩在单轴压缩下存在不同的破坏模式。

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