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Effect of intermediate principal stress on strength of soft rock under complex stress states

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Abstract

A series of numerical simulations of conventional and true triaxial tests for soft rock materials using the three-dimensional finite difference code FLAC3D were presented. A hexahedral element and a strain hardening/softening constitutive model based on the unified strength theory (UST) were used to simulate both the consolidated-undrained (CU) triaxial and the consolidated-drained (CD) true triaxial tests. Based on the results of the true triaxial tests simulation, the effect of the intermediate principal stress on the strength of soft rock was investigated. Finally, an example of an axial compression test for a hard rock pillar with a soft rock interlayer was analyzed using the two-dimensional finite difference code FLAC. The CD true triaxial test simulations for diatomaceous soft rock suggest the peak and residual strengths increase by 30% when the effect of the intermediate principal stress is taken into account. The axial compression for a rock pillar indicated the peak and residual strengths increase six-fold when the soft rock interlayer approached the vertical and the effect of the intermediate principal stress is taken into account.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, 710048, China

    Zong-yuan Ma  (马宗源) & Fa-ning Dang  (党发宁)

  2. Department of Civil Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Hong-jian Liao  (廖红建)

Authors
  1. Zong-yuan Ma  (马宗源)
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  2. Hong-jian Liao  (廖红建)
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  3. Fa-ning Dang  (党发宁)
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Corresponding author

Correspondence to Zong-yuan Ma  (马宗源).

Additional information

Foundation item: Projects(41172276, 51279155) supported by the National Natural Science Foundation of China; Projects(106-00X101, 106-5X1205) supported by the Central Financial Funds for the Development of Characteristic Key Disciplines in Local University, China

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Ma, Zy., Liao, Hj. & Dang, Fn. Effect of intermediate principal stress on strength of soft rock under complex stress states. J. Cent. South Univ. 21, 1583–1593 (2014). https://doi.org/10.1007/s11771-014-2099-9

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  • DOI: https://doi.org/10.1007/s11771-014-2099-9

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