Research on initiation stress of jointed rock mass under triaxial compression test

Journals

Title：
Research on initiation stress of jointed rock mass under triaxial compression test
Author：
Hang Zhao, Xinping Li, Tingting Liu, Yi Luo
Author Affiliation：
School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China
Received：May.3, 2022
Accepted：May.28, 2023
Published：Jun.6, 2023

Abstract

On the basis of the experimental study about the elastic wave propagation characteristics in jointed rock mass under triaxial compression test, Firstly, the initiation stress is determined by the comparison of the experimental results. After that, on the basis of fracture mechanics theory, the fracture development process of rock mass is studied, and the initiation strength equation of fractured rock mass is established. Finally, combined with experimental data, verification and analysis of the initiation strength equation. Research shows:(1) In intact rock mass, the opening and closing of microscopic cracks have less effect on the amplitude of the elastic wave, but in jointed rock mass, that have great effect on the amplitude of the elastic wave. (2) Under different confining pressures of triaxial compression test, as the cracks in the rock mass start breaking, the axial compressive stress is linear with confining pressure. (3) The initiation strength equation of jointed rock mass is in accordance with the experimental results, the research results have some guidance significance to practical engineering.

Keywords

Elastic wave, triaxial compression, initiation stress, confining pressures.

Doi

https://doi.org/10.58396/cmce020105

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