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Experiments on failure process of new rock-like specimens with two internal cracks under biaxial loading and the 3-D simulation

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Abstract

A new resin material has been developed by massive formula exploration. The resin is thoroughly transparent and rock-like at low temperatures. Its tension–compression strength ratio is up to 1/6.6 in the temperature range of − 10 to − 15 °C. It can simulate quite a few kinds of engineering rocks. Specimens have been made with two internal cracks. The progressive failures under uniaxial and biaxial compressions are systematically studied. The uniaxial failure process is divided into four stages as conventional rock mechanics test. Several forms of secondary cracks, like anti-wing cracks in the biaxial experiment with high lateral pressure, have seldom been described by former scholars. Three-dimensional numerical simulation has been conducted using FLAC3D. A novel elastic-brittle constitutive model is developed and programed. Superfine mesh generation is demanded as well. Both uniaxial and biaxial results of the new numerical approach show excellent consistency with experimental results in this paper.

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Abbreviations

D 1, D 2, …, D 5 :

Damage factors

K :

Bulk modulus

G :

Shear modulus

σ t :

Tensile strength

c :

Cohesion

φ :

Internal friction angle

K′:

Bulk modulus of post-failure elements

G′:

Shear modulus of post-failure elements

σ t′:

Tensile strength of post-failure elements

c′:

Cohesion of post-failure elements

φ′:

Internal friction angle of post-failure elements

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Acknowledgements

The authors express sincere appreciation to anonymous reviewers for their valuable comments on improving this study. The study is jointly supported by grants from the National Natural Science Foundation of China (Grant Nos. 51608117 and 51708214), State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (SKLGDUEK1812), and National High-tech R&D Program of China (863 Program) 2012AA041802.

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Authors and Affiliations

  1. School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China

    Jin-Wei Fu

  2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221116, China

    Jin-Wei Fu

  3. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou, 450001, China

    Jin-Wei Fu & Zhen-chuan Sun

  4. School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China

    Shu-Li Liu

  5. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, China

    Wei-Shen Zhu

  6. Jinan Rail Transit Group Co., Ltd, Jinan, 250101, China

    Hao Zhou

Authors
  1. Jin-Wei Fu
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  2. Shu-Li Liu
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  3. Wei-Shen Zhu
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  4. Hao Zhou
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  5. Zhen-chuan Sun
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Correspondence to Jin-Wei Fu.

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Fu, JW., Liu, SL., Zhu, WS. et al. Experiments on failure process of new rock-like specimens with two internal cracks under biaxial loading and the 3-D simulation. Acta Geotech. 13, 853–867 (2018). https://doi.org/10.1007/s11440-018-0651-8

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  • DOI: https://doi.org/10.1007/s11440-018-0651-8

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