Triaxial Compression Damage Constitutive Model of Transversely Isotropic Slate

  • Jia Jian ,
  • Tao Tiejun ,
  • Tian Xingchao ,
  • Xie Caijin ,
  • Li Guoqing
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  • 1. School of Civil Engineering, Guizhou University, Guiyang 550025, China;
    2. College of Mining, Guizhou University, Guiyang 550025, China

Received date: 2024-06-15

  Online published: 2025-05-06

Abstract

To explore the mechanical properties and damage evolution law of bedded slate under a triaxial compression load. The slate with apparent bedding structural plane is a composite rock mass formed by a series of connections of common plane closing element and shear deformation element of rock block containing microscopic defects. Considering the influence of closure of bedding structural plane and shear slip deformation on axial deformation of bedding rock specimen, the damage constitutive model of bedding slate under triaxial compression load is given, and the accuracy of the damage constitutive model is verified by triaxial compression test. The results show that the establishment of the damage constitutive model can accurately describe the compaction section and elastic section of the stress-strain curve of bedding slate ;When the bedding dip angle changes from 0° to 90°, the strength and deformation capacity of the bedding slate show a U-shaped distribution as a whole, and the minimum value appears at 60°; With the increase of dip angle, the failure type develops from tensile-shear composite failure to shear-slip failure, and it is splitting tensile failure at 90°; The damage evolution curve shows an overall S-shaped distribution law.

Cite this article

Jia Jian , Tao Tiejun , Tian Xingchao , Xie Caijin , Li Guoqing . Triaxial Compression Damage Constitutive Model of Transversely Isotropic Slate[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(2) : 393 -402 . DOI: 10.20174/j.JUSE.2025.02.04

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