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Mechanical Anisotropy of the Columnar Jointed Rock Mass Under Unloading Conditions

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Soil Mechanics and Foundation Engineering Aims and scope

The mechanical properties of a columnar jointed rock mass (CJRM) under loading and unloading conditions differ appreciably. The CJRM at the Baihetan Hydropower Station has a distinct type of joint and a self-organized joint network of discontinuities. Under an unloading condition during excavation, the joints present a characteristic anisotropy phenomenon. To study the relationship between the strength and deformation of the CJRM, a series of triaxial unloading tests were conducted on the CJRM physical model with a servo-controlled testing machine. The results indicate that the deformation has an obvious correlation with the angle β between the column direction and horizontal. Poisson’s ratio of the CJRM varies with β between 0.07 and 0.42 during the loading of axial stress. Furthermore, the relation between the confining pressure reduction and deformation modulus reduction of the CJRM as a function of β was studied.

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Authors and Affiliations

  1. College of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou, China

    Z. Lin & S. Feng

  2. Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing, China

    Z. Lin, W. Xu & Y. Li

Authors
  1. Z. Lin
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  2. S. Feng
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  3. W. Xu
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  4. Y. Li
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Correspondence to Z. Lin.

Additional information

Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 1, January-February, 2023.

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Lin, Z., Feng, S., Xu, W. et al. Mechanical Anisotropy of the Columnar Jointed Rock Mass Under Unloading Conditions. Soil Mech Found Eng 60, 70–78 (2023). https://doi.org/10.1007/s11204-023-09865-4

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  • DOI: https://doi.org/10.1007/s11204-023-09865-4

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